Gas Behavior Practice Questions

1. If a gas has a constant volume and its temperature triples, what happens to the pressure of the gas?

The pressure will be 3 times lower

The volume will be 3 times higher

The pressure will be 3 times higher

The volume will be 3 times lower

Question 1 of 15

2. Which of these temperatures is the coldest?

1,000,000 °F

220 K

32 °F

-20 °C

Question 2 of 15

3. Which layer of our atmosphere is warmed up because it absorbs ultraviolet radiation?

Stratosphere

Mesosphere

Thermosphere

Troposphere

Exosphere

Question 3 of 15

4. A gas expands (volume increases). What is happening with its molecules to change its pressure?

(check all that apply)

Pressure decreases

Molecules are getting closer together

Molecules are colliding with the container more often

Molecules are getting farther apart

Pressure increases

Molecules are colliding with the container less often

Question 4 of 15

A gas in a constant volume container has a starting temperature of 200 K, and it is at atmospheric pressure. If the temperature is increased to 800 K, what is the new pressure?

0.25 atm

Not enough information provided in problem.

4 atm

1 atm

Question 5 of 15

Which statements about the thermosphere are true?

(check all that apply)

This is the coldest layer of the atmosphere

The air in this layer is extremely thin

The temperature in this layer increases as you go up

This layer is exposed to direct sunlight

We live in this layer

The ozone layer is located in this layer

Question 6 of 15

7. Which atmospheric layer do we live in?

Troposphere

Stratosphere

Exosphere

Mesosphere

Thermosphere

Question 7 of 15

8. If the pressure of a gas sample gets 7 times higher, what happens to its volume?

(Check each true statement)

Pressure and volume are directly related

The volume gets 7 times smaller

$P_1 V_1 = P_2 V_2$

$\cfrac{P_1}{V_1} = \cfrac{P_2}{V_2}$

The volume gets 7 times larger

Pressure and volume are inversely related

Question 8 of 15

9. When a balloon is heated, it expands. During this process, the pressure outside the balloon is constant at 1 atm. What is happening with the molecules to cause the balloon to get bigger?

(Check all that apply)

Molecules collide with the inside of the balloon with greater force

Pressure inside the balloon goes up

Molecules get farther apart

Molecules move faster

Molecules get closer together

Question 9 of 15

10. If marshmallows are put in a vacuum chamber and the vacuum pump is turned on, the marshmallows will expand. During this process, what is happening with the air molecules outside the marshmallows (but inside the glass chamber)?

Vacuum Marshmallow Man

(Check all that apply)

Each time a molecule hits the marshmallow, it collides with less force

The total number of air molecules is decreasing

The air pressure is decreasing

The air molecules are moving slower

The air molecules collide with the marshmallows less frequently

The air molecules are getting farther apart

Question 10 of 15

11. When moist air rises to form clouds, what is happening with the air molecules?

(Check all that apply)

Lower pressure / less collisions between molecules

Higher pressure / more collisions between molecules

Air is getting colder / molecules are moving slower

Water molecules are going from liquid to gas

Molecules are getting closer together

Molecules are getting farther apart

Water molecules are going from gas to liquid

Air is getting warmer / molecules are moving faster

Question 11 of 15

12. If a gas sample has a starting temperature of 27 °C and its volume is doubled, what would the new temperature be?

13.5 °C

327 °C

150 K

54 °C

Question 12 of 15

13. 3.0 L of a gas start out with a pressure reading of 120 kPa. When the volume is reduced to 2.0 L, what is the new pressure?

20 kPa

0.05 kPa

80 kPa

180 kPa

Question 13 of 15

14. When you breathe in, what happens with the air molecules in your lungs?

(check all that apply)

Number of air molecules in your lungs increases

Molecules in your lungs get farther apart

Air flows from high pressure to low pressure

Pressure in your lungs increases

Volume of air inside lungs decreases

Question 14 of 15

15. A balloon has a starting volume of 6 L.

Then the balloon’s temperature is tripled, and its pressure is cut in half.

What is the new volume of the balloon?

36 L

4 L

9 L

1 L

Question 15 of 15