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Chemistry is a branch of science which is defined as the study of matter and energy, along with their physical and chemical properties, their spatial geometry, and their composition. It describes why certain object breaks while other may not when dropped from a same height. Chemistry is the logic behind the behaviour of various elements or compounds in different conditions. For instancewhy only iron gets rusted and why not carbon? Or why not all pain relievers work equally well on a headache? Hence sound knowledge in chemistry helps to understand the world better.

Chemistry is present in every aspect of life. It relates us to nature. Through this we can save as well as make our environment to grow in a sustainable way. Being the central science, it connects biology, geology and physics. Chemistry is divided into five main branches namely organic, analytical, biochemistry, inorganic, and physical. Over the years branches like nuclear, environmental, polymer chemistry emerged as a separate branch.

Organic chemistry deals with structure and behaviour of molecules required by all life forms for their survival. Analytical or stoichiometry deals with the identification and quantitative analysis of material in the mixture. Reaction kinetic, surface and electrochemistry, dynamics of equilibrium, thermodynamics and the quantum mechanics falls in the category of the physical chemistry. Biochemistry includes study of pharmacology related subjects like regenerative medicine; organ transplantation etc. inorganic chemistry is study of compounds other than hydrocarbons.

ProfsOnly provides online chemistry assignments papers and homework help in all areas of chemistry. We have the best tutors who are certified experts and are well trained and experienced in all branches of chemistry. The assignments are very carefully prepared to test students in terms of their knowledge about the subject.

  • (Choose any article you want) Find an article that discusses, and explains the function that carbohydrates, proteins, and sometimes
    (Choose any article you want)
    Find an article that discusses, and explains the function that carbohydrates, proteins, and sometimes fats have on how good bacteria help to maintain gut health in humans.

    The final draft should adhere to the guides outlined within the essay directions. Minimum word length for your essay is 900 words. A large number of points for this essay relate to your summary

    Column Chromatography Lab Report

    There is video that you need to watch. You need to write an introduction accordingly to the video. There should also be a conclusion. I will provide the recitation and the lab manual. You need to log into the school portal and watch the recitaion and the video under the tab of Column Chromatography Lab .

    The writer should list/mention the different cosmetics (fragments and etc). What chemicals could be in it? For example, the Essay

    Chemistry Assignment Help The writer should list/mention the different cosmetics (fragments and etc). What chemicals could be in it? For example, the diethyl ester of phthalic acid (DEP) in the fragment. How it will affect the human body or skin. Also, some companies mentioned against animal test (the body shop) and it influence.

    This article could be helpful: Toxicological profile of diethyl phthalate: a vehicle for fragrance and cosmetic ingredients

    write a full lab report introduction, method, result, discussion and conclusion, it has to be well written no plagiarism Essay

    write a full lab report introduction, method, result, discussion and conclusion, it has to be well written no plagiarism for PHD level, we had one unknown sample and 3 known samples, I uploaded the instruction and lecture about it, so you understand the results is attached as well, you have to look up the functional groups of the results, the unknown is Aspirin
  • Lab Analysis
    Like the speed of a car, a rate is always a positive number. permanganate concentration would be written:
    − = rate
    Δ 4[KMnO ]
    Δ t
    Therefore, the rate based on the potassium
    Eqn. 1
    Here Δ[KMnO4] represents the change in potassium permanganate concentration during the time interval Δt. Since the concentration decreases, the minus sign is needed to make the rate come out positive.
    The rate law expression gives the dependence of the reaction rate on the concentration of reactants. For the reaction under investigation, we write the rate law as
    rate = k[KMnO4]X[H2C2O4]Y
    Eqn. 2
    where the [ ] indicates molarity (moles/L), and X and Y are called the orders with respect to potassium permanganate (X) and oxalic acid (Y), respectively. The values of X and Y are not always integers; they are often fractions or decimal numbers.
    The overall rate order would be “X Y”.
    Finally, the constant, k, is
    called the rate constant for the reaction and it is a constant at any one temperature. Suppose we do two experiments, keeping the potassium permanganate concentration constant for both, [KMnO4l1, but varying the oxalic acid concentration, [H2C2O4]1 and [H2C2O4]2. We could write two rate expressions now:
    By reversing the process (varying the concentration of KMnO4 and keeping the concentration of H2C2O4 constant), we can find the value of X.
    Then we can solve for the overall rate order, X Y.
    constant, k, can be determined by substituting X and Y into the rate expression in Eqn. 2.
    The rate
    _________________________________________________________________________________
    Precautions:
    * You MUST wear safety goggles and a lab coat at all times while in the laboratory.
    * It is always a good idea to:
    wash your hands well if in contact with chemicals
    change gloves when they start degrading or get torn
    wash your lab bench well to remove any spills
    * All solutions should be placed in the aqueous waste beaker in the waste hood unless they contain only water or you are specifically told in the manual procedures that it is okay to rinse them down the drain. DO NOT PUT ANYTHING INTO THE BIG WASTE JUG.
    * Pipets should be used only with bulbs or pumps. NO PIPETING BY MOUTH.
    * All normal safety rules must be obeyed, including any special precautions issued by your instructor.
    * KMnO4 (potassium permanganate) stains skin and clothes, the purple color changes to dark brown. It will wear off the skin with normal washing, but will cause a permanent stain on clothing.
    _____________________________________________________________________________
    Procedure:
    Using 3 clean small, labelled beakers and a graduated cylinder, obtain the following:
    ● ~ 50 mL of distilled water
    ● ~ 20 mL of 0.130 M KMnO4
    ● ~ 70 mL of 0.755 M H2C2O4
    ●. A 6×6 plastic, red test tube rack
    A. Record the temperature of the lab in °C into your lab notebook.
    The solutions in step A will be used to prepare the concentration series for the experiments. A table of the solution combinations is given below. The subsequent procedure describes how the solutions are to be mixed.
    Table : 1
    ReactantsExperiment #1Experiment #2Experiment #3distilled water6.00 mL1.00 mL5.00 mL0.130M KMnO41.00 mL1.00 mL2.00 mL0.755 M H2C2O45.00 mL10.00 mL5.00 mLTotal Volume12.00 mL12.00 mL12.00 mL[KMnO4], M0.01080.01080.0217[H2C2O4], M0.3140.6290.315Determination #1: Calculate the molarity of KMnO4 and H2C2O4 for each set-up in Table 1.
    Example: (Experiment #1 Column)
    (0.130 M KMnO 4 )(1.00 mL KMnO 4 ) 12.00 mL solution
    = 0.0108 M
    **Use a similar approach for the oxalic acid concentration.
    Using disposable pipets measure 6.00 mL of distilled water and 5.00 mL of oxalic acid into a clamped test tube equipped with a magnetic rice grain stir bar and stirring.
    One partner should measure 1.00 mL of potassium permanganate and prepare to add it to the test tube. Thether partner should be ready to start the timer when the permanganate is added.

    solution will change color from purple to red to yellow. disappears from the solution.
    Stir immediately.
    The
    Record the time when the red completely
    Dispose of the test tube contents in the designated beaker located in the hood. Obtain a new, clean and dry the test tube and repeat steps (C) and (D), rotating duties of the partners, for a total of 3 trials.
    Repeat steps (C) and (D) for the amounts in both the Experiment #2 and the Experiment #3 columns and record the data into your lab notebook.
    Lab Report Format
    Purpose Section:
    What was the overall point of doing this lab? Go through each part and briefly describe what you did, why you did it and how you did it. Be specific and don’t just copy the objective in the lab manual that will not accrue any points.
    Procedure Section:
    ‘Followed the experimental procedure as per the laboratory manual’
    Then follow that with any variations that were made to the procedure.
    Data Section:
    Don’t forget to include all units. In tables, the units belong in the heading in parentheses, not after every single number in the table for that row.
    The data tables for this lab are listed below.
    DON’T FORGET SIG FIGS!
    These should be reproduced in both your notebook and in your written lab report.
    Table : 2
    T =oC__25___
    Trial[KMnO4](M)[H2C2O4](M)time (s)Rate1 = [KMnO4]/time10.01080.314287.410.000037620.01080.314318.440.000033930.01080.314282.310.0000383
    Average Rate ____________________
    Standard dev. ____________________
    95% conf., λ ____________________
    Table : 3
    T =oC __25___
    Trial[KMnO4] (M)[H2C2O4](M)time (s)Rate2 = [KMnO4]/time10.0108 0.629200.470.000053920.01080.629195.000.000055430.01080.629191.080.0000565
    Average Rate ____________________
    Standard dev. ____________________
    95% conf., λ ____________________
    Table : 4
    T =oC__25___
    Trial[KMnO4](M)[H2C2O4](M)time (s)Rate3 = [KMnO4]/time10.02170.315268.320.000080920.02170.315256.000.000084830.02170.315328.640.0000660Average Rate ____________________
    Standard dev. ____________________
    95% conf., λ ____________________
    Determination of Reaction Order:
    The results from the various pairs of experiments will now be combined to find X and Y. The conditions for Experiments #1 and #2 differ by the oxalic acid concentration, [H2C2O4]. We can therefore use Eqn. 4 to give the reaction order with respect oxalic acid:
    Reaction Order Data:
    Reaction Order X (rounded to nearest 10th) Reaction Order Y (rounded to nearest 10th) Overall Order of Reaction X Y Rate constant, k (with proper units)
    ________________
    ________________
    ________________
    ________________
    Results

