Question 1

Which statement best describes the kinetic molecular theory of gases?

Accepted Answer

Gas particles move rapidly in straight lines, have negligible attractive forces, and the temperature is proportional to their average kinetic energy.

Question 2

A patient with COPD is given oxygen from a tank. Which property of gases allows the oxygen to fill the entire volume of the tank and reach the patient?

Accepted Answer

Gases expand to fill the volume of their container.

Question 3

Which of the following is NOT a unit used to measure gas pressure?

Accepted Answer

mL

Question 4

If the temperature of a gas is increased at constant volume, what happens to the pressure?

Accepted Answer

The pressure increases.

Question 5

A barometer measures atmospheric pressure. If the mercury column falls, what does this indicate?

Accepted Answer

Atmospheric pressure has decreased.

Question 6

Convert a pressure of 475 mmHg to atmospheres ($$1 	ext{ atm} = 760 	ext{ mmHg}).$$

Accepted Answer

$$0.625 	ext{ atm}$$

Question 7

According to Boyle’s Law, what happens to the volume of a gas if the pressure is doubled at constant temperature and amount?

Accepted Answer

The volume is halved.

Question 8

A sample of oxygen gas has a volume of 12.0 L at 600 mmHg. What is the new pressure if the volume changes to 36.0 L at constant temperature and amount?

Accepted Answer

$$200 	ext{ mmHg}$$

Question 9

Which equation represents Charles’s Law for a gas at constant pressure and amount?

Accepted Answer

$$\dfrac{V_1$}{T_1$} = \dfrac{V_2$}{T_2$}$$

Question 10

A balloon has a volume of 785 mL at $$21^\circC. If $$the temperature drops to $$0^\circC at $$constant pressure, what is the new volume?

Accepted Answer

$$729 	ext{ mL}$$

Question 11

Which of the following best explains why water boils at a lower temperature in the mountains than at sea level?

Accepted Answer

The atmospheric pressure is lower in the mountains, so the vapor pressure of water reaches atmospheric pressure at a lower temperature.

Question 12

Which equation represents the combined gas law?

Accepted Answer

$$\dfrac{P_1$ V_1$}{T_1$} = \dfrac{P_2$ V_2$}{T_2$}$$

Question 13

A sample of helium gas has a volume of 0.180 L, a pressure of 0.800 atm, and a temperature of $$29^\circC. $$What temperature (in $$^\circC) $$will the helium have a volume of 90.0 mL and a pressure of 3.20 atm?

Accepted Answer

$$331^\circC$$

Question 14

According to Avogadro’s Law, what happens to the volume of a gas if the number of moles is tripled at constant temperature and pressure?

Accepted Answer

The volume triples.

Question 15

What is the molar volume of a gas at STP?

Accepted Answer

$$22.4 	ext{ L}$$

Question 16

How many grams of He are present in 8.00 L of gas at STP? ($$1 	ext{ mole He} = 4.00 	ext{ g}$$, $$1 	ext{ mole} = 22.4 	ext{ L} at $$STP)

Accepted Answer

$$1.43 	ext{ g}$$

Question 17

Which equation is used to calculate the pressure, volume, temperature, or amount of a gas using the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 18

A scuba tank contains O$$_2$$ with a pressure of 0.450 atm and He at 855 mmHg. What is the total pressure in mmHg in the tank?

Accepted Answer

$$1197 	ext{ mmHg}$$

Question 19

During breathing, which gas law explains why air flows into the lungs during inhalation?

Accepted Answer

Boyle’s Law, because increasing lung volume decreases pressure, causing air to flow in.

Chapter 8: Gases – Properties and Kinetic Molecular Theory

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