Question 1

A weather balloon is filled with helium to a volume of 30.0 L at 1.00 atm and 27°C. If the balloon rises to an altitude where the pressure is 0.60 atm and the temperature is -33°C, what will be the new volume of the balloon? (Assume the amount of gas remains constant.)
Correct answer: 50.0 L

Accepted Answer

50.0 L

Question 2

Which of the following best explains why a sealed bag of chips appears inflated when taken to a higher altitude, such as on an airplane?
Correct answer: The pressure outside the bag decreases, so the gas inside expands to balance the pressure difference.

Accepted Answer

The pressure outside the bag decreases, so the gas inside expands to balance the pressure difference.

Question 3

A sample of gas occupies 2.50 L at 1.20 atm. If the pressure is increased to 2.40 atm at constant temperature, what is the new volume?
Correct answer: 1.25 L

Accepted Answer

1.25 L

Question 4

Which of the following statements about atmospheric pressure is correct?
Correct answer: Atmospheric pressure is the force exerted by gas molecules as they strike surfaces.

Accepted Answer

Atmospheric pressure is the force exerted by gas molecules as they strike surfaces.

Question 5

A scuba diver's tank contains 10.0 L of air at 200 atm and 27°C. If the diver releases air into the water at 1.0 atm and 27°C, what volume will the released air occupy? (Assume ideal gas behavior.)
Correct answer: 2000 L

Accepted Answer

2000 L

Question 6

Which of the following conversions is correct for standard atmospheric pressure?
Correct answer: 1 atm = 760 mm Hg

Accepted Answer

1 atm = 760 mm Hg

Question 7

A 5.00 L container holds 0.200 mol of oxygen gas at 27°C. What is the pressure inside the container? (R = 0.0821 L·atm/(mol·K))
Correct answer: 0.97 atm

Accepted Answer

0.97 atm

Question 8

If the temperature of a fixed amount of gas is doubled (in Kelvin) at constant pressure, what happens to the volume?
Correct answer: It doubles.

Accepted Answer

It doubles.

Question 9

A syringe contains 0.050 mol of nitrogen gas at 1.00 atm and 300 K. If an additional 0.050 mol of nitrogen is added at constant pressure and temperature, what is the final volume compared to the initial volume?
Correct answer: It is doubled.

Accepted Answer

It is doubled.

Question 10

A gas sample at 2.00 atm and 300 K occupies 4.00 L. If the pressure is reduced to 1.00 atm and the temperature is increased to 400 K, what is the new volume?
Correct answer: 10.7 L

Accepted Answer

10.7 L

Question 11

Which scenario best illustrates Avogadro's Law?
Correct answer: A balloon expands as more helium is added at constant temperature and pressure.

Accepted Answer

A balloon expands as more helium is added at constant temperature and pressure.

Question 12

A hospital stores oxygen at 3000 psi in a 50.0 L tank. If 10.0 L of oxygen is released at 1.00 atm and 25°C, what is the approximate pressure in psi of the remaining gas, assuming temperature is constant and the tank is rigid? (1 atm = 14.7 psi)
Correct answer: 2940 psi

Accepted Answer

2940 psi

Question 13

Which of the following is NOT a correct application of the gas laws?
Correct answer: Using Charles' Law to relate pressure and temperature at constant volume.

Accepted Answer

Using Charles' Law to relate pressure and temperature at constant volume.

Question 14

A tire is inflated to a pressure of 2.50 atm at 20°C. After driving, the temperature inside the tire rises to 50°C. What is the new pressure, assuming the volume is constant?
Correct answer: 2.74 atm

Accepted Answer

2.74 atm

Question 15

Which of the following best describes the relationship between gas pressure and molecular collisions?
Correct answer: Gas pressure increases as the number of molecular collisions with surfaces increases.

Accepted Answer

Gas pressure increases as the number of molecular collisions with surfaces increases.

Question 16

A 1.00 L flask contains 0.040 mol of a gas at 27°C. What is the pressure in the flask? (R = 0.0821 L·atm/(mol·K))
Correct answer: 0.98 atm

Accepted Answer

0.98 atm

Question 17

A gas cylinder contains 4.00 mol of nitrogen at 2.00 atm and 300 K. If half the gas is removed and the temperature and volume remain constant, what is the new pressure?
Correct answer: 1.00 atm

Accepted Answer

1.00 atm

Question 18

Which of the following is a correct statement about the use of the combined gas law?
Correct answer: It relates pressure, volume, and temperature for a fixed amount of gas.

Accepted Answer

It relates pressure, volume, and temperature for a fixed amount of gas.

Question 19

A laboratory experiment requires a pressure of 500 mm Hg. What is this pressure in atmospheres?
Correct answer: 0.658 atm

Accepted Answer

0.658 atm

Question 20

A gas sample is cooled from 400 K to 200 K at constant pressure. What happens to its volume?
Correct answer: It is halved.

Accepted Answer

It is halved.

Key Concepts in Gas Laws and Atmospheric Pressure

Study Guide - Practice Questions

Study Guide - Flashcards