    intermediate metabolism

    homework
    1) The concentrations of ATP, ADP, and AMP in a particular rat hepatocyte cell are 3.38 mM, 1.32 mM, and 0.29 mM, respectively. Using the information you used in problem 9, calculate the Gibbs Free Energy (?G) for the reaction
    ATP AMP ? 2 ADP
    under these conditions at 37°C. Give your answer in kJ/mol to one decimal (tenths) without units.
    2) Given the the standard reduction potentials for cystine disulfide and NAD on Table 1 below, calculate the standard state reduction potential for the chemical reaction that follows. Give your answer in Volts to three decimals (thousandths) and do not include units.
    Table 1. Standard Reduction Potentials of Some Biochemically Important Half-Reactions
    Half-Reaction
    ??°’ (V)
    NAD H 2e- ? NADH
    -0.315
    Cystine disulfide 2H 2e- ? 2 Cysteine
    -0.340
    Cystine disulfide NADH H ? 2 Cysteine NAD
    3) A healthy cell produces ATP continuously. However, ATP is only one of four ribonucleoside triphosphates (together with CTP, GTP, and UTP) required in roughly equal amounts for synthesis of all the RNA in a cell (and there is a lot of RNA in a cell!). Which enzyme is responsible for maintaining the roughly equal cellular concentrations of the four ribonucleoside triphosphates?
    a) Inorganic pyrophosphatase
    b)Ribonuclease
    c) Nucleoside diphosphate kinase
    d) Chymotrypsin

    4)Draw a schematic diagram for the steps leading up to the removal of two electrons from glyceraldehyde-3-phosphate to NAD by the enzyme GAP dehydrogenase. How does this dehydrogenation differ from similar reactions catalyzed by lactate dehydrogenase or yeast alcohol dehydrogenase. What is the advantage of using the mechanism of GAP dehydrogenase? (HINT: think of the role played by Pi in the GAP dehydrogenase enzyme mechanism

    5) Use the half reaction reduction potentials found on Table 14-4 to calculate the standard state Gibb’s Free Energy (?G°’) for the reaction: (picture attached of chart)
    Pyruvate NADH H ? Lactate NAD
    If the steady state cellular concentrations of Pyruvate and Lactate are held fixed at 0.051 mM and 0.51 mM, respectively, then what is the ratio of [NAD ]/[NADH] below which this reaction begins to be energetically favorable at 37°C? Note that for this reaction the H ions are immediately buffered by proteins, metabolites, other small molecules, and even water in the cell cytoplasm so, effectively, they are available as needed and “disappear” as soon as they are produced. Therefore, you need not include the [H ] in your free energy calculations
    6) Neatly create a diagram that shows each of the ten steps in glycolysis. Include the structures and names of each of the stable intermediates, the names of each of the enzymes, and the co-factors (ATP, NAD ) required and generated in the pathway.

    Chemistry Discussion

    Chemistry Assignment Help Humans have engaged in psychoactive drug use, sometimes in formal (ceremonial) settings and sometimes recreationally, since before recorded history. It has only been in the last century or so that abuse and addiction have become large-scale problems. Using the literature and your own insights into these issues, formulate an argument as to why the problem has reached its current scale. In your discussion, evaluate the employment of psychoactive drugs from the aspects of a risk-benefits analysis and ethical considerations such as the risk of addiction versus the cost of punitive action. Also explain purely pharmacological issues such as pharmacokinetics and routes of drug administration and dose. If needed, include factors such as supply, cultural attitudes to drug use, and the context of drug use.

    Lab Analysis

    Like the speed of a car, a rate is always a positive number. permanganate concentration would be written:
    ? = rate
    ? 4[KMnO ]
    ? t
    Therefore, the rate based on the potassium
    Eqn. 1
    Here ?[KMnO4] represents the change in potassium permanganate concentration during the time interval ?t. Since the concentration decreases, the minus sign is needed to make the rate come out positive.
    The rate law expression gives the dependence of the reaction rate on the concentration of reactants. For the reaction under investigation, we write the rate law as
    rate = k[KMnO4]X[H2C2O4]Y
    Eqn. 2
    where the [ ] indicates molarity (moles/L), and X and Y are called the orders with respect to potassium permanganate (X) and oxalic acid (Y), respectively. The values of X and Y are not always integers; they are often fractions or decimal numbers.
    The overall rate order would be “X Y”.
    Finally, the constant, k, is
    called the rate constant for the reaction and it is a constant at any one temperature. Suppose we do two experiments, keeping the potassium permanganate concentration constant for both, [KMnO4l1, but varying the oxalic acid concentration, [H2C2O4]1 and [H2C2O4]2. We could write two rate expressions now:
    By reversing the process (varying the concentration of KMnO4 and keeping the concentration of H2C2O4 constant), we can find the value of X.
    Then we can solve for the overall rate order, X Y.
    constant, k, can be determined by substituting X and Y into the rate expression in Eqn. 2.
    The rate
    _________________________________________________________________________________
    Precautions:
    * You MUST wear safety goggles and a lab coat at all times while in the laboratory.
    * It is always a good idea to:
    wash your hands well if in contact with chemicals
    change gloves when they start degrading or get torn
    wash your lab bench well to remove any spills
    * All solutions should be placed in the aqueous waste beaker in the waste hood unless they contain only water or you are specifically told in the manual procedures that it is okay to rinse them down the drain. DO NOT PUT ANYTHING INTO THE BIG WASTE JUG.
    * Pipets should be used only with bulbs or pumps. NO PIPETING BY MOUTH.
    * All normal safety rules must be obeyed, including any special precautions issued by your instructor.
    * KMnO4 (potassium permanganate) stains skin and clothes, the purple color changes to dark brown. It will wear off the skin with normal washing, but will cause a permanent stain on clothing.
    _____________________________________________________________________________
    Procedure:
    Using 3 clean small, labelled beakers and a graduated cylinder, obtain the following:
    ? ~ 50 mL of distilled water
    ? ~ 20 mL of 0.130 M KMnO4
    ? ~ 70 mL of 0.755 M H2C2O4
    ?. A 6×6 plastic, red test tube rack
    A. Record the temperature of the lab in °C into your lab notebook.
    The solutions in step A will be used to prepare the concentration series for the experiments. A table of the solution combinations is given below. The subsequent procedure describes how the solutions are to be mixed.
    Table : 1
    ReactantsExperiment #1Experiment #2Experiment #3distilled water6.00 mL1.00 mL5.00 mL0.130M KMnO41.00 mL1.00 mL2.00 mL0.755 M H2C2O45.00 mL10.00 mL5.00 mLTotal Volume12.00 mL12.00 mL12.00 mL[KMnO4], M0.01080.01080.0217[H2C2O4], M0.3140.6290.315Determination #1: Calculate the molarity of KMnO4 and H2C2O4 for each set-up in Table 1.
    Example: (Experiment #1 Column)
    (0.130 M KMnO 4 )(1.00 mL KMnO 4 ) 12.00 mL solution
    = 0.0108 M
    **Use a similar approach for the oxalic acid concentration.
    Using disposable pipets measure 6.00 mL of distilled water and 5.00 mL of oxalic acid into a clamped test tube equipped with a magnetic rice grain stir bar and stirring.
    One partner should measure 1.00 mL of potassium permanganate and prepare to add it to the test tube. Thether partner should be ready to start the timer when the permanganate is added.

