Last modified: Wed 12/31/1969 06:00:00 pm ACA

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


First Name:

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Laboratory Section:

1. Earlier the relationship between the pressure of a gas and its volume was established. What is the pressure of a gas due to? (...for gases what causes pressure?) Briefly explain.

2. Another pressure commonly discussed is atmospheric pressure (the pressure due to the atmosphere). When we climb a mountain what happens to the atmospheric pressure? Does it increase, decrease, or stay the same? Explain briefly.

3. Here is a clip of Dr. G making a barometer. (Click on the play button to start the video.)

What is the value of atmospheric pressure measured by the barometer?

mm Hg

(NOTE: To play this movie you need the QuickTime Player. )

 

4. A sample of gas occupies a volume of 250 mLs and exerts a pressure of 700 mm Hg. Calculate the pressure exerted by the gas sample (assuming temperature and the amount of gas remain constant) if the volume of the gas sample increases to 325 mLs.

mm Hg

5. Here is a clip with Nancy demonstrating what happens to a sample of helium at room temperature being cooled to 77 K (-196 ˚C). Describe what happens when the sample of helium gas in the balloon is cooled.

(NOTE: To play this movie you need the QuickTime Player.)

 

6. A sample of helium occupies a volume of 18.0 Liters at 24.0 ˚C. Calculate the volume exerted by the gas sample (assuming pressure and the amount of gas remain constant) when the temperature of the gas is lowered to -196 ˚C.

L

7. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

8. If there is one question you would like to have answered in lecture, what would that question be?