AnswersTX-Chemistry B-Credit Recovery Summer SchoolUnit Test

Unit Test — Unit test Answers

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If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what would happen to the pressure of the gas?

A
It would increase.
B
It would be halved.
C
It would stay the same.
D
It would slightly decrease.
2
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A thin-walled plastic bottle is sealed at an altitude of 19,000 feet. What would happen to this bottle if it is carried down to 1,000 feet?

A
It will shrink and collapse.
B
It will expand and burst.
C
It will expand but will not burst.
D
It will shrink but maintain its shape.
3

The volume of a gas is 0.450 L when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L?Use .

Question illustration
A
0.225 atm
B
0.444 atm
C
2.25 atm
D
4.44 atm
4

Bromine gas in a container is heated over a flame. What happens to the average kinetic energy of the bromine particles?

A
It decreases rapidly.
B
It increases quickly.
C
It remains the same.
D
It decreases slowly.
5

A perfume bottle is dropped in the corner of a room and it shattered. The odor of the perfume can be detected on the other side of the room. Which statement best describes this observation?

A
Particles are moving from regions of high concentration to low concentration.
B
Particles are moving from regions of low concentration to high concentration.
C
Particles are moving through a small opening into a smaller volume.
D
Particles are moving through a small opening into a larger volume.
6

The incomplete table below shows a comparison of the different gas laws.NameVariablesConstantsEquationBoyle's law pressure, volume? Charles’s lawvolume, temperature??temperature, pressurevolume, moles of gas?pressure, temperature, volume?What is assumed to be constant when using the combined gas law?

Question illustration
A
pressure
B
number of moles
C
volume and moles of gas
D
pressure and temperature
7

Which describes the volume of 1 mol of gas at standard temperature and pressure?

A
The volume is greater for a larger mass of gas.
B
The volume is the same for any gas.
C
The volume depends on the size of the container.
D
The volume varies with the pressure.
8

How many kPa are in 2,150 mmHg?

A
2.83 kPa
B
287 kPa
C
1.61 ´ 104 kPa
D
2.18 ´ 105 kPa
9

The particles of a gas inside a balloon are experiencing an increase in their average kinetic energy and the number of collisions with the wall of the balloon. What is the most likely outcome?

A
higher gas pressure inside the balloon
B
higher air pressure outside the balloon
C
a decrease in gas temperature inside the balloon
D
a large increase in air temperature outside the balloon
10

If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?

A
the molar amount of the gas
B
the partial pressure of the gas
C
the standard temperature and pressure
D
the molar mass
11

Which best defines pressure?

A
a measure of the number of particles in a unit area
B
a measure of the force of the collision of particles on a unit area
C
a measure of the number of particles on the outside of a container
D
a measure of the force of the collision of particles on the inside of a container
12

According to the kinetic-molecular theory, the average kinetic energy of gas particles depends on which factor?

A
volume
B
pressure
C
temperature
D
number of particles
13

Which best defines partial pressure in a mixture of gases?

A
pressure that is exerted by all the gases of a mixture on the container
B
pressure that is exerted by one gas as if it occupied a container by itself
C
half of the pressure that is exerted by the gases of a mixture on the container
D
sum of the individual pressures that are exerted by two or more gases
14

The gas in the piston is at constant temperature. A student increases the pressure on the piston from 2 atm to 3 atm.Which gas law would a student use to investigate this situation?

Question illustration
A
Boyle’s law
B
Charles’s law
C
Gay-Lussac’s law
D
ideal gas law
15

Which statement can best be concluded from the ideal gas law?

A
The product of pressure and volume of an ideal gas is proportional to the absolute temperature.
B
All collisions between atoms or molecules are perfectly elastic and are not the result of any attractive forces.
C
The temperature, pressure, and volume of a gas are all related.
D
The behavior of a gas under real conditions does not obey the ideal gas law.
16

Which change would increase the pressure exerted by a gas?

A
removing gas molecules from the container
B
transferring the gas to a larger container
C
raising the temperature of the gas
D
reducing the force of the molecules hitting the container
17

Which law is described by saying that doubling the absolute temperature will double the pressure of a sample of gas in a rigid container?

A
Boyle’s law
B
Charles’s law
C
Dalton’s law
D
Gay-Lussac’s law
18

A factory at a low elevation ships bags of popcorn to cities at high elevations. Why does the factory manager need to monitor the amount of air in each bag?

A
Too few molecules can cause the bag to collapse and crush the popcorn as it moves from a low pressure to a high pressure.
B
Too many molecules can cause the bag to pop as it moves from a low pressure to a high pressure.
C
Too few molecules can cause the bag to collapse and crush the popcorn as it moves from a high pressure to a low pressure.
D
Too many molecules can cause the bag to pop as it moves from a high pressure to a low pressure.
19

Avogadro’s law and Charles’s law describe a proportionality of the volume of a gas when the pressure is constant. Which describes the proportionality that allows these laws to be combined when describing a gas?

A
Volume is directly proportional to temperature (Avogadro’s law) and to moles (Charles’s law).
B
Volume is inversely proportional to temperature (Avogadro’s law) and to moles (Charles’s law).
C
Volume is directly proportional to moles (Avogadro’s law) and to temperature (Charles’s law).
D
Volume is inversely proportional to moles (Avogadro’s law) and to temperature (Charles’s law).
20

Which statement about gases is true?

A
They are made up of particles that always move very slowly.
B
They are made up of particles that travel in a curved path when in motion.
C
They are made up of hard spheres that vibrate quickly in stationary positions.
D
They are made up of hard spheres that are in random motion.

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