    solution will change color from purple to red to yellow. disappears from the solution.
    Stir immediately.
    The
    Record the time when the red completely
    Dispose of the test tube contents in the designated beaker located in the hood. Obtain a new, clean and dry the test tube and repeat steps (C) and (D), rotating duties of the partners, for a total of 3 trials.
    Repeat steps (C) and (D) for the amounts in both the Experiment #2 and the Experiment #3 columns and record the data into your lab notebook.
    Lab Report Format
    Purpose Section:
    What was the overall point of doing this lab? Go through each part and briefly describe what you did, why you did it and how you did it. Be specific and don’t just copy the objective in the lab manual that will not accrue any points.
    Procedure Section:
    ‘Followed the experimental procedure as per the laboratory manual’
    Then follow that with any variations that were made to the procedure.
    Data Section:
    Don’t forget to include all units. In tables, the units belong in the heading in parentheses, not after every single number in the table for that row.
    The data tables for this lab are listed below.
    DON’T FORGET SIG FIGS!
    These should be reproduced in both your notebook and in your written lab report.
    Table : 2
    T =oC__25___
    Trial[KMnO4](M)[H2C2O4](M)time (s)Rate1 = [KMnO4]/time10.01080.314287.410.000037620.01080.314318.440.000033930.01080.314282.310.0000383
    Average Rate ____________________
    Standard dev. ____________________
    95% conf., ? ____________________
    Table : 3
    T =oC __25___
    Trial[KMnO4] (M)[H2C2O4](M)time (s)Rate2 = [KMnO4]/time10.0108 0.629200.470.000053920.01080.629195.000.000055430.01080.629191.080.0000565
    Average Rate ____________________
    Standard dev. ____________________
    95% conf., ? ____________________
    Table : 4
    T =oC__25___
    Trial[KMnO4](M)[H2C2O4](M)time (s)Rate3 = [KMnO4]/time10.02170.315268.320.000080920.02170.315256.000.000084830.02170.315328.640.0000660Average Rate ____________________
    Standard dev. ____________________
    95% conf., ? ____________________
    Determination of Reaction Order:
    The results from the various pairs of experiments will now be combined to find X and Y. The conditions for Experiments #1 and #2 differ by the oxalic acid concentration, [H2C2O4]. We can therefore use Eqn. 4 to give the reaction order with respect oxalic acid:
    Reaction Order Data:
    Reaction Order X (rounded to nearest 10th) Reaction Order Y (rounded to nearest 10th) Overall Order of Reaction X Y Rate constant, k (with proper units)
    ________________
    ________________
    ________________
    ________________
    Results

  • Fluid mechanics. I have to use the fomula of process fkuid flow
    The figure below describes the flow of a thin layer of biodiesel on an inclined, wide plate at a certain velocity. If h = 25 10-3 ft. and  = 0.35 rad, compute the surface velocity, U. Bear in mind that at equilibrium the component of weight acting parallel to the plate surface must be balanced by the shearing force developed along the plate surface. In your analysis assume a unit plate width. Can you please show me the answeanswers with Clear calculations please

    chem 1 discussion board

    This week, consider the following terms:
    Chemical symbol
    Atomic theory
    Ion
    Mass
    Isotope
    Respond to the following in a minimum of 175 words:
    Choose at least 2 terms from the list, and answer the following questions for each term:
    What familiarity and prior knowledge do you have about the term?
    What does the term mean in everyday language to everyday people? Use examples to help describe your thoughts. How do people use the word?
    What does the term mean in technical language to chemists?
    How is the term related to the course student learning outcome: Explain matter at the microscopic level?
    What are the similarities and differences between the everyday and technical meanings and uses of the term?
    What impact might the similarities and differences have on your learning of chemistry concepts in this course?

    Limiting a Chemical reaction

    Chemistry Assignment Help 2NH3 MgSO4 2H2O ? Mg(OH)2 (NH4)2SO4.
    Part A
    Look at the three bottles. What evidence is there that a chemical reaction took place?
    Part B
    Compare bottles 1 and 2. How do the amounts of the reactants compare? How do the amounts of the products compare? For these two bottles, does the amount of product appear to be proportional to the amount of ammonia used?
    Part C
    Compare bottles 2 and 3. How do the amounts of the reactants compare? How do the amounts of the products compare? For these two bottles, does the amount of product appear to be proportional to the amount of ammonia used?
    Part D
    Compare your answers in parts B and C. If your answers to those questions are different, explain why they’re different.
    Part E
    Imagine mixing 1 tablespoon of Epsom salt with 2 cups of ammonia. How much precipitate would be produced? Describe the amount of precipitate by comparing it with the amount in bottle 1, 2, or 3. Explain your prediction.

    Chemistry Question

    This week’s lab reinforced your learning of the names and properties of basic subatomic particles, as well as how changing the number of electrons may charge an atom positively or negatively. You were also teleported to another planet, where you collected samples of elements to investigate in the lab to make observations about the presence of life on the planet.
    Quizlet with all questions asked in virtual Lab: https://quizlet.com/583360880/lab-assignment-5-atomic-structure-flash-cards/#:~:text=My advanced analytical machinery has,after consulting the periodic table?

  • Chemistry question
    Hello,
    I need help with this table. Please fill in the table based on the IR graph. Please make sure you find the functional groups as well. label on the graph. Finally, draw the molecular compound structure and list the name. Note that the name is unknown and we have to find it!
    The table should have: The wavenumber Intensity (medium or strong) Functional group name

    pre-lab.

    Pre labs should consist of purpose of the lab, procedure and data tables.
    so it is a pre-lab read it then write the purpose of the lab, procedure and data tables
    should be in your own word so do not just copy the procedure

    write a full lab report with all section introduction, methods, result and discussion, my lab partner Andrew, first we

    Chemistry Assignment Help write a full lab report with all section introduction, methods, result and discussion, my lab partner Andrew, first we observed one bill and one capsule, then thin layer chromatography (TLC) we looked under uv light nothing appeared then we sprayed ninhydrin, please read all attachment and add the pictures of results

    pre-lab.

    Pre labs should consist of purpose of the lab, procedure and data tables.
    so it is a pre-lab read it then write the purpose of the lab, procedure and data tables
    should be in your own word so do not just copy the procedure

  • I need answers for post lap questions experimental and report sheet for experimental 4. pre lap for experimental 5
    I need you to answer carefully the post lab questions for experiment 4 that I will upload in the file and also the one report sheet for experiment 4 that also will provide in the file and please explain all the steps in the report sheet and write the formula from line 1 to 9 also I want you to answer the pre-lab questions for experiment 5 .
    Please do all that by typing not hand written

    chemistry about (gases, liquids,solids )

    Students are required to find a news article and write a short paper (400-600 words) explaining the article subject using chemistry terms/concepts discussed and learned in this course. This assignment is NOT to simply write a summary of an article. Be EXTREMELY CAREFUL to NOT plagiarize the article. The complete article, or web address of the article, must be included within the submitted paper Word document file. Only Word formats (.doc or .docx) are acceptable. Late submissions will NOT be accepted and will result in zero points for this assignment.

    CHEM110 – M01 Experiment: Measurement and Significant Figures (HOL)

    Chemistry Assignment Help Submission RequirementsYou will create a formal lab report using a digital word processing program (Microsoft Word, Google Docs, etc.) and submit it as a PDF within this assignment page.
    All lab reports will be organized into three sections:
    Design
    Title and Purpose
    Methodology: Explain the procedure in your own words. What are you doing to achieve the experiment’s purpose?
    Pre-Lab Questions: These are asked in the “Lab Workbook”. Answer in complete sentences.
    Results
    Observations: Take 2-3 photos of your at-home experiment at crucial points in the procedure and embed them into the digital report. Provide a description of any observations.
    Data Tables and Graphs (if applicable): Create digitally, within a word processing or spreadsheet application.
    Calculations: Complete all calculations by hand, take photos, and embed them into the digital report. If calculations are involved in the experiment, then they must be provided in this section.
    Discussion
    Analysis: Explain the point of the lab in your own words. Address the lab’s “Purpose” thoroughly, citing and connecting two main sources: your experimental results and your course content.
    Post-Lab Questions: These are asked in the “Lab Workbook”. Answer in complete sentences
    Chem 110 Lab Rubric
    CriteriaRatingsPtsThis criterion is linked to a Learning OutcomeDesign5 ptsFull Marks3 ptsPartial Marks0 ptsNo Marks5 ptsThis criterion is linked to a Learning OutcomeResults5 ptsFull Marks3 ptsPartial Marks0 ptsNo Marks5 ptsThis criterion is linked to a Learning OutcomeDiscussion5 ptsFull Marks3 ptsPartial Marks0 ptsNo Marks5 ptsTotal Points: 15

    Intermediary Metabolism- chem 562

    ANSWER FOLLOWING QUESTIONS MULTIPLE CHOICE
    1) Which of the following is not a true statement regarding metabolic pathways?
    a) Metabolic pathways can be regulated genetically by altering expression levels of enzymes in the pathway.
    b) Metabolic pathways can be regulated allosterically by small molecule products of the pathway.
    c)Metabolic pathways can be regulated covalently by transient modification or complete proteolysis of enzymes in the pathway.
    d)Biosynthetic pathways are identical to breakdown pathways but run in reverse.

