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# 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

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