AnswersFL-2003350-Chemistry 1 HonorsThe Ideal Gas Law

The Ideal Gas Law — Unit test Answers

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1
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A gas has a temperature of 273.15 K and a pressure of 101.325 kPa. What can be concluded about the gas?

A
It has reached standard temperature and pressure.
B
The pressure needs to be increased to reach the standard pressure.
C
The temperature needs to be increased to reach the standard temperature.
D
Both the temperature and pressure need to be lowered to reach STP.
2
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Which sequence describes the result of increasing the temperature of a gas in a container?

A
higher kinetic energy ® greater collision force ® higher pressure
B
lower kinetic energy ® greater collision force ® higher pressure
C
higher kinetic energy ® lower collision force ® lower pressure
D
lower kinetic energy ® lower collision force ® lower pressure
3

Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?

A
more gas particles more collisions higher pressure
Option A
B
smaller volume crowded particles less collisions lower pressure
Option B
C
smaller volume crowded particles more collisions higher pressure
Option C
D
more gas particles more kinetic energy more volume higher pressure
Option D
4

A scientist is examining a mixture of nitrogen, hydrogen, and ammonia. The individual pressures that are exerted by nitrogen and hydrogen are 0.26 atm and 0.28 atm, respectively. If the total pressure is 0.90 atm, what is the partial pressure of ammonia?Use .

Question illustration
A
0.27 atm
B
0.36 atm
C
0.54 atm
D
0.90 atm
5

Which law is described by saying that when the pressure of a gas in a sealed container is cut in half, the gas will double in volume at a steady temperature?

A
Boyle’s law
B
Charles’s law
C
Dalton’s law
D
Gay-Lussac’s law
6

A tire at 21°C has a pressure of 0.82 atm. Its temperature decreases to –3.5°C. If there is no volume change in the tire, what is the pressure after the temperature change?Use .

Question illustration
A
0.75 atm
B
0.89 atm
C
1.1 atm
D
1.3 atm
7

What is the volume of 0.200 mol of an ideal gas at 200. kPa and 400. K?Use and .

Question illustration
A
0.83 L
B
3.33 L
C
5.60 L
D
20.8 L
8

Why does changing the volume of a container change the pressure of the gas in it?

A
Changing the volume reduces the number of molecules so they hit the walls of the container less often.
B
Changing the volume reduces the force with which the molecules hit the walls of the container.
C
Changing the volume increases the speed of the molecules so they hit the walls of the container more often.
D
Changing the volume increases the area that the molecules collide with so the force is spread over a larger area.
9

Which quantity is held constant when working with Boyle’s, Charles’s, and Gay-Lussac’s laws?

A
volume
B
moles
C
pressure
D
temperature
10

The ideal gas constant, R has several different values that could be used. Which quantity causes these differences?

A
pressure
B
temperature
C
volume
D
moles
11

The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. According to the ideal gas law, what will most likely happen to the pressure?

A
It will double.
B
It will decrease.
C
It will increase slightly.
D
It will remain the same.
12

The diagrams show gases that are stored in two separate but similar containers.If both gases are at the same temperature, which one has the greater pressure?

Question illustration
A
gas 1 because the particles are moving much faster
B
gas 1 because it has fewer particles that are close together
C
gas 2 because it has more particles that are colliding
D
gas 2 because the particles have more space between them
13

Which statement describes a limitation of the kinetic-molecular theory for a gas?

A
The theory assumes that particles do not experience intermolecular forces.
B
The theory states that pressure is inversely proportional to volume.
C
The theory assumes that particles are in random and continuous motion.
D
The theory states that pressure increases with temperature.
14

Which proportionality shows the result of combining Avogadro’s law with Boyle’s law?

A
mc029-1.jpg
Option A
B
mc029-2.jpg
Option B
C
mc029-3.jpg
Option C
D
mc029-4.jpg
Option D
15

Which units of pressure are equivalent and require no conversion of the value?

A
mmHg and atm
B
kPa and Pa
C
mmHg and torr
D
atm and kPa

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