    2)Mg2 is requirement of all protein kinase enzymes. Which statement below best describes the role played by Mg2 in a typical kinase enzyme-catalyzed reaction?
    a)Mg2 is a metal ion co-factor that is required for the enzyme-catalyzed reaction to occur.
    b)Mg2 is a co-substrate co-factor that is required for the enzyme-catalyzed reaction to occur.
    c)Mg2 is the substrate that is converted into product during the enzyme-catalyzed reactiond) Mg2 is a vitamin co-factor that is required for the enzyme-catalyzed reaction to occur.
    e)Mg2 is a prosthetic group co-factor that is required for the enzyme-catalyzed reaction to occur.
    3) picture attached (#4 in the pic)
    4)Given the the standard reduction potentials for cystine disulfide and NAD on Table 1 below, calculate the standard state reduction potential for the chemical reaction that follows. Give your answer in Volts to three decimals (thousandths) and do not include units.
    Table 1. Standard Reduction Potentials of Some Biochemically Important Half-Reactions
    Half-Reaction
    ??°’ (V)
    NAD H 2e- ? NADH
    -0.315
    Cystine disulfide 2H 2e-? 2 Cysteine
    -0.340
    Cystine disulfide NADH H ? 2 Cysteine NAD
    5)Consider the chemical reaction:
    ATP AMP ? 2 ADP
    Using data in the Table 1 below, calculate the standard state Gibbs Free Energy (?G°’) for this reaction. Give your answer in kJ/mol to one decimal (tenths) without units.
    Table 1. Standard Free Energies of Phosphate Hydrolysis for Some Compounds of Biological Interest
    Compound
    ?G°’ (kJ/mol)
    ATP (? ADP Pi)
    -30.5
    ADP (? AMP Pi)
    -32.8
    6) What is the name of the enzyme that catalyzes the reaction:
    ATP AMP ? 2 ADP
    A) Nucleoside diphosphate kinase
    B)Ribonuclease
    C)Adenylate kinase
    D)Inorganic pyrophosphatase

    7) The concentrations of ATP, ADP, and AMP in a particular rat hepatocyte cell are 3.38 mM, 1.32 mM, and 0.29 mM, respectively. Will the reaction
    ATP AMP ? 2 ADP
    favor formation of products (2 ADP) or reactants (ATP AMP) under the conditions in this rat hepatocyte cell?

  • Synthesis of Cyclohexene from cyclohexanol
    1) Include an introduction explaining the purpose and reaction for this experiment.
    2) Draw the balanced chemical reaction and mechanism in your discussion
    3) SUMMARIZE THE VIDEO “Preparation of Cyclohexene from Cyclohexanol”. BE AS DETAILED AS POSSIBLE .
    4) ENUMERATE THE STEPS
    https://youtu.be/09CDqovJgKA
    4) Cite references used to help you write this lab report.
    5) Answer post lab questions pertaining to the experiment. (THE QUESTIONS WERE UPLOADED AS A PICTURE)

    Exp S235 Colligative Properties – Freezing Point Depression

    In this experiment you will measure the melting point/freezing point temperature of solutions of benzoic acid (solute) in biphenyl or benzophenone (solvents) as well as the melting point/freezing point temperature of the pure solvents. You will analyze and discuss your results based on your understanding of colligative properties and intermolecular forces.Your lab report should consist of the following sections with appropriate titles in this order:
    only did run 1 and 2
    Title page
    Purpose and procedures (scan/copied/pictures from lab notebook)
    Data and Observations (scan/copied/pictures from lab notebook)
    Analysis Sections: Begin with the graphs you generated during the experiment. Then include answers to the postlab questions found in the lab manual (see Exp S235 Colligative Properties – Freezing Point Depression). Remember to write each question before answering.
    do questions 2 a b c d, and question 4

    MUST BE ORIGINAL AND IDENTIFY GAP IN LITERATURE!!!! The topic has to be SCIENCE-BASED, not application-based. I am trying

    Chemistry Assignment Help MUST BE ORIGINAL AND IDENTIFY GAP IN LITERATURE!!!! The topic has to be SCIENCE-BASED, not application-based. I am trying to develop a chemistry research idea for a candidacy. I am open to analytical instrumentation ideas, as well as nanoparticle research.
    Require things that the proposal should include:

    * It would be beneficial for the proposal to entail three phases of the project that are interrelated to one another. For example, if my topic is heavy metal analysis, that would be the first phase. If there was some type of relation between heavy metal composition and absorption then phase 2 would be analyzing absorption effects due to heavy metal content and so on.
    * a suggested detailed method that will be followed
    * scientific purpose for looking a topic
    * Idea for stats to support proposal idea

    Synthesis of Cyclohexene from cyclohexanol. Lab report

    1) Include an introduction explaining the purpose and reaction for this experiment.
    2) Draw the balanced chemical reaction and mechanism in your discussion
    3) SUMMARIZE THE VIDEO “Preparation of Cyclohexene from Cyclohexanol”. BE AS DETAILED AS POSSIBLE . AND ENUMERATE THE STEPS.
    https://youtu.be/09CDqovJgKA
    4) Cite references used to help you write this lab report.
    5) Answer post lab questions pertaining to the experiment. (THE QUESTIONS WERE UPLOADED AS A PICTURE)

  • Homework chemistry
    Homework #3
    1. Which pairs of elements are likely to form ionic bonds (I) and which pairs are likely to form covalent bonds (C)?
    a. Carbon and hydrogen _____
    b. Sodium and sulfur _____
    c. Hydrogen and oxygen _____
    d. Magnesium and bromine _____
    2. Positively charged ions are called _______________________ and negatively charged ions are called ______________________________
    3. When the following atoms become ions what charges do they acquire?
    a. Li _____
    b. S _____
    c. Ca _____
    d. F _____
    4. Write
    the ion symbol for the atom with the given number of protons and electrons.
    5. What
    element fits each description?
    a. Four protons and two electrons ______
    b. 22 protons and 20 electrons _____
    c. 16 protons and 18 electrons _____
    d. 13 protons and 10 electrons _____
    a. A period 2 element that forms a 2 cation _____
    b. An ion from group 7A with 18 electrons ______
    c. A cation from group 1A with 36 electrons _____
    6. What
    a. b. c. d.
    7. Write a. b. c. d. e.
    noble gas has the same electronic configuration as each ion?
    O2- _____ Mg2 _____ S2- _____ Cl- _____
    the chemical formula for an ionic compound composed of each pair of ions. the sodium ion and the sulfur ion _______________________
    the aluminum ion and the fluoride ion ___________________
    the 3 iron ion and the oxygen ion ______________________
    the calcium ion and the nitrate ion ______________________ the magnesium ion and the carbonate ion _________________
    8. The recommended dietary allowance for calcium for teenage children is 1,300 mg per day. If a typical 8.0-fl oz glass of reduced-fat milk contains 298 mg of calcium, how many fluid ounces of milk does a teenager need to drink to get the entire recommended amount of calcium from this milk?

    Asisstance with Power Point Presenatation

    Hello, i need assiatnce with a power point presenatation that concerns Epinpehirne. the following is what should be the on the slides. My main purpose was the use for blood pressure.
    1. Find out when it was first manufactured or synthesized
    2. What company put it on the market
    3. Do a background on what it treats.
    4. Figure out what receptorit bond to, and what it ignites.
    5. Find out how it’s dosed. Like is it an inhaler, or needle?
    6. Find out the side effects of the medication.
    7. Find out the off label uses. Like if it’s designed for but then it’s used for b (example).

    STAT101Discussion Recognize the importance of statistics in daily life and work

    Chemistry Assignment Help To assess your ability to:
    Recognize the importance of statistics in daily life and work
    Action Items
    In the discussion board, give an example of how you have encountered statistics in your daily life or work. Discuss how statistics were used and their impact on you.
    Compare your response to those of your classmates for similarities or differences.
    Submission Instructions
    Complete and submit this assignment prior to this week’s in-class meeting.

    research proposal

    chemisty: short research proposal follow the template below about a specific subject , you do not have to do the budget and institutional support part
    There are number of antacids medication and they all claim to be the best at neutralizing acids but which one is the most effective, fastest acting and overall the best. Therefore, my at home research will be deciding which one is the best as well as compare some home remedies to those antiacid to compare their effectiveness

