Question 1

A scuba diver releases a 0.75 L air bubble at a depth where the pressure is 2.25 atm. As the bubble rises to the surface, the pressure decreases to 1.03 atm. Assuming temperature remains constant, what is the volume of the bubble at the surface? (Use Boyle’s Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

1.64 L

Question 2

Which of the following best describes the relationship between pressure and volume for a fixed amount of gas at constant temperature, according to Boyle’s Law?

Accepted Answer

They are inversely proportional.

Question 3

A helium balloon has a volume of 2.32 L at 40.0°C. If the temperature rises to 75.0°C at constant pressure, what is the new volume? (Use Charles’s Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$, with temperatures in Kelvin)

Accepted Answer

2.58 L

Question 4

Which law explains why a car tire’s pressure increases on a hot day, assuming the volume of the tire remains constant?

Accepted Answer

Gay-Lussac’s Law

Question 5

A gas at 110 kPa and 30.0°C fills a 2.00 L container. If the temperature increases to 80.0°C and the pressure rises to 440 kPa, what is the new volume? (Use the Combined Gas Law: $$\frac{P_1V_1}{T_1$} = \frac{P_2V_2}{T_2$}$$, with temperatures in Kelvin)

Accepted Answer

0.68 L

Question 6

Which of the following statements about absolute zero is NOT true?

Accepted Answer

It is zero on the Celsius scale.

Question 7

If the pressure on a fixed amount of gas at constant temperature is doubled, what happens to the volume?

Accepted Answer

It decreases by half.

Question 8

Which variables remain constant when applying the formula for Gay-Lussac’s Law ($$\frac{P_1$}{T_1$} = \frac{P_2$}{T_2$}$$)?

Accepted Answer

Amount of gas, volume

Question 9

A gas sample at 3.0 atm and 300 K is cooled to 150 K at constant volume. What is the new pressure? (Use Gay-Lussac’s Law: $$\frac{P_1$}{T_1$} = \frac{P_2$}{T_2$})$$

Accepted Answer

1.5 atm

Question 10

Which law would you use to solve a problem where both the pressure and temperature of a gas change, but the amount of gas remains constant?

Accepted Answer

Combined Gas Law

Question 11

A weather balloon is filled with 500 L of helium at 1.00 atm and 300 K. If the balloon rises to a region where the pressure is 0.50 atm and the temperature is 250 K, what is the new volume? (Use the Combined Gas Law: $$\frac{P_1V_1}{T_1$} = \frac{P_2V_2}{T_2$})$$

Accepted Answer

1000 L

Question 12

Which of the following best describes Charles’s Law?

Accepted Answer

The volume of a gas is directly proportional to its Kelvin temperature at constant pressure.

Question 13

A sealed aerosol can is thrown into a fire. Which gas law explains why the can may explode as it heats up?

Accepted Answer

Gay-Lussac’s Law

Question 14

If a gas occupies 300 mL at 150 K, what volume will it occupy at 300 K, assuming constant pressure? (Use Charles’s Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$})$$

Accepted Answer

600 mL

Question 15

Which of the following is a real-life application of Boyle’s Law?

Accepted Answer

A syringe drawing in liquid when the plunger is pulled back.

Question 16

A gas cylinder contains oxygen at 5.00 atm and 25.0°C. If the temperature drops to -10.0°C at constant volume, what is the new pressure? (Use Gay-Lussac’s Law: $$\frac{P_1$}{T_1$} = \frac{P_2$}{T_2$}$$, with temperatures in Kelvin)

Accepted Answer

4.42 atm

Question 17

Which of the following is NOT a variable in the combined gas law equation?

Accepted Answer

Amount of gas (n)

Question 18

Why must temperatures always be converted to Kelvin when using gas law equations?

Accepted Answer

Kelvin is an absolute scale and avoids negative values, which are not physically meaningful for gas laws.

Question 19

A sample of gas is compressed from 4.0 L to 2.0 L at constant temperature. If the initial pressure was 1.0 atm, what is the final pressure? (Use Boyle’s Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

2.0 atm

Gas Laws: Relationships Among Pressure, Volume, and Temperature

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