Name
Date
Class
THE BEHAVIOR OF GASES
Chapter Test B
A. Matching
Column A
1. At constant volume and temperature, the
total pressure exerted by a mixture of gases
is equal to the sum of the partial pressures
of the component gases.
2. The volume of a fixed mass of gas is
directly proportional to its Kelvin
temperature if the pressure is kept constant.
Column B
a. combined gas law
b. ideal gas constant (R)
c. diffusion
3. The rate of effusion of a gas is inversely
proportional to the square root of its molar
mass.
d. compressibility
4. the contribution each gas in a mixture
makes to the total pressure of that mixture
e. Boyle’s law
5. a measure of how much the volume of
matter decreases under pressure
f. partial pressure
6. For a given mass of gas at constant
temperature, the volume of the gas varies
inversely with pressure.
7. the tendency of particles to move toward
areas of lower concentration until the
concentration is uniform throughout
P ×V
P ×V
8. 1 1 = 2 2
T1
T2
9. the escape of a gas through a tiny hole in a
container of gas
10. 8.31 (L·kPa) / (K·mol)
g. Dalton’s law of partial
pressures
h. effusion
i. Charles’s law
j. Graham’s law of effusion
B. Multiple Choice
11. Reducing the volume of a contained gas by one third, while holding
temperature constant, causes pressure to
a. be decreased by two thirds.
b. be increased by two thirds.
c. be decreased by one third.
d. be increased by one third
12. Which of the following would double the pressure on a contained gas at
constant temperature?
a. doubling the volume of the container
b. halving the number of particles in the container
c. doubling the number of particles in the container
d. none of the above
13. A gas occupies a volume of 2.50 L at a pressure of 350.0 kPa. If the
temperature remains constant, what volume would the gas occupy at 1750
kPa?
a. 5.00 L
c. 12.5 L
b. 0.500 L
d. 1.40 × 102 L
14. If the temperature of a gas in a closed container increases
a. the pressure of the gas decreases.
b. the average kinetic energy of the molecules decreases.
c. the molecules collide with the walls of the container less frequently.
d. the pressure of the gas increases.
15. Absolute zero is
a. –273.15°C.
b. the lowest possible temperature.
c. the temperature at which the average kinetic energy of particles would
theoretically be zero.
d. all of the above
16. The graph of several pressure-volume readings on a contained gas at
constant temperature would be
a. a straight line.
c. a horizontal line.
b. a curved line.
d. a vertical line.
17. At constant pressure, the volume of a fixed mass of gas and its Kelvin
temperature are said to be
a. directly related.
c. unrelated.
b. inversely related.
d. constant.
18. The temperature of 6.24 L of a gas is increased from 25.0°C to 55.0°C at
constant pressure. The new volume of the gas is
a. 13.7 L.
c. 6.87 L.
b. 5.67 L.
d. 2.84 L.
19. A temperature of –25°C is equivalent to:
a. 248 K.
c. –25 K.
b. 25 K.
d. 298 K.
20. A sample of chlorine gas has a pressure of 7.25 kPa at 20.0°C. What will its
pressure be at 60.0°C if its volume remains constant?
a. 2.42 kPa
c. 21.8 kPa
b. 8.24 kPa.
d. 6.38 kPa
21. If a sample of oxygen occupies a volume of 2.15 L at a pressure of 58.0 kPa
and a temperature of 25°C, what volume would this sample occupy at 101.3
kPa and 0°C?
a. 1.35 L
c. 4.10 L
b. 1.13 L
d. 3.44 L
22. The volume (in L) that would be occupied by 5.00 mol of O2 at STP is
a. 0.411 L.
c. 41.6 L.
b. 22.4 L.
d. 112 L.
23. How many moles of H2 would be contained in 4.0 L of the gas at 202.6 kPa
and 127°C?
a. 89.6 mol
c. 0.24 mol
b. 6.38 mol
d. 0.77 mol
C. Problems
Solve the following problems in the space provided. Show your work.
27. A sample of hydrogen occupies a volume of 1.20 L at a pressure of 425 kPa. If the
temperature of the gas is kept constant, what would the new volume of the gas be at 615
kPa?
28. A sample of nitrogen occupies a volume of 0.650 L at 20.0°C. What volume would the gas
occupy at 40.0°C if the pressure remains constant?
29. The temperature of a sample of helium at 85.0 kPa is 37°C. If the volume of the gas
remains constant, at what temperature (in °C) would the pressure of the gas be at 98.0
kPa?
30. If a sample of oxygen gas occupies a volume of 3.50 L at 57°C and 80.0 kPa, what volume
would the gas occupy at STP?
31. How many grams of CO2 would be contained in 8.0 L at 152 kPa and 27°C?
D. True-False
Classify each of these statements as always true, AT; sometimes true, ST; or never true, NT.
33. Doubling the number of particles of gas in an inflated tire doubles the pressure of the
gas in the tire.
34. Halving the Kelvin temperature of a gas in a rigid container decreases the gas pressure
by one half.
35. The graph of a relationship between variables that is directly proportional is a straight
line.
36. At constant volume, if the Kelvin temperature of a gas is doubled, the pressure of the
gas is halved.