  • Lab and post lab questions
    PROCEDURE PART A: Pre Pop Procedure 1. Prior to lab obtain two packages of microwavable popcorns.
    2. Each package should have approximately 80-110 grams of popcorn in the package. Weigh each sealed package separately to validate they have the same amount of popcorn in each package. If you have multiple packages of popcorn to choose from, pick the two packages whose weight is the closest.
    3. Open one package and weigh out the popcorn contained in the package. Use a beaker as a weighing sample container.
    4. Fill the 100 mL graduated cylinder with approximately 40 mL of water. Record the actual volume. (The figure below is a 50-mL graduated cylinder).
    5. Add the popcorn to the 100 mL graduated cylinder. Record the actual volume.
    6. Calculate the volume of the popcorn from the difference in the water displaced.
    7. Calculate the density of the popcorn using the mass from Step 3 and the volume from Step 6. 8. Repeat Steps 3 to 7 if an extra package of popcorn is available. This will enable you to calculate the average density of the popcorn.
    PART B: Pop Procedure 1. READ AND FOLLOW THE INSTRUCTIONS ON THE BAG OF POPCORN WHEN COOKING THE POPCORN. 2. Pop the corn in one package of microwaveable popcorn. Be careful to read the instructions on the popcorn for the use in your microwave. PART C: Post Pop Procedure 1. With a ruler measure the three sides of the microwave bag.
    2. Calculate the volume of the popcorn.
    3. Use the mass obtained in Part A to calculate the density of the popcorn.
    4. Repeat Steps 1 to 3 if an extra package of popcorn is available. This will enable you to calculate the average density of the popcorn.
    DATA SHEET Part A: Determining the density of un-popped corn Trial 1 Trial 2 1. Mass of unpopped corn: ________ g ________ g
    2. Initial vol. of water in the grad.cyl. ________ mL ________ mL
    3. Final vol. of water in the grad.cyl. ________ mL ________ mL
    4. Net volume of object (L3-L2) ________ mL ________ mL
    5. Density of the object (L1 / L4) _________ g/mL ________ g/mL
    6. The average density of the unpopped corn: ___________ g/mL
    7. The actual (accepted/published) density of the unpopped corn is 1.224 g/mL
    8. Calculate the percent error in your determination: ________________% | 100 exp | × − = accepted value Accepted value erimental value Percent Error = __________ %
    Accepted Value = Line 8 Experimental Value = Line 6 Note absolute value symbols in the problem.
    PART B: Determining the density popped corn. Trial 1 Trial 2 1 Mass of the popcorn: ____________ grams _________ grams
    2. Length of the bag ____________ cm. _________ cm.
    3. Width of the bag ____________ cm. _________ cm.
    4. Height of the bag ____________ cm. _________ cm.
    5. Volume of the bag: V = L × H × W __________ cm3 or mL _______ cm3 or mL
    6. Density of the popcorn (L1/L5) ____________ g/mL _________ g/mL.
    7. The average density of the object: ___________ g/mL at _________ oC
    8. The predetermined (accepted/actual) density of the popped corn is 0.015 g/mL. If you used buttered popcorn the predetermined (actual) density of the popped corn is 0.075 g/mL.
    9. Calculate the percent error in your determination: ________________% | 100 exp | × − = accepted value Accepted value erimental value Percent Error = __________ %
    Accepted Value = Line 8 Experimental Value = Line 6 Note absolute value symbols in the problem.
    _________________ Exp. 04 ONLINE POST-LABORATORY QUESTIONS Type: S Title: Den 1
    1) For 1 point, identify how many significant figures that the density of the unpopped kernels of popcorn have.
    a. Type: S Title: Den 1a
    2) For 1 point, identify how many places below the decimal place the lengths of the bag of popcorn have.
    a. Type: S Title: Den 2
    3) For 1 point, identify how many significant figures that the density of the popped popcorn has. a. Title: Den 3 4) For 1 point, identify the % error for density of the un-popped kernels of popcorn.
    a) Less than 25%
    b) Between 25% and 75%
    c) Between 75% and 125%
    d) Above 125% Title:
    Temp 5) For 1 point, identify the % error for density of the popped popcorn.
    a) Less than 25%
    b) Between 25% and 75%
    c) Between 75% and 125%
    d) Above 125%
    Title: Error 6) For 2 points, consider the following situation. Half of the popcorn did not pop. Chose those responses below that describes how the un-popped popcorn will affect the results.
    a) The mass will decrease
    b) The mass will increase
    c) The volume will increase
    d) The volume will decrease
    e) The density of the popped corn will increase.
    f) The density of the popped corn will decrease
    Title: Properties 7) For 3 points, identify the properties of the popcorn which have changed.
    a) Mass
    b) Volume
    c) Density
    d) All of the above d) None of the above

    Chem 1 discusiion board

    As you learn to view the world through a chemistry lens, it will become important for you to learn to use the language of chemistry. There are some challenges associated with chemistry vocabulary because many of the words that are used in a technical sense in chemistry might also be used in everyday language. However, the meanings of the words in the two contexts can be very different. In the discussion questions for this course, we will practice using these terms and becoming comfortable with going back and forth between their everyday and technical meanings. This week, consider the following terms

    Precision
    Accuracy
    Respond to the following in a minimum of 175 words:
    Choose at least 2 terms from the list,(use the two bolded words) and answer the following questions for each term:
    What familiarity and prior knowledge do you have about the term?
    What does the term mean in everyday language to everyday people? Use examples to help describe your thoughts. How do people use the word?
    What does the term mean in technical language to chemists?
    How is the term related to the course student learning outcome: Explain matter at the microscopic level?
    What are the similarities and differences between the everyday and technical meanings and uses of the term?
    What impact might the similarities and differences have on your learning of chemistry concepts in this course?

    Chem 1 Lab safety report

    Chemistry Assignment Help Basically, we did a virtual lab on labster about lab safety on what to look for thats unsafe and whats safe in a lab setting
    I will attach the lab safety lab report worksheet. please answer under the questions that are being asked. Here is the rubric
    State the topic.10% of total grade

    Accomplished
    The topic was clearly stated; the topic correctly reflected the context of the laboratory experience. (This does not need to include a specific description of phenomenon or process or rationale.)

    90 – 100%

    I am so sorry to rush you. It is chemistry lab report and it is due tomorrow morning 7:00

    I am so sorry to rush you. It is chemistry lab report and it is due tomorrow morning 7:00 AM. I have some missing data. I will send you the missing datas in few hours. Until then can you skip the Data

  • Stoichiometry
    8 Fe S8 –> 8 FeS
    Use the balanced chemical equation above to answer the following: How many atoms of iron, Fe, are needed to react with 14.0 grams of FeS (87.91 g/mol)? Please type in scientific notation using the following format 6.022*10^23

    lab report conclusion – IDENTIFICATION OF UNKNOWN WITH IR AND NMR

    I will upload the manual. I just need conclusion explanation how I got the unknown I will also upload the picture of IR results and we just have to explain how we got that accordingly to the experiment explained in the manual. You have to explain what diffferent peks mean and accordingly to IR you have to explain how you identify the unknown and tell what unknown it is.

    Chromatography (TLC) of an unknown mixture

    Chemistry Assignment Help Microscale Flash and Gravity Column Chromatography, and Thin Layer Chromatography (TLC) of an Unknown Mixture
    Prepared by Ryan Paul Cortez and Nadene Houser-Archield* (modified by S.N.Yasapala)
    The Principles of Column Chromatography are similar to those of thin layer chromatography (TLC); however, TLC is typically used for identification purposes, whereas column chromatography is a preparative technique used to separate a mixture of compounds or to separate a compound from an impurity. Before you move to the next part please watch the videos provided below.
    Principles of TLC
    (https://www.youtube.com/watch?v=yig3QCfBTzc)
    Click above link to understand the principles of TLC and how you can use the information from TLC to identify the components of a mixture (for qualitative analysis) and how to select a suitable solvent for column chromatography.
    Principles of Column Chromatography
    (https://www.youtube.com/watch?v=yig3QCfBTzc)
    Click above link to understand theory of column chromatography. By watching the video above, you will learn how to pack a column, load a column with a sample, choose and use of an eluting solvent, and how to separate the mixture efficiently and minimize the contaminations (increase the purity of each component) during the separation process.
    When performing a column chromatography, following basic steps are used;
    Pack a vertical column with a stationary phase medium such as silica gel or alumina. Condition the stationary phase with a mobile phase; that mobile phase is the eluting solvent/solvent mixture. Load the sample onto the column; then, move it along, through the stationary phase by adding the mobile phase/eluting solvent. Polar compounds have strong attraction to the stationary phase and therefore move slowly down the column; whereas, nonpolar compounds, having little attraction to the stationary phase, move rapidly down the column. The more polar the eluting solvent, the faster all compounds will move down the column. The less polar the eluting solvent the slower all compounds will move down the column. In Flash Column Chromatography the eluting solvent is forced through the column via air or other gas pressure; this expedites the process; that is a flash separation is much faster than the corresponding gravity separation.Caution, the flash bulbs used in this experiment contain latex. If you are allergic, have your lab partner handle the bulb.In this exercise you are supposed to 1) separate a mixture of two unknown compounds, dissolved in a solvent, from one another by column chromatography and then 2) use TLC to identify the components. The components of the mixture could be acetophenone, benzoic acid, biphenyl, or methyl benzoate.

