Question 1

Which of the following best describes the function of a barometer in atmospheric pressure measurements?

Accepted Answer

It measures the force exerted by atmospheric gases by the height of a mercury column.

Question 2

A pressure of 49 torr is equivalent to which of the following values in atmospheres?

Accepted Answer

0.064 atm

Question 3

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

Accepted Answer

The volume is halved.

Question 4

A sample of gas occupies 2.58 L at 15°C and 1 atm. What volume will it occupy at 38°C and 1 atm?

Accepted Answer

2.91 L

Question 5

Which of the following is the correct value for the universal gas constant R in the units used for the ideal gas law?

Accepted Answer

0.0821&#xA0;L&#xA0;atm/mol&#xA0;K

Question 6

If you have 0.845 mol of nitrogen gas at 315 K and 0.920 atm, what is the volume occupied by the gas?

Accepted Answer

23.8 L

Question 7

Which of the following statements about the relationship between temperature and kinetic energy is correct according to the Kinetic Molecular Theory?

Accepted Answer

The average kinetic energy of gas molecules is directly proportional to the absolute temperature.

Question 8

A sample of methane gas with a volume of 38 mL at 5°C is heated to 86°C at constant pressure. What is the new volume?

Accepted Answer

49 mL

Question 9

Which of the following is NOT a correct unit for measuring pressure?

Accepted Answer

Joules (J)

Question 10

If the volume of a gas is directly proportional to the number of moles at constant temperature and pressure, which law does this describe?

Accepted Answer

Avogadro's Law

Question 11

A gas sample at STP occupies 22.4 L. How many moles of gas are present?

Accepted Answer

1 mol

Question 12

Which of the following scenarios best illustrates Charles' Law?

Accepted Answer

A balloon expands as it is heated.

Question 13

A sample of 0.50 mol O2 at 1 atm and 25°C is converted completely to ozone (O3) at the same temperature and pressure. What is the final volume of ozone produced?

Accepted Answer

0.33 mol O3 × 24.5 L = 8.1 L

Question 14

Which of the following is a correct rearrangement of the ideal gas law to solve for pressure?

Accepted Answer

P=nRTV

Question 15

Which of the following best explains why atmospheric pressure is lower at higher altitudes?

Accepted Answer

There are fewer air molecules above the surface exerting downward force.

Question 16

A gas sample is compressed from 2.0 L to 1.0 L at constant temperature. If the initial pressure was 1.0 atm, what is the final pressure?

Accepted Answer

2.0 atm

Question 17

Which of the following is a real-world application of the ideal gas law?

Accepted Answer

Calculating the amount of air needed to inflate a car tire to a specific pressure.

Question 18

Which of the following is the correct conversion factor between atmospheres and torr?

Accepted Answer

1 atm = 760 torr

Question 19

A sample of hydrogen gas occupies 8.56 L at 0°C and 1.5 atm. How many moles of hydrogen are present?

Accepted Answer

1.50.0821&#xD7;8.56273 = 0.57 mol

Gases and Gas Laws: Pressure, Volume, Temperature, and the Ideal Gas Law

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