Question 1

According to the kinetic molecular theory, which of the following statements is TRUE about the behavior of gas particles?

Accepted Answer

Gas particles are in constant motion and collisions between them are completely elastic.

Question 2

Which equation correctly relates pressure, force, and area for a gas in a container?

Accepted Answer

$$P = \frac{F}{A}$$

Question 3

Boyle’s Law describes the relationship between the volume and pressure of a gas. If the pressure on a gas is doubled at constant temperature, what happens to its volume?

Accepted Answer

The volume is halved.

Question 4

Which of the following best explains why increasing the temperature of a gas increases the average speed of its particles?

Accepted Answer

Temperature increases the kinetic energy of the particles.

Question 5

A sample of gas at 1 atm and 1 L is compressed to 0.5 L at constant temperature. What is the new pressure?

Accepted Answer

2 atm

Question 6

Which law states that the volume of a gas is directly proportional to the absolute temperature at constant pressure?

Accepted Answer

Charles’s Law

Question 7

If the number of gas molecules in a container is increased at constant temperature and pressure, what must happen to the volume?

Accepted Answer

The volume must increase.

Question 8

Dalton’s Law of Partial Pressures states that the total pressure of a gas mixture is:

Accepted Answer

The sum of the partial pressures of each gas.

Question 9

Which equation represents the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 10

According to kinetic molecular theory, what is the relationship between the average kinetic energy of gas particles and temperature?

Accepted Answer

Average kinetic energy is directly proportional to temperature in Kelvin.

Question 11

A mixture of gases contains 2 moles of oxygen, 1 mole of nitrogen, and 1 mole of carbon dioxide. If the total pressure is 4 atm, what is the partial pressure of oxygen?

Accepted Answer

2 atm

Question 12

Which of the following statements about real gases is TRUE?

Accepted Answer

Real gases deviate from ideal behavior due to intermolecular forces and the volume of particles.

Question 13

Graham’s Law of Effusion states that the rate of effusion of a gas is inversely proportional to:

Accepted Answer

The square root of its molar mass.

Question 14

If a gas sample is cooled at constant pressure, what happens to its volume according to Charles’s Law?

Accepted Answer

The volume decreases.

Question 15

Which factor in the van der Waals equation accounts for the volume occupied by gas particles themselves?

Accepted Answer

b

Question 16

A gas sample at room temperature and 1 atm has a nitrogen molecule that travels an average of 93 nm before colliding with another molecule. What is this distance called?

Accepted Answer

Mean free path

Question 17

Which of the following is a consequence of the law of conservation of energy in thermochemistry?

Accepted Answer

Energy is always conserved in a chemical change.

Question 18

If the molar mass of an unknown gas is to be determined using Graham’s Law, and it effuses at a rate that is 0.578 times that of oxygen ($$M_{O_2$} = 32 \ g/mol$$), what is the molar mass of the unknown gas?

Accepted Answer

$$M_{unknown} = 96 \ g/mol$$

Question 19

Which of the following best describes an elastic collision between gas particles?

Accepted Answer

Total kinetic energy is conserved before and after the collision.

Question 20

According to kinetic molecular theory, why do heavier gas molecules move slower than lighter ones at the same temperature?

Accepted Answer

Heavier molecules must have a slower average speed to maintain the same kinetic energy as lighter molecules.

6.8-6.10 Kinetic Molecular Theory and Gas Laws

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