Leader: Ugerah
Course: Chem 167
Ch 5.1-5.3
Instructor: Meyer
Supplemental Instruction
Iowa State University
Date: Sept 25 2016
1. Which of the following properties does not describe gases?
a. Gases expand to completely fill their containers.
b. Gases mix completely and uniformly with each other.
c. Gases can be easily compressed.
d. Gases have relatively low densities.
e. Gases volumes are not usually affected by temperature.
2. Which of the following substances are not considered part of urban air pollution?
a. N2
b. NO
c. O3
d. CO
e. SO2
3. Answer the following questions in terms of the gas laws we’ve learned so far:
a. Why do your ears “pop” on occasion when you swim deep underwater?
Chem 167 SI:
b. Why is it dangerous to store compressed gas cylinders in places that could
become very hot?
4. A sample of CO2 gas has a pressure of 56.5 mm Hg in a 125-mL flask. The sample is
transferred to a new flask, where it has a pressure of 62.3 mm Hg at the same
temperature. What is the volume of the new flask?
5. A balloon filled with helium has a volume of 1.28*103 L at sea level where the pressure
is 0.998 atm and the temperature is 31 0C. The balloon is taken to the top of a mountain
where the pressure is 0.753 atm and the temperature is -25 0C. What is the volume of the
balloon at the top of the mountain?
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