Q: Which of the following is the correct conversion factor between atm, kPa, and mmHg?

$$1\ \text{atm} = 101.3\ \text{kPa} = 760\ \text{mmHg}$$

Question 1

Which of the following best describes what happens to the pressure of a gas if the volume of its container is doubled, assuming temperature and number of particles remain constant?

Accepted Answer

The pressure will be halved.

Question 2

A 30 mL container of gas at 5°C is compared to a 30 mL container of gas at 60°C. Which statement is correct about the molecular speed in the two containers?

Accepted Answer

Molecules move faster at 60°C than at 5°C.

Question 3

What is the value of standard temperature and pressure (STP) in chemistry?

Accepted Answer

$$0\ ^\circ C (273 K) $$and 1 atm

Question 4

Which equation represents the combined gas law?

Accepted Answer

$$P_1V_1/T_1$ = P_2V_2/T_2$

Question 5

If a gas is heated at constant volume, what happens to the pressure inside the container?

Accepted Answer

The pressure increases.

Question 6

Which of the following is the correct conversion factor between atm, kPa, and mmHg?

Accepted Answer

$$1\ 	ext{atm} = 101.3\ 	ext{kPa} = 760\ 	ext{mmHg}$$

Question 7

Which law states that equal volumes of different gases at the same temperature and pressure contain the same number of particles?

Accepted Answer

Avogadro's Law

Question 8

A 60 mL container of gas at 60°C contains more molecules than a 30 mL container of gas at 60°C. What can be inferred about the pressure, assuming both containers are sealed and at the same temperature?

Accepted Answer

The pressure is the same in both containers.

Question 9

Which equation is used to calculate the pressure of a gas when the number of moles, temperature, and volume are known?

Accepted Answer

$$PV = nRT$$

Question 10

A gas sample is compressed from 2.0 L to 1.0 L at constant temperature. What happens to the pressure?

Accepted Answer

The pressure doubles.

Question 11

Which of the following best describes the relationship between the number of gas particles and pressure, assuming constant volume and temperature?

Accepted Answer

Pressure increases as the number of particles increases.

Question 12

A gas at 1 atm and 273 K is heated to 546 K at constant volume. What is the new pressure?

Accepted Answer

$$2\ 	ext{atm}$$

Question 13

Which of the following is NOT a difference between the ideal gas law and the combined gas law?

Accepted Answer

The combined gas law includes the gas constant $$R.$$

Question 14

If the temperature of a gas is increased while the volume is held constant, what happens to the average kinetic energy of the gas molecules?

Accepted Answer

It increases.

Question 15

A gas occupies 4.0 L at 300 K and 2.0 atm. What will be its volume at 1.0 atm and 300 K?

Accepted Answer

$$8.0\ 	ext{L}$$

Question 16

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

Accepted Answer

A downward curve (hyperbola)

Question 17

A gas sample at 1 atm and 273 K is compressed to half its original volume at constant temperature. What is the new pressure?

Accepted Answer

$$2\ 	ext{atm}$$

Question 18

Which of the following statements about Avogadro's Law is correct?

Accepted Answer

Equal volumes of different gases at the same temperature and pressure contain the same number of particles.

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