    Flash Column Chromatography1) Dry pack the column (Pasteur pipet):a) Obtain a clean dry Pasteur pipet—from now on it will be called a “column”. Place it in a buret clamp (on a buret stand). Using the long stem of a cotton swab stuff a small cotton filter disc into the nose of the column. Please watch the following video (https://www.youtube.com/watch?v=jwXZ8O1Rf7I) and have a look on Figure 1 to get some idea about how to do “part a”.
    Video may not explain an exact procedure what we are doing in the laboratory, but, it provides a very good idea about how to do the initial setting up.
    Figure 1: Adding cotton filter disc into the nose of the column
    b) Silica gel is a fine porous powder which can cause respiratory problems; in extreme cases it can cause silicosis (whose symptoms bear similitude to asbestosis). Do not breathe it in.Procedure for massing dangerous chemicals (in this case, 1 gram of silica gel): Stopper a 10mL Erlenmeyer flask. Mass the flask with the stopper on top. Calculate the mass you expect once the 1 gram of silica gel is added.
    In the hood,
    Add 2 – 3 spatulas of silica gel to the Erlenmeyer.
    Re-stopper the flask.Wipe down the exterior of the flask with a dry paper towel to remove any silica dust.
    Mass the stoppered flask, and contents.
    Add or remove silica gel, and go through the process again until the total amount of silica gel in the flask is ~1.0 gram.
    Using a waxed weighing paper, pour the silica gel into the column. Gently tap the sides until the silica gel has a level top.
    c) Tare a waxed weighing paper and then add ~0.2 -~0.3 grams of sea sand to it. Pour the sand atop the silica gel in the column. Tap it down until the sand has a level top. Your set up should be closely similar to the figure2.
    Figure 2: Column after filling silica gel and the sand
    2) Obtain eluting solvent 1:To a 25mL graduated cylinder add hexanes (25mL).3) Condition the column:
    Before adding the sample, it is very important to condition the column with eluting solvent to obtain optimum and reproducible results.a) Place a 25mL Erlenmeyer or a beaker beneath the column. Gradually, using a clean Pasteur pipet add eluting solvent 1 (hexanes) into the top of the column without disturbing the top of the silica gel (see figure 3). Fill the column to the top.b) Let the solvent drip from the column into the Erlenmeyer until the solvent level is approximately 1cm above the top of the sand. Fill the column again. Let the solvent drip into the Erlenmeyer until the solvent level is 1cm above the top of the sand. Fill the column a third time; let the solvent drip into the Erlenmeyer until the solvent level is just below the surface of the sand, but not below the top of the silica gel.
    Figure 3: Conditioning the column
    4) Shake the bottle of unknown mixture to promote homogeneity. Using a Pasteur pipet, obtain ~0.25mL of the unknown mixture assigned to your group. Remember, it is two compounds dissolved in a solvent.5) Loading the column: Load the ~0.25mL of solution from the Pasteur pipet onto the surface of the sand in the column (see figure 4). Let the Mixture go just beneath the surface of the sand; then, add 1-2mL of eluting solvent 1 (hexanes) to the column via pipet. Let the solvent drain just below the top of the sand. Again, add 1-2mL of eluting solvent 1 to the column via pipet. Let the solvent drain just below the top of the sand. NOTE: You may not see any color of the sample if the mixture does not contain a colored compound.

    Figure 4: Loading the column with sample

    6) Running the column: By flash, be sure not to attach the flash bulb to the column—this would lead to difficulty in controlling the pressure and sucking the silica and sand out of place.a) Place a 10mL receiving beaker or 10mL Erlenmeyer flask, labeled “1”, beneath the column. Fill the column with eluting solvent 1 (hexanes).b) Flash the column until the solvent is ~ 1 cm above the sand. That is, place a flash bulb above the column/Pasteur pipet; squeeze the bulb in order to force air into the column. The solvent will move rapidly down the column (see figure 5).

    Figure 5: Running the column
    i. Refill the column and repeat the process until ~5mL of the eluted solvent is collected in receiving flask/beaker 1.ii. Change to another receiving vessel labeled “2” and flash until another 5mL of eluted solvent is collected.iii. Repeat this process with receiving vessels 3, 4, and 5 (see figure 6).
    Figure 6: Collecting the fractions
    c) Place receiving vessel 6 beneath the column. i. Fill the column with isopropyl alcohol or ethanol (eluting solvent 2). ii. Flash the column with eluting solvent 2 (alcohol) until ~ 5-10mL elutes.
    Then run a column by gravityFollow the same procedure for flash (as above) but do not flash the column; simply let it drip by gravity.
    7) Identify fractions that contain components of the mixture (Be sure not to mix up your flash fractions with your gravity fractions):a) At the station setup by the instructor, make sure no organic solvents or other flammables are nearby. Make several micropipets from capillary tubes (open on both ends), using a Bunsen burner.b) Using micropipets, spot a portion of each fraction onto a TLC plate to determine which fractions (1,2,3, etc.) contain components of the mixture. Each of the possible unknowns has a UV active chromophore that will fluoresce under a short wave, 254nm UV lamp.
    8) Analysis of fractions that contain UV active components:
    Before you read the next step of the procedure, please watch the following video to be familiar with how to run a TLC plate to identify components of a mixture.
    How to run a TLC plate in the laboratory
    (https://www.youtube.com/watch?v=qdmKGskCyh8)
    a) To a 10mL graduated cylinder add 8.5mL of hexane and 1.5mL of ethyl acetate (EtOAc). Pour this mixture into a TLC developing chamber (a beaker wider than your TLC plate). Cover the chamber with an inverted watch glass.b) Obtain two TLC plates. Check them under the UV lamp for cleanness and for the presence of indicator (they should glow under the UV light). Do not look directly into the lamp light! It will damage your eyes. Using a pencil (not a pen!) draw a horizontal line ~1.5cm from the bottom of each plate.
    c) Spot a plate with each fraction from 1 through 6 that had components from the mixture. Below the pencil line, label the spots “1”, “2”, “3”, etc. Take the TLC.
    (You may choose to clean and reuse your micropipets as follows: wipe it off with a kimwipe; touch it to a kimwipe to empty it of its contents; dip it into clean EtOAc (in a small beaker or flask) and then touch it to the kimwipe to empty it; do this several times.)
    d) Without splashing place the spotted TLC plate in the developing chamber (tweezers might be helpful). Put the watch glass back on top. Allow the plate to develop until the solvent front is between 1 – 1.5cm from the top of the plate. During development, do not bump the table or otherwise cause movement in the developing chamber.
    e) Pull the plate out of the chamber (tweezers might be helpful) and immediately trace the solvent front with a pencil. Examine the plate under a UV lamp. Circle/trace all spots.
    f) Calculate the Rf value for each spot on each plate.
    g) Combine like fractions (fractions with the same Rf value) that are pure (a pure fraction will have only one spot in its TLC). At this point, you should have two pure fractions. Set aside any impure fractions.
    h) Spot a plate with the known solutions (these are already mixed for you) and the two unknown fractions. Check the spots under the UV lamp; if a spot does not show up as a fluorescent purple dot or if it is too light, re-spot it.
    i) If a component is a solid obtain the melting point.j) If a component is a liquid take the IR spectrum.Save your TLC plates. You will tape them to your lab report.
    7) Clean up:a) In the hood, tap the contents of the column into the designated waste container.b) Follow normal cleaning procedures.
    Sample Data
    Given below are the sample data you would have obtained if you performed this lab in the laboratory. Rf value for each pure compound (under same experimental conditions) of the mixture is also given for your comparison.
    Mixture/fraction
    Distance traveled by solvent front (cm)
    Distance travelled by each spot (cm)
    Known (spot 1)
    5.5
    0.1
    Known (spot 2)
    5.5
    2.3
    Known (spot 3)
    5.5
    3.5
    Known (spot 4)
    5.5
    4.2
    Unknown (fraction 2)
    5.5
    4.1
    Unknown (Fraction 4)
    5.5
    1.9

    Compound
    Rf value
    Benzoic acid
    ~ 0
    Methyl benzoate
    0.62
    Acetophenone
    0.40
    Biphenyl
    0.77

    Post Lab Questions for Flash Column Chromatography and TLC Report:
    1) Fill in the chart below for each known, and for each solvent.
    Structural formula:
    Line structure:
    2) Data table containing all Rf calculations for knowns and for fractions. Identification of each spot3) Why it is necessary to trace your TLC plates (of the knowns and of the fractions) into your notebook?
    4) Rank the knowns in order of increasing polarity according to their Rf values.5) Of the solvents ethyl acetate and hexane, which is most polar? Briefly explain6) What would you expect to see if pure hexane had been used to elute the mixture in the column and/or the TLC?7) What would you expect to see if pure EtOAc had been used to elute the mixture in the column and/or the TLC?8) Describe the stationary phase a) in TLC b) in column chromatography.9) Describe the mobile phase a) in TLC b) in column chromatography.10) Which of the compounds below should be UV active? In the space below the table, briefly explain
    a)
    b)
    c)
    d)
    e)
    f)
    11) Which type of compound a) polar or b) nonpolar is most strongly adsorbed by the stationary phase of a column or a TLC plate? Briefly explain.12) Why is it not feasible to analyze benzene by TLC?13) Suppose the following were a mixture of compounds and no chemical reactions took place among them. Place them in the order in which they would elute from a column (first compound to exit the column to the left, last compound to the right): R2C=O, RCO2H, R(C=O)H, RBr, RCO2R, ROR, R2C=CR2, ROH, RH14) Place the following solvents in order of decreasing eluting power: hexane, ethanol, acetone, ethylacetate, water, toluene, carbon tetrachloride, dichloromethane, propan-1-ol, diethyl ether. (If you are not yet proficient with polarity concepts, dielectric constants might be helpful (use the CRC)).15) In TLC, why aren’t liquid samples spotted pure/at their full strength; i.e. why are they diluted?
    Reference
    https://orgchemboulder.com/Technique/Procedures/Columnchrom/Procedure.shtml

