Name_________________Hr____
Chapter 18 Test Gas Laws 36 pts. total
Multiple Choice 1 pt Each.
____ 1. Which of the following are properties of an ideal gas?
a. Occupy no volume
b. has random motion
c. has elastic collisions
d. A & C
e. A,B, & C.
____2. With pressure constant, the temperature of a gas is increased from 30 °C
to 90 °C. The volume will
a. triple
b. increase by about 20%
c. decrease by 1/2
d. remain the same
_____3. Standard temperature refers to
a. the temperature at which water boils.
b. the pressure in kPa at Sea level
c. the temperature at which water freezes.
d. the temperature that is normal room temperature.
____ 4. Dalton’s law of partial pressures is which of the following
a. P1V1 = P2V2
b. PTOT = P1 + P2 + P3 +…. PN
c. PV = nRT
d. when something can go wrong, it will go wrong.
____5. STP refers to
a. a type of racing oil
c. 0 °C and 101.325 kPa
d. B & C
b. standard temperature and pressure
_____6. Charles’s law states which of the following:
a. With pressure held constant the Kelvin temperature and volume are directly
proportional.
b. With temperature held constant pressure and volume are inversely related.
c. The total pressure in a container is equal to all of the partial pressures of the gasses
added together.
d. P1V1=P2V2
e. V1/T1=V2/T2
f. A and E
g. B and D
_____7. Boyle’s law states which of the following:
a. With pressure held constant the Kelvin temperature and volume are directly
proportional.
b. With temperature held constant pressure and volume are inversely related.
c. The total pressure in a container is equal to all of the partial pressures of the gasses
added together.
d. P1V1=P2V2
e. V1/T1=V2/T2
f. Both A and E
g. Both B and D
8. 3 pts For the graphs below, state the type of relationship between the two variables.
a.
b.
c.
.
(Through Origin)
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9. 3pts. For the following graphs, draw the relationship between the two variables. Be sure to
draw the line correctly, i.e. if it goes through the origin make sure it goes through the origin.
a. Pressure vs. Volume
b. Volume vs. Temperature
c. Pressure vs. Temperature
For the math problems, be sure to SHOW ALL OF YOUR WORK. This
includes 1) Writing down the equation. 2) Showing the algebra to rearrange
the equation. 3) Units on everything! 4) Sig Figs.
10. 4 pts. An internal combustion engine in a car operates by injecting fuel vapor and air into a
cylinder, compressing the gas with a piston, and igniting the pressurized gas. Suppose an engine
cylinder has a volume of .420 L when the gas is injected. The gas has a temperature of 32 °C and
a pressure of 92.0 kPa. At the time of firing, the piston has compressed the gas and the cylinder
volume is now 0.0494 L, and the gas is at a temperature of 400.0 °C. What is the pressure of the
gas at that time?
11. 4 pts. Maintaining constant pressure, the volume of a gas is increased from 15.0 dm3 to
35.0 dm3 by heating it. If the original temperature was 20.0 °C, what is the new temperature?
12. 5 pts. A chemist collects 96.0 cm3 of gas over water at 27 °C and 122.0 kPa. What volume
would the dry gas occupy at standard pressure?
13. 4 pts. A chemist has three containers. The first is a 2.00 L container which holds Helium.
The second is a 4.00 L container which holds Oxygen. The third is at 8.00 L container which
holds Argon. All three containers are at 18 C and 100.0 kPa. All three gases are then pumped
into a 4.00 L container. The temperature remains constant. What is the total pressure in the final
4.00 L container?
14. Interpolate the vapor pressure of water at 73.4 C 3pts.
15. Using the graph below, what would the volume be when T = -100.0 Celcius?
SHOW WORK!!!!! 3pts.
E.C. 2 pts. Yeast is used to make bread dough rise. The yeast ferments sugar and produces the gas,
carbon dioxide. These bubbles of gas become trapped in the dough. When the bread dough is baked,
the yeast is killed; yet the bread continues to rise as it bakes. Explain why this takes place.