Question 1

Which of the following statements is NOT an assumption of the kinetic molecular theory of gases?

Accepted Answer

Gas particles experience strong attractive and repulsive forces between each other.

Question 2

A scuba diver ascends too quickly from deep water, risking decompression sickness. This is primarily due to which property of gases?

Accepted Answer

The solubility of gases in blood decreases as pressure decreases, causing dissolved gases to form bubbles.

Question 3

Which equation correctly represents Boyle's Law?

Accepted Answer

$P_1V_1 = P_2V_2$

Question 4

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. If the pressure is increased to 2.0 atm and the temperature is raised to 600 K, what is the new volume?

Accepted Answer

4.0 L

Question 5

Which of the following best explains why helium effuses faster than oxygen at the same temperature?

Accepted Answer

Helium has a lower molar mass, so its average molecular speed is higher.

Question 6

Which of the following is the correct expression for the root mean square speed ($u_{rms}$) of a gas molecule?

Accepted Answer

$u_{rms} = \sqrt{\frac{3RT}{M}}$

Question 7

A mixture contains 2.0 mol of O$_2$ and 3.0 mol of N$_2$ at a total pressure of 5.0 atm. What is the partial pressure of O$_2$?

Accepted Answer

2.0 atm

Question 8

Which of the following best describes the relationship between temperature and kinetic energy for an ideal gas?

Accepted Answer

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

Question 9

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

Accepted Answer

$PV = nRT$

Question 10

A 5.0 L container holds a mixture of gases at 300 K: 1.0 mol of He, 2.0 mol of Ne, and 3.0 mol of Ar. What is the mole fraction of Ne?

Accepted Answer

0.25

Question 11

Which of the following statements about diffusion and effusion is correct?

Accepted Answer

Effusion is the process by which gas molecules escape through a small hole into a vacuum.

Question 12

According to Dalton's Law of Partial Pressures, which equation is correct for a mixture of gases?

Accepted Answer

$P_{total} = P_1 + P_2 + P_3 + \ldots$

Question 13

Which of the following best explains why the pressure inside a football increases when it is left in the sun?

Accepted Answer

The temperature increases, causing the gas molecules to move faster and collide with the walls more frequently.

Question 14

A sample of gas at 1.0 atm and 273 K occupies 22.4 L. What is the molar volume of an ideal gas at STP?

Accepted Answer

22.4 L

Question 15

Which of the following best describes the mean free path of a gas molecule?

Accepted Answer

The average distance a molecule travels between collisions.

Question 16

If the temperature of a gas is doubled at constant pressure, what happens to its volume?

Accepted Answer

The volume doubles.

Question 17

Which of the following is a correct application of Avogadro's Law?

Accepted Answer

At constant temperature and pressure, equal volumes of gases contain equal numbers of molecules.

Question 18

A hospital stores oxygen in a 50.0 L tank at 300 K and 150 atm. How many moles of O$_2$ are present? ($R = 0.0821$ L·atm·mol$^{-1}$·K$^{-1}$)

Accepted Answer

305 mol

Question 19

Which of the following best describes the effect of increasing molar mass on the rate of effusion of a gas?

Accepted Answer

The rate of effusion decreases as molar mass increases.

Question 20

A gas mixture contains 4.0 mol of N$_2$ and 1.0 mol of CO$_2$. If the total pressure is 2.5 atm, what is the partial pressure of CO$_2$?

Accepted Answer

0.5 atm

Chem - Chapter 10 study guide

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