Question

Can somebody help me with this Chemistry Portfolio? (GACA)

Answer 1

Introduction

Boyle’s law explains the relationship between the pressure and volume of an ideal gas when the temperature and amount of gas inside a container remain constant. The purpose of this lab is to investigate the relationship between the volume of a container and the pressure of the gas inside the container.
Procedure

You may recall that Boyle’s law states that the product of the pressure and volume of an ideal gas is equal to a constant.

The equation that describes Boyle’s Law is upper P times upper V equals k, where P is pressure in atmospheres, V is volume in liters, and k is a constant.

If k is a constant, how will a change in volume change the pressure? One way to think about this is to choose an arbitrary number to represent k. For example, assume that k always equals 12. What numbers can be multiplied together to equal 12?

Choose one set of numbers. Assign one of them to represent P and the other to represent V. What happens to P if V is assigned the larger number? What happens to P if V is assigned the lower number?

Observe the relationship between P and V. Is it a directly proportional relationship or an inversely proportional relationship?

Conducting an experiment that holds the number of particles of a gas and the temperature constant would allow for an investigation into how volume and pressure are related. Assume 200 particles of a heavy species gas are pumped into a container that has an adjustable volume.

The addition of 200 particles of gas initially results in a pressure of 1.00 atm.

The temperature inside the container is 300 K.

As the volume is adjusted, the number of particles and the temperature do not change, but the pressure does.

The product of the volume and pressure must stay constant. Predict what will happen to the pressure if the volume is decreased.

The following table shows the data gathered during an experiment with a heavy gas species. Complete the table by calculating the constant, k.

Heavy Gas Species

Volume (L) Pressure (atm) upper P times upper V equals k
6.00 1.12
5.40 1.29
3.80 1.72
8.00 0.85


Assume that the experiment is repeated with 200 particles of a light gas species at a temperature of 300 K. The following table shows the data gathered. Complete the table by calculating the constant, k.

Light Gas Species

Volume (L) Pressure (atm) upper P times upper V equals k
6.00 1.04
5.40 1.15
3.80 1.57
8.00 0.78
Analyze

Based on the data, what happens to the pressure of the gas as the volume increases?

Look up Boyle’s law in a science textbook. How do the results of the experiment support or contradict Boyle’s law?

Go back to the data tables. Good data may show minor variations, but the values for k should remain relatively consistent.

What is the average value of k for the heavy gas species?
What is the average value of k for the light gas species?
How does the molecular weight of the gas affect the k-value?

Based on the results of this lab, develop a hypothesis to explain why bubbles exhaled by scuba divers grow in size as they reach the surface of the ocean.

Answer 2

what are you specifically struggling with here

Answer 3

The first table. So k is the temperature, right? I am still confused about how the k relates to P and V

Answer 4

For example the first row. Volume is 6(L) Pressure is 4.12(atm) and I don't know how to figure out what k is. What does it mean by upper P and V?

Answer 5

k is just a constant that is equivalent to Pressure multiplied by the Volume

Answer 6

k is unitless (technically) i guess in this case you could say your constant is in terms of L*atm

Answer 7

k should be roughly equivalent in all your equations for each specific test

Answer 8

does that clarify anything?

Answer 9

That makes sense. So in the first row of the chart k would be 6.72?

Answer 10

im getting values closer to around 6.2

Answer 11

which calculation did you do?

Answer 12

6*1.12

Answer 13

sorry i was looking at the wrong sets of numbers. Your calculation is fine. k (the constant) should be around your found value of 6.72 give or take +-0.1 for each of your calculations for that experimental test.

Answer 14

It's no problem. Thank you so much for helping me! You are a good teacher. :)

Answer 15

Actually, now this question is confusing me ; How does the molecular weight of the gas affect the k-value?
I thought that it didn't affect the k-value. (?_?)

Answer 16

Oh, actually, I guess it just directly affects the k-value.