Chemistry: Matter and Change

Chapter 13: Gases

Standardized Test Practice

1
A gas occupies 2.0 L at STP. What volume will the gas occupy if the pressure is increased to 2.0 atm, and the temperature is kept constant?
A)1.0 L
B)4.0 L
C)0.50 L
D)2.0 L
2
When will the molecules of all samples of ideal gases have the same average kinetic energies?
A)at constant volume
B)at constant temperature
C)at constant amount
D)at constant pressure
3
A sample of gas is held in a 10.0-L volume at 175 kPa. The temperature is kept constant while the volume is decreased until the pressure is 350 kPa. What is the new volume of the gas?
A)1.0 L
B)5.0 L
C)10.0 L
D)175 L
4
At constant pressure, a sample of 1 liter of gas is heated from 27 degrees Celsius to 127 degrees Celsius. What is the final volume?

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A)0.75 L
B)0.21 L
C)4.7 L
D)1.3 L
5
A sample of gas starts at 1.00 atm, 0.00 degrees Celsius, and 30.0 mL. What is the volume if the temperature increases to 127 degrees Celsius and the pressure decreases to 0.500 atm?

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A)0.0113 mL
B)87.9 mL
C)22.0 mL
D)41.0 mL
6
How can the molar volume of a gas be defined?

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A)the volume that one mole occupies at STP
B)the volume that one gram occupies at STP
C)the volume that one mole occupies at 100°C and 1 atm pressure
D)the volume that one gram occupies at 100°C and 1 atm pressure
7
What will happen to a real gas when the temperature is lowered and the pressure is raised?
A)The gas eventually condenses to become a liquid.
B)The gas does not change.
C)The gas expands.
D)The number of gas particles doubles.
8
What is the molar mass of a gas if 0.104 g of the gas occupies 48.7 mL at STP?
A)28.2 g/mol
B)34.5 g/mol
C)40.0 g/mol
D)47.9 g/mol
9
In the Ideal Gas Law equation, the units of R will commonly change based on different units of ________.

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A)pressure
B)volume
C)temperature
D)moles
10
Which of the following gases will behave most like an ideal gas?

PV = nRT
A)H2O
B)He
C)C4H10?
D)NH3
11
Determine the Celsius temperature of 1.50 moles of ammonia contained in a 10.0-L vessel under a pressure of 2.0 atm.
A)-110°C
B)162°C
C)-50°C
D)0.0°C
12
A 10.0-L vessel contains gas A at a pressure of 300.0 torr. A 3.00-L vessel contains gas B at a pressure of 400.0 torr. Gas A is forced into the second vessel. Calculate the resulting pressure in torr. Assume the temperature remains constant.
A)1000 torr
B)1400 torr
C)1800 torr
D)2000 torr
13
Astronauts exhale carbon dioxide, a potentially deadly gas. Lithium hydroxide can absorb carbon dioxide from the air inside a spaceship via the reaction shown above. What volume of carbon dioxide at STP can be absorbed by 5.00 g LiOH?

CO2 + 2LiOH yields Li2CO3 + H2O
A)2140 l
B)4.68 l
C)2.34 l
D)1070 l
14
Glucose, C6H12O6, reacts with oxygen to give carbon dioxide and water. What volume of oxygen at 20 degrees Celsius and 0.99 atm must be breathed to react with 726 grams of glucose.

C6H12O6 + 6O2 yields 6CO2 + 6H2O
A)590 l
B)40 l
C)7130 l
D)98 l
15
Nitrogen changes from a liquid to a gas at -196 degrees Celsius. Find the volume of gas at STP produced by 0.50 kg of liquid nitrogen.

N2(l) yields N2(g)
A)100 l
B)200 l
C)300 l
D)400 l
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