Q: Which of the following is a correct pressure equality?

$$1\ \text{atm} = 760\ \text{mmHg}$$

Question 1

According to the Kinetic Molecular Theory, what happens to the average kinetic energy of gas molecules when the temperature is doubled from 200 K to 400 K?

Accepted Answer

The average kinetic energy is doubled.

Question 2

A sample of oxygen gas has a volume of 12.0 L at a pressure of 600 mmHg. If the volume is increased to 36.0 L at constant temperature and amount, what is the final pressure of the gas? Use Boyle’s Law: $$P_1V_1 = P_2V_2.$$

Accepted Answer

$$P_2 = 200$$\ 	ext{mmHg}$$

Question 3

Which of the following best explains why gases are easily compressed?

Accepted Answer

The actual volume occupied by gas molecules is extremely small compared to the volume the gas occupies.

Question 4

A sample of gas has a volume of 420 mL at 18°C. At what temperature (in °C) will the volume be 640 mL, assuming constant pressure and amount? Use Charles’s Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}.$$

Accepted Answer

121°C

Question 5

Which of the following units is NOT commonly used to measure gas pressure?

Accepted Answer

mL

Question 6

A gas has a pressure of 645 Torr at 128°C. What is the temperature (in °C) if the pressure increases to 824 Torr, assuming constant volume and amount? Use Gay-Lussac’s Law: $$\frac{P_1$}{T_1$} = \frac{P_2$}{T_2$}.$$

Accepted Answer

273°C

Question 7

Why does water boil at a lower temperature in the mountains than at sea level?

Accepted Answer

The atmospheric pressure is lower at higher altitudes, so water molecules need less energy to escape into the gas phase.

Question 8

Which property of a gas is directly proportional to its Kelvin temperature, according to Charles’s Law?

Accepted Answer

Volume

Question 9

If the pressure on a gas is increased while temperature and amount remain constant, what happens to the volume of the gas?

Accepted Answer

The volume decreases.

Question 10

Which of the following is a correct pressure equality?

Accepted Answer

$$1\ 	ext{atm} = 760\ 	ext{mmHg}$$

Question 11

A scuba diver descends to a depth where the pressure is 3.0 atm. If the diver inhales 2.0 L of air at the surface (1.0 atm), what will be the volume of the air in the diver’s lungs at depth, assuming constant temperature? Use Boyle’s Law: $$P_1V_1 = P_2V_2.$$

Accepted Answer

0.67 L

Question 12

Which of the following statements about the behavior of gases is FALSE according to the Kinetic Molecular Theory?

Accepted Answer

Gas particles have strong attractive forces between them.

Question 13

A weather balloon is filled with 5.0 L of helium at 25°C. If the temperature rises to 55°C at constant pressure, what will be the new volume of the balloon? Use Charles’s Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}.$$

Accepted Answer

5.5 L

Question 14

Which of the following best describes the relationship between pressure and temperature in Gay-Lussac’s Law?

Accepted Answer

Pressure is directly proportional to temperature (in Kelvin).

Question 15

If a gas is cooled from 300 K to 150 K at constant pressure, what happens to its volume according to Charles’s Law?

Accepted Answer

The volume is halved.

Question 16

Which of the following is NOT a property used to describe a gas?

Accepted Answer

Color

Question 17

A tire is inflated to a pressure of 32 psi at 20°C. After a long drive, the temperature inside the tire increases to 50°C. What happens to the pressure inside the tire, assuming the volume remains constant?

Accepted Answer

The pressure increases.

Question 18

Which of the following is the correct formula for Boyle’s Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Gas Laws and the Behavior of Gases

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