Question 1

Which of the following best describes the function of a barometer?

Accepted Answer

It measures the atmospheric pressure by the height of mercury pushed up a tube.

Question 2

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

Accepted Answer

0.064 atm

Question 3

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

Accepted Answer

2.80 L

Question 4

Which of the following statements about Boyle’s Law is correct?

Accepted Answer

Pressure and volume are inversely proportional at constant temperature.

Question 5

A 0.845 mol sample of nitrogen gas is at 315 K and 0.920 atm. What is its volume?

Accepted Answer

23.8 L

Question 6

Which of the following is NOT a standard unit of pressure?

Accepted Answer

J

Question 7

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

Accepted Answer

It doubles.

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 best explains why atmospheric pressure is lower at higher altitudes?

Accepted Answer

There is less air above, so the weight of the air column is less.

Question 10

If a gas sample is compressed from 2.0 L to 1.0 L at constant temperature, what happens to its pressure?

Accepted Answer

It doubles.

Question 11

Which of the following is the correct value for the universal gas constant R when using pressure in atm and volume in liters?

Accepted Answer

0.0821 L·atm/(mol·K)

Question 12

A sample of O₂ gas contains 0.50 mol at 1 atm and 25°C. If all of this O₂ is converted to O₃ at the same temperature and pressure, what would be the volume of the ozone produced?

Accepted Answer

8.1 L

Question 13

Which of the following is a correct rearrangement of the ideal gas law to solve for the number of moles (n)?

Accepted Answer

n = PV/RT

Question 14

Which of the following scenarios best illustrates Charles’ Law?

Accepted Answer

A balloon shrinks when placed in a freezer.

Question 15

Which of the following is a correct statement about the relationship between temperature and kinetic energy for gases?

Accepted Answer

As temperature increases, the average kinetic energy of gas molecules increases.

Question 16

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

0.57 mol

Question 17

Which of the following is NOT a postulate of the Kinetic Molecular Theory (KMT) of gases?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 18

If the temperature of a gas is increased from 300 K to 600 K at constant pressure, what happens to the volume?

Accepted Answer

It doubles.

Question 19

Which of the following is a correct conversion factor for pressure?

Accepted Answer

1 atm = 760 mm Hg

Question 20

A gas sample at 1.00 atm and 0.500 L is compressed to 0.250 L at constant temperature. What is the new pressure?

Accepted Answer

2.00 atm

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

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