AnswersTX-Chemistry BUnit Test

Unit Test — Unit test Answers

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A balloon that had a volume of 3.50 L at 25.0°C is placed in a hot room at 40.0°C. If the pressure remains constant at 1.00 atm, what is the new volume of the balloon in the hot room?Use .

Question illustration
A
2.19 L
B
3.33 L
C
3.68 L
D
5.60 L
22
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Which sequence describes the result of increasing the number of gas particles in a container?

A
fewer collisions ® lower collision force ® lower pressure
B
more collisions ® lower collision force ® lower pressure
C
fewer collisions ® greater collision force ® higher pressure
D
more collisions ® greater collision force ® higher pressure
23

The table describes a gas stored in four different containers. Properties of Stored GasContainerProperties1· Low number of collisions with container walls· Medium average kinetic energy· Large number of particles2· Large number of collisions with container walls· Medium average kinetic energy· Small number of particles with little spaces between them3· Large number of collisions with container walls· High average kinetic energy· Large number of particles with large spaces between them4· Few collisions with container walls· Low average kinetic energy· Small number of particlesWhich container has gas stored at the highest temperature?

A
1
B
2
C
3
D
4
24

An empty plastic bottle is sealed in a cool room and then moved to a very hot room. What can best be stated about the air pressure inside the bottle when the bottle reaches room temperature?

A
It is lower than the pressure on the outside of the bottle.
B
It is higher than the pressure on the outside of the bottle.
C
It is the same as the pressure on the outside of the bottle.
D
It exerts twice the force per unit area as the air pressure outside the bottle.
25

A gas has experienced a small increase in volume but has maintained the same pressure and number of moles. According to the ideal gas law, how has the temperature of the gas changed?

A
It has increased two times.
B
It has increased slightly.
C
It has decreased slightly.
D
It has stayed the same.
26

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).
27

Which law relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions?

A
Boyle’s law
B
Charles’s law
C
ideal gas law
D
combined gas law
28

Which conditions are equal to STP?

A
30°C, 100 kPa
B
–273.15°C, 1 atm
C
0°C, 760 mmHg
D
25°C, 101.325 kPa
29

Consider the proportionality below.What does this best represent?

Question illustration
A
Dalton’s law
B
Charles’s law
C
ideal gas law
D
combined gas law
30

How many atm are in 1,520 mmHg?

A
0.500 atm
B
2.00 atm
C
15.0 atm
D
203 atm
31

What is the temperature of 0.80 mol of a gas stored in a 275 mL cylinder at 175 kPa?Use and .

Question illustration
A
4.6 K
B
7.2 K
C
61 K
D
96 K
32

A container holds 6.4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.24 atm. What is the partial pressure of hydrogen?Use .

Question illustration
A
0.31 atm
B
0.93 atm
C
5.2 atm
D
31 atm
33

A substance is made up of slow-moving particles that have very little space between them. Based on this information, what can most likely be concluded about this substance?

A
It is not a gas because its particles do not move continuously.
B
It is a gas because its particles move continuously in a straight line.
C
It is not a gas because its particles do not have large spaces between them.
D
It is a gas because its particles move in many different directions.
34

A gas cylinder contains 2.0 mol of gas X and 6.0 mol of gas Y at a total pressure of 2.1 atm. What is the partial pressure of gas Y?Use .

Question illustration
A
0.50 atm
B
1.6 atm
C
2.1 atm
D
2.8 atm
35

Which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior?

A
high pressure and low temperatures
B
high pressure and medium temperatures
C
low pressure and low temperatures
D
low pressure and medium temperatures
36

Equal amounts of four gases are placed in identical containers at the temperatures that are noted below.Samples of Gases at Different TemperaturesGasTemperature (°C)P10.2Q25.4R25.9S33.2Molecules of which gas would exert the greatest collision force?

A
gas P
B
gas Q
C
gas R
D
gas S
37

Which is an example of the kinetic-molecular theory not holding true for a gas?

A
The average kinetic energy of particles depends only on the temperature.
B
The particles in a gas travel in straight lines in a continuous, random motion.
C
The attraction between particles causes a gas to condense at low temperatures.
D
The particles in a gas make up a small portion of the total volume of the gas.
38

If the pressure of a gas is 2.42 atm, what is its pressure in kPa?

A
0.00318 kPa
B
0.0239 kPa
C
245 kPa
D
1,840 kPa
39

Which law relates to the ideal gas law?

A
mc004-1.jpg
Option A
B
mc004-2.jpg
Option B
C
mc004-3.jpg
Option C
D
mc004-4.jpg
Option D
40

Which law states that the volume and absolute temperature of a fixed quantity of gas are directly proportional under constant pressure conditions?

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

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