Question 1

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

Accepted Answer

There are fewer air molecules above the surface, resulting in less weight exerted by the air column.

Question 2

A barometer is used to measure atmospheric pressure. If the atmospheric pressure increases, what happens to the height of the mercury column in the barometer?

Accepted Answer

The height of the mercury column increases.

Question 3

Which of the following is equivalent to 1 atm of pressure?

Accepted Answer

All of the above

Question 4

A sample of gas occupies $$2.50\ 	ext{L} at$$ $$1.00\ 	ext{atm}$$ and $$300\ 	ext{K}. If $$the pressure is increased to $$2.00\ 	ext{atm}$$ and the temperature is raised to $$400\ 	ext{K}$$, what is the new volume of the gas? (Assume ideal behavior.)

Accepted Answer

$$1.88\ 	ext{L}$$

Question 5

Which law states that the volume of a gas is directly proportional to its temperature (in Kelvin) at constant pressure?

Accepted Answer

Charles's Law

Question 6

A weather balloon is filled with $$5.00\ 	ext{L} of $$helium at $$1.00\ 	ext{atm}$$ and $$273\ 	ext{K}. If $$the balloon rises to a region where the pressure is $$0.500\ 	ext{atm}$$ and the temperature is $$223\ 	ext{K}$$, what will be the new volume of the balloon?

Accepted Answer

$$6.12\ 	ext{L}$$

Question 7

Which of the following best describes Avogadro's Law?

Accepted Answer

At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles.

Question 8

A sample contains $$0.50\ 	ext{mol} of$$ $$O_2$$ gas at $$25^	ext{o}C$$ and $$1.00\ 	ext{atm}. $$What volume does it occupy? ($$R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K})$$

Accepted Answer

$$12.2\ 	ext{L}$$

Question 9

Which of the following is the correct form of the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 10

A $$0.85\ 	ext{mol}$$ sample of nitrogen gas is at a pressure of $$699.2\ 	ext{torr}$$ and a temperature of $$315\ 	ext{K}. $$What is its volume? ($$R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K})$$

Accepted Answer

$$23.8\ 	ext{L}$$

Question 11

If the pressure on a gas sample is doubled while the temperature and amount of gas remain constant, what happens to the volume?

Accepted Answer

The volume is halved.

Question 12

Which of the following is NOT an assumption of the ideal gas law?

Accepted Answer

Gas particles lose energy during collisions.

Question 13

A gaseous sample contains $$0.50\ 	ext{mol} of $$argon at $$150^	ext{o}C$$ and $$560\ 	ext{torr}. If it is $$heated to $$250^	ext{o}C at $$constant pressure, what is the change in volume?

Accepted Answer

$$+3.0\ 	ext{L}$$

Question 14

Which of the following scenarios would cause the atmospheric pressure to be highest?

Accepted Answer

At sea level on a humid day

Question 15

A sample of methane gas with a volume of $$38\ 	ext{L} at$$ $$5^	ext{o}C is $$heated to $$96^	ext{o}C at $$constant pressure. What is the new volume?

Accepted Answer

$$49.0\ 	ext{L}$$

Question 16

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

Accepted Answer

They are inversely proportional.

Question 17

A $$1.52\ 	ext{L}$$ sample of $$SO_2$$ gas is at a pressure of $$5.6 	imes 10^4$\ 	ext{Pa}. If $$the pressure is increased to $$1.5 	imes 10^5$\ 	ext{Pa} at $$constant temperature, what is the new volume?

Accepted Answer

$$0.57\ 	ext{L}$$

Question 18

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.

General Chemistry Study Notes: Gases

Study Guide - Practice Questions

Study Guide - Flashcards