    In what ways does chemistry affect your life? Discussion Board

    In what ways does chemistry affect your life? Hint: allergies are caused by particles called allergens in the air or that are contained in other substances. Also remember, you are using chemistry in the kitchen. How else does chemistry play a role in your everyday activities. Reply to discussion question should be 150 words or more and response to another student at least 100 words.
    If you use an outside source for material, don’t forget to give a citation and reference. Here is a link that will help you : https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/in_text_citations_the_

  • Photosystems Experiment Lab Report
    I have the lab results ready I just need help with these two steps: (explanation and typing part)
    D. Results
    The length of this section will vary from experiment to experiment. Present the results in the most clear and understandable fashion possible. This may involve Figures, Tables, Charts, and/or Graphs, but must also contain typed explanatory text. You cannot just present a collection of tables and graphs and call that your Results section; you must explain in words what the charts and graphs demonstrate. Data shown in a graph also must be presented in a table.
    E. Conclusion and discussion
    Discuss the results of your experiment. In your introduction there was a purpose statement. Address this statement by explaining the results gathered, and if the experiment accomplished what was said in the purpose. Finally, do include error analysis. Describe what errors may have taken place and the impact that these had on the results.

    pre-lab.

    Pre labs should consist of purpose of the lab, procedure and data tables.
    so it is a pre-lab read it then write the purpose of the lab, procedure and data tables
    should be in your own word so do not just copy the procedure

    pre-lab.

    Chemistry Assignment Help Pre labs should consist of purpose of the lab, procedure and data tables.
    so it is a pre-lab read it then write the purpose of the lab, procedure and data tables
    should be in your own word so do not just copy the procedure

    Hydrate Molar Mass Conversions

    How many grams of Sodium metal is required to completely react with 100 g of Magnesium chloride hexahydrate in a single replacement reaction? (Write a balanced equation first. You don’t need the hydrate part in the balanced equation, you only need it when you do the molar mass of the given).

  • Chemistry Question
    Very simple assignment, please read the instructions carefully to know what you should do.
    This assignment is very easy, and it will not take more than half-hour to complete it after you watch the video to know what you need to do. So please try your best to do it.
    I posted a link for the video; you have to watch the video carefully to get all information needed in the pre-lab assignment. Please don’t forget to collect the data when you watch the video if it’s required.
    Also, please make sure you follow the pre-lab rubric file I’ve uploaded here. In addition, please make sure you write your own words when you fill the information in the pre-lab assignment.
    If there is anything you need for this assignment or you don’t understand something in the instructions, please feel free to ask me.
    This is the link for video.
    https://we.tl/t-XWqsOdbn7y
    I post the link for the video, and I think now you can watch the video and if doesn’t open with you please let me know. Please don’t forget to follow the pre-lab rubric.

    Pre-labs: Students must watch the pre-lab lecture video and prepare a pre-lab report for every experiment. You should have the title, aim of the experiment, procedure, and any additional information about the experiment clearly and legibly written in your lab notebook. A separate section should be included for possible hazards of each chemical used in each experiment. A brief procedure should be included in the pre-lab as well. The lab notebooks are also for recording observations and data obtained during watching the lab videos. The upkeep of the lab notebook will affect your final grade. Pre-labs/Lab Notebook will total 10 % of the final grade. Poor notebook upkeep will be reflected in this portion of your grade.
    The rubrics for the pre-lab are found in your lab manual page x. It will also be posted on canvas at the beginning of the semester. This some of helpful information to the pre-lab assignment.

    fill out chemistry lab

    Lab Report: Complete page 7. Show all calculations.
    watch video copy paste name in youtube i can not ad links to videos for some reason
    KCC, Fall 20, Chem11, Acetic Acid Titration (Part 1)KCC, Fall 20, Chem11, Acetic Acid Titration (Part 2)

    Chemistry question

    Chemistry Assignment Help make it hand written and take a picture of it Write a balanced molecular and net ionic equation for all chemical reactions in this experiment.
    Step 2: Copper (II) hydroxide from copper (II) nitrate The reaction taking place is aqueous copper (II) nitrate reacting with aqueous sodium hydroxide to give solid copper (II) hydroxide and aqueous sodium nitrate.
    Molecular:
    Complete Ionic:
    Net Ionic:
    Step 3: Copper (II) oxide from copper (II) hydroxide The reaction taking place is the decomposition of solid copper (II) hydroxide into solid copper (II) oxide and water with heating
    Molecular:
    Complete Ionic:
    Net Ionic:
    Step 4: Copper (II) sulfate from copper (II) oxide The reaction taking place is solid copper (II) oxide reacting with sulfuric acid to produce aqueous copper (II) sulfate and water.
    Molecular:
    Complete Ionic:
    Net Ionic:
    Side reaction: A second reaction also occurs. Zinc metal reacts with sulfuric acid to yield hydrogen gas and zinc sulfate. Because of this, you must add an excess of zinc metal.
    A) Molecular
    Net Ionic:
    Complete Ionic

    lab experiment

    i need you to do the workings in a piece of paper an take a picture of the same then upload it for me. Thanks.
    Write a balanced molecular and net ionic equation for all chemical reactions in this experiment.
    Step 2: Copper (II) hydroxide from copper (II) nitrate The reaction taking place is aqueous copper (II) nitrate reacting with aqueous sodium hydroxide to give solid copper (II) hydroxide and aqueous sodium nitrate.
    Molecular:
    Complete Ionic:
    Net Ionic:
    Step 3: Copper (II) oxide from copper (II) hydroxide The reaction taking place is the decomposition of solid copper (II) hydroxide into solid copper (II) oxide and water with heating
    Molecular:
    Complete Ionic:
    Net Ionic:
    Step 4: Copper (II) sulfate from copper (II) oxide The reaction taking place is solid copper (II) oxide reacting with sulfuric acid to produce aqueous copper (II) sulfate and water.
    Molecular:
    Complete Ionic:
    Net Ionic:
    Step 5: . Recovery of copper from copper (II) sulfate The reaction which occurs is zinc metal reacting with aqueous copper (II) sulfate to produce copper metal and aqueous zinc sulfate.
    Molecular:
    Complete Ionic:
    Net Ionic:
    Side reaction: A second reaction also occurs. Zinc metal reacts with sulfuric acid to yield hydrogen gas and zinc sulfate. Because of this, you must add an excess of zinc metal.
    A) Molecular
    Net Ionic:
    Complete Ionic

  • Chemistry Question
    Hi need assistance with a practice test that is weighted more than the final. it’s a practice test that is timed but i will send pictures. the zip file has the concepts that will most likely be covered. there will be 20 questions: multiple choice and a some drawn structures. you also have to be quite quick since there is a strict limit of time. Thank you ^^

    You need to create 2 pieces from the list provided in the SCH4U document for each of the units,

    You need to create 2 pieces from the list provided in the SCH4U document for each of the units, so 4 in total for the 2 units (Organic chemistry and Atomic and Bonding theory), it can’t be cited from any website as I have already learned the content. I suggest going with a cheat sheet and a checklist of things to know for each of the units, you may leave part 2 out to give yourself more space for the cheat sheet and checklist. You can also replace the checklist with any of the other options, but if you can please do the detailed cheat sheet for both. I have also gave you the handout for the topics I have learned in both units so you can summarize. Sorry if it is a lot of instructions, I appreciate it thank you. If more pages are required that can also be done, thank you once again.

    I need 5 chem questions answered.

