Question 1

According to the Kinetic Molecular Theory, why do gases exert pressure on the walls of their container?

Accepted Answer

Because gas particles move randomly and collide with the walls, transferring momentum.

Question 2

A sample of nitrogen gas occupies 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 explains why water boils at a lower temperature in the mountains than at sea level?

Accepted Answer

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

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? (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 is NOT a basic property used to describe a gas?

Accepted Answer

Density

Question 6

If the temperature of a gas is doubled from 200 K to 400 K, what happens to the average kinetic energy of the gas particles?

Accepted Answer

It doubles.

Question 7

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 8

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

Accepted Answer

mol

Question 9

A gas is compressed from 10.0 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

$$5.0\ \mathrm{atm}$$

Question 10

Which statement about the volume of a gas is correct?

Accepted Answer

The volume of a gas equals the size of the container it is in.

Question 11

Which property of a gas is directly proportional to its Kelvin temperature, according to the Kinetic Molecular Theory?

Accepted Answer

Average kinetic energy

Question 12

If a gas sample is heated at constant volume, what happens to the pressure?

Accepted Answer

It increases.

Question 13

Which of the following is a correct pressure equality?

Accepted Answer

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

Question 14

A barometer is used to measure which property?

Accepted Answer

Atmospheric pressure

Question 15

Which of the following best describes the relationship between pressure and volume for a gas at constant temperature?

Accepted Answer

Inversely proportional

Gas Laws and Properties: Kinetic Molecular Theory and Fundamental Gas Laws

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