Q: Standard atmospheric pressure is defined as 1 bar. What is this value in pascals?

$$1 \text{ bar} = 100,000 \text{ Pa}$$

Q: Which of the following is a correct conversion for standard atmospheric pressure?

$$1 \text{ atm} = 760 \text{ mm Hg}$$

Question 1

Which of the following statements best describes a characteristic property of gases?

Accepted Answer

Gases are highly compressible and expand spontaneously to fill their containers.

Question 2

A sealed container holds a sample of gas at 350 K. If the temperature is lowered to 150 K at constant pressure, what happens to the volume of the gas?

Accepted Answer

The volume decreases.

Question 3

Which equation correctly expresses Boyle's Law for a fixed amount of gas at constant temperature?

Accepted Answer

$$PV = 	ext{constant}$$

Question 4

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

Accepted Answer

The volume is halved.

Question 5

Which of the following is the correct SI unit for pressure?

Accepted Answer

Pa

Question 6

A mercury barometer measures atmospheric pressure. If the atmospheric pressure increases, what happens to the height of the mercury column?

Accepted Answer

The height increases.

Question 7

Standard atmospheric pressure is defined as 1 bar. What is this value in pascals?

Accepted Answer

$$1 	ext{ bar} = 100,000 	ext{ Pa}$$

Question 8

Which of the following equations expresses Charles's Law?

Accepted Answer

$$V \propto T$$

Question 9

A balloon contains 1 mol of He at STP. If the number of moles is doubled at constant temperature and pressure, what happens to the volume?

Accepted Answer

The volume doubles.

Question 10

Which of the following gases will have the highest density under identical conditions of temperature and pressure?

Accepted Answer

CO$$_2$$

Question 11

The pressure exerted by a gas is defined as force per unit area. Which equation represents this relationship?

Accepted Answer

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

Question 12

A 10.0 L flask is filled with H$$_2$$ gas at 2.0 atm. If the temperature is decreased and the volume remains constant, what happens to the pressure?

Accepted Answer

The pressure decreases.

Question 13

Which of the following is NOT a property of gases?

Accepted Answer

Gases occupy nearly 100% of the volume of their containers.

Question 14

If the temperature of a gas is increased at constant pressure, what happens to the velocity of the gas particles?

Accepted Answer

The velocity increases.

Question 15

Which of the following correctly expresses Avogadro's Law?

Accepted Answer

$$V \propto n$$

Question 16

A graph of pressure vs. volume for a fixed amount of gas at constant temperature will show:

Accepted Answer

A hyperbola (curve) showing inverse relationship.

Question 17

Which of the following is true about the relationship between volume and temperature for a gas at constant pressure?

Accepted Answer

Volume increases as temperature increases.

Question 18

If the number of moles of gas in a container is tripled at constant temperature and pressure, what happens to the volume?

Accepted Answer

The volume is tripled.

Question 19

Which of the following is a correct conversion for standard atmospheric pressure?

Accepted Answer

$$1 	ext{ atm} = 760 	ext{ mm Hg}$$

Question 20

A gas sample is held at constant pressure. If the temperature is doubled, what happens to the volume?

Accepted Answer

The volume doubles.

Study Notes: Gases and Gas Laws (General Chemistry I, Chapter 5)

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