    Chemistry Assignment Help 1. Using 5.61×10^14, calculate the energy of this emitted green radiation, in J. Report your answer in scientific notation.
    2. Suppose you have a bag of chips which also contains 179.1 mL of air. The air pressure outside is 95.5 kPa. If you go on an airplane and the air pressure on the bag of chips is 73.8 kPa when you’re at cruising altitude, what will be the new volume for the air inside that bag? ______ mL
    3. Suppose you are scuba diving, and you inhale from your tank and get a certain total air volume in your lungs. What was that total volume of air in your lungs? Use the following information to calculate this: When you took that breath of air, the pressure on your lungs was 194.2 kPa, because you were very deep in the water. If that’s the pressure on your lungs, then that is also the pressure of the air inside your lungs. Still holding your breath, you swim a little closer to the surface, to where the pressure is only 112.9 kPa. The volume of air in your lungs seems to grow, even though you are holding your breath. The volume of air in your lungs grows to 7.31 L. Using this information, what was the volume of air in your lungs right after you inhaled?
    _____ L
    Hint: This time, you calculate V1 , and you find V2 , P2 , and P1 in the problem. The volume units are L in this problem, instead of mL, but this makes no difference at all to your calculation.
    4. Suppose you fill a huge black plastic bag with 434.9 L of air on a sunny day, when it’s 25.4 degrees C outside. You tie the bag off, and the black plastic material is very thin, so the bag starts to heat up due to the sunlight. It expands so much that it begins to float up into the sky. The air in the bag expands because of the heat to a volume of 494.1 L. What must be the new Celsius temperature inside the bag?
    HINT: Don’t forget to convert Celsius temperatures to Kelvin when you solve the problems!
    5. When you make a chocolate dessert bowl, you cover a balloon with molten chocolate and then you set it all in the freezer. The low temperature causes the air in the balloon to change in volume. This separates the balloon from the frozen chocolate, so you can pop and remove the balloon. Suppose your balloon’s volume when you cover it with chocolate is 57.82 mL. You do this at a high temperature, 38.9oC. The temperature in the freezer is -10.0o but remember to change these temperatures to Kelvin. What is the new volume of the balloon, after freezing in the freezer?

    Chemistry Question

    Requirements:
    look at the pricing over time of two textile products. These can be fiber, yarn, fabric, or a finished product. The two products can be similar (e.g., two types of fiber, or two different yarns) or sequential in production (e.g., fiber and yarn, or yarn and a fabric).
    look at the price development over a long period of time, (5 to 10 years) and show monthly data. The prices should be actual (nominal) prices, not price indices, or inflation corrected prices (like in 2010 US Dollars).
    The paper should have title page, a table with the prices of the two products over time, a chart showing the same information graphically, and a brief analysis/commentary describing what you see. (No less than 300 words) Don’t forget to put the bibliography with your source(s)

  • quantum mechanics chemistry:create a video explaining how to do the problem below
    quantum mechanics chemistry:create a video explaining how to do the problem below,
    explain step by step and why you choose the way you chose to solve it, only one problem attached below, does not have to be a certain amount of time but just make sure to explain it step by step

    quantum mechanics chemistry:create a video explaining how to do the problem below

    quantum mechanics chemistry:create a video explaining how to do the problem below,
    explain step by step and why you choose the way you chose to solve it, only one problem attached below, does not have to be a certain amount of time but just make sure to explain it step by step

    Chemistry Question

    Chemistry Assignment Help There is two videos this video https://youtu.be/VlB4AJjvtR4 you have to write out the 24 questions and answer them they’re easy questions and the video has the answers
    the second video https://youtu.be/GyN2RhbhiEU just write a paragraph on the difference betweens law and theories
    it’s an easy assignment please type or write it out on the page i provided if you need more space you can add an extra space but please start it on the page i attached

    discussion

    Step 1: Find 1-2 videos
    Now it’s time that you apply everything that you learned about finding information, find educational videos on any of the topics listed below, dealer’s choice. It is ok if your video goes over multiple topics on the list.
    When deciding what videos to post keep in mind the following guidelines:
    Your videos should only cover only the materials presented in Chapter 3: Matter and Energy from “Introductory Chemistry”,
    Your videos should not be longer than 5 minutes.
    You will be graded on credibility, so make sure that you can explain why a video is credible
    No credit will be given to a video that has already been posted by another group member (the same topic is ok, the same video is not)
    Make sure that you check to see what has been posted before you post, there is no reason why this discussion should have 5 videos on the states of matter
    If I post that a specific topic become off limits (because there are enough videos on the topic) then any videos posted on said topic will no longer receive credit.

    Topics
    The 3 states of matter and the transitions between them
    Physical and chemical properties
    Physical and chemical changes
    Density is a property of matter
    How is matter organized
    Different types of mixtures
    Difference between an element, compound, and molecule
    Separating mixtures using distillation
    Separating mixtures using filtration
    Step 2 – Post your videos
    Post your video(s) along with a brief explanation as to why you chose each video and why you think the video is credible

  • Need help on 3 homework online
    I have ch. 2 thethrough 4 thar needs to be done by Wednesday. It has unlimited attempts if you get it wrong but I do need a tutor that’s great with chemistry. The instructions of how to get to my homhomework is in the pdf file.

    Biochemical Molecule

    REPORTS MUST
    FOCUS ON A SPECIFIC BIOCHEMICAL MOLECULE
    DEPICT THE STRUCTURE OF THE MOLECULE
    DEPICT THE STRUCTURE OF AT LEAST ONE MOLECULE IT INTERACTS WITH
    INCLUDE A CHEMICAL REACTION (since this is bioCHEMISTRY)
    HAVE AT LEAST 3 REFERENCES – even if your report is a single sentence, one reference doesn’t count for beans in the scientific world.
    Good things to include might be where your molecule comes from (synthesis pathway? breakdown product? being eaten?), where it exists in the system (liver? brain? flagellum?), and where the described reaction takes place (membrane-bound? cytoplasmic? in the blood?). Statements based on references should be indicated in the text, and direct quotes must be indicated with quotation marks.
    At least 750 words

    Biochemical Molecule

    Chemistry Assignment Help REPORTS MUST
    FOCUS ON A SPECIFIC BIOCHEMICAL MOLECULE
    DEPICT THE STRUCTURE OF THE MOLECULE
    DEPICT THE STRUCTURE OF AT LEAST ONE MOLECULE IT INTERACTS WITH
    INCLUDE A CHEMICAL REACTION (since this is bioCHEMISTRY)
    HAVE AT LEAST 3 REFERENCES – even if your report is a single sentence, one reference doesn’t count for beans in the scientific world.
    Good things to include might be where your molecule comes from (synthesis pathway? breakdown product? being eaten?), where it exists in the system (liver? brain? flagellum?), and where the described reaction takes place (membrane-bound? cytoplasmic? in the blood?). Statements based on references should be indicated in the text, and direct quotes must be indicated with quotation marks.
    At least 750 words

    Research paper on Diabetic Ketoacidosis. 800 words, do not add filler to extend word count. 1 figure that inform

    Research paper on Diabetic Ketoacidosis. 800 words, do not add filler to extend word count. 1 figure that inform and contributes to your content. Figures could be diagrams, graphs, tables, or learning schematics like a venn diagram. Must include a caption to describe the picture’s significance.

    I have included Cited sources/articles that I would like used for the paper. Feel free to add additional sources.

    Ensure paper:

    -Ties between the chemistry topic and nursing are well explained and clear.
    – great use of visuals (drawings, models, ect.) to demonstrate points
    – Chemistry used is accurate and well explained. Chemistry and application are woven together well.
    – Topic is well supported by APA cited sources
    -Information is presented using clear and concise language in an organized manner.
    – No errors in English grammar, spelling, syntax, and punctuation.

  • Reaction between tetraphosphine, Fe(BPh4)2 and NaH
    The reaction between the tetraphosphine 4 (given below), Fe(BPh4)2 and NaH gives a diamagnetic compound of empirical formula C66H63BFeP4 (A). The 1H NMR spectrum of A exhibits signals due to phenyl and CH2 protons, along with a complex multiplet at -11.7 ppm; the relative intensity of this highfield signal compared to the signals due to the CH2 and phenyl protons is 1:12:50. The 31P{1H} NMR spectrum of A consists of a pair of triplets of equal intensity at 119.3 and 99.4 ppm, respectively. What is the structure of A?

    Chemistry Question

    Hello,
    Can you please help me dissect the attached peer reviewed article into its various parts, by conducting research using primary literature sources.
    Describe the article in your own words (not verbatim from the text) including the Background, Methods, Results and Conclusions.
    Write a statement of your response to the article based on background research
    Minimum length is 2 typewritten pages, 12 point type, double spaced.
    I have attached the article to this request

    organic Chem lab

    Chemistry Assignment Help For this lab there will be no experiment conducted. The title is called
    Synthesis p-bromoanilineStart Assignment
    attached are readings, videos and examples to help you with this lab
    please answer the following as well
    Do a full report and use data from video or any resource. You need discuss the mechanism.
    PS: You need explain the change of 1H NMR, 13C NMR, IR and mass spectra for the experiment (from the start material to the product)
    ——This is needed for any report with synthesis.

    Chemistry Question

    Hello,
    Can you please help me dissect the attached peer reviewed article into its various parts, by conducting research using primary literature sources.
    Describe the article in your own words (not verbatim from the text) including the Background, Methods, Results and Conclusions.
    Write a statement of your response to the article based on background research
    Minimum length is 2 typewritten pages, 12 point type, double spaced.
    I have attached the article to this request