Question 1

According to the Kinetic Molecular Theory, which of the following statements 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 2

A sample of nitrogen gas occupies a volume of 8.0 L at a pressure of 2.0 atm. If the pressure is decreased to 1.0 atm at constant temperature, what will be the new volume of the gas? (Use Boyle’s Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$16.0\ \mathrm{L}$$

Question 3

Which of the following best describes the relationship between the average kinetic energy of gas molecules and temperature?

Accepted Answer

Average kinetic energy is directly proportional to the Kelvin temperature.

Question 4

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

Accepted Answer

$$273^\circ\mathrm{C}$$

Question 5

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

Accepted Answer

mol

Question 6

A sample of oxygen gas has a volume of 420 mL at $$18^\circ\mathrm{C}. At $$what temperature (in $$^\circ\mathrm{C}) $$will the volume be 640 mL? (Use Charles’s Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$, temperatures in K)

Accepted Answer

$$91^\circ\mathrm{C}$$

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.

Question 8

Which property of a gas is directly related to the force exerted by gas particles colliding with the walls of its container?

Accepted Answer

Pressure

Question 9

If a gas is heated from 200 K to 400 K at constant volume and amount, what happens to the pressure?

Accepted Answer

It is doubled.

Question 10

A sample of gas in a rigid container is cooled from $$300\ \mathrm{K} to$$ $$150\ \mathrm{K}. $$What happens to the pressure, assuming the amount of gas remains constant?

Accepted Answer

The pressure is halved.

Question 11

Which of the following is a correct equality for pressure units?

Accepted Answer

$$1\ \mathrm{atm} = 101.325\ \mathrm{kPa}$$

Question 12

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

Accepted Answer

$$200\ \mathrm{mmHg}$$

Question 13

Which of the following best explains why atmospheric pressure decreases with increasing altitude?

Accepted Answer

There are fewer gas particles at higher altitudes.

Question 14

Which of the following is the correct formula for calculating pressure?

Accepted Answer

$$\mathrm{Pressure} = \frac{\mathrm{Force}}{\mathrm{Area}}$$

Question 15

Which property of a gas must be measured in Kelvin for all gas law calculations?

Accepted Answer

Temperature

Gas Laws and Properties of Gases (Ch. 8: Sections 8.1–8.4)

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