Q: A 1.50 L sample of methane gas exerts a pressure of 1650 mm Hg. What is the final pressure if the volume changes to 7.00 L at constant temperature?

$$P_2$$ = \frac{P_1V_1}{$$V_2$$} = \frac{1650\ mm\ Hg \times 1.50\ L}{7.00\ L} = 354\ mm\ Hg$$

Question 1

According to the Kinetic Molecular Theory of Gases, which of the following statements is TRUE about the behavior of gas molecules?

Accepted Answer

Gas molecules move in straight lines in all directions and their collisions are elastic.

Question 2

Which property of gases explains why a helium-filled balloon will eventually deflate even if it is not punctured?

Accepted Answer

Gases mix completely with other gases in the same container.

Question 3

A sample of air at sea level has a pressure of 760 mm Hg. What is this pressure in atmospheres ($$atm$$)?

Accepted Answer

$$1.00\ atm$$

Question 4

If the volume of a gas is decreased while the temperature remains constant, what happens to the pressure?

Accepted Answer

The pressure increases.

Question 5

Which equation correctly represents Boyle’s Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 6

A 1.50 L sample of methane gas exerts a pressure of 1650 mm Hg. What is the final pressure if the volume changes to 7.00 L at constant temperature?

Accepted Answer

$$P_2$$ = \frac{P_1V_1}{$$V_2$$} = \frac{1650\ mm\ Hg 	imes 1.50\ L}{7.00\ L} = 354\ mm\ Hg$$

Question 7

Which of the following best describes why atmospheric pressure decreases at higher altitudes?

Accepted Answer

There are fewer air molecules above the surface at higher altitudes.

Question 8

A balloon is cooled from room temperature to $$-196^	ext{o}C$$ using liquid nitrogen. According to Charles’ Law, what happens to the volume of the balloon?

Accepted Answer

The volume decreases.

Question 9

Convert $$35^	ext{o}C to $$Kelvin using the correct formula.

Accepted Answer

$$K = ^	ext{o}C + 273 = 35 + 273 = 308\ K$$

Question 10

Which of the following is NOT a property of gases?

Accepted Answer

Gases have a definite shape.

Question 11

A scuba diver inhales air from a tank at high pressure deep underwater and swims quickly to the surface while holding their breath. What is the most likely physiological consequence?

Accepted Answer

The air in the lungs will expand rapidly, possibly causing lung damage.

Question 12

Which of the following equations correctly expresses Charles’ Law?

Accepted Answer

$$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$

Question 13

If the number of gas molecules in a sealed container is doubled while the volume and temperature remain constant, what happens to the pressure?

Accepted Answer

The pressure doubles.

Question 14

Which of the following best explains why gases have low densities compared to liquids?

Accepted Answer

There is a lot of empty space between gas molecules.

Question 15

A gas sample has a pressure of 699 mm Hg. What is the pressure in atmospheres ($$atm$$)? ($$1\ atm = 760\ mm\ Hg)$$

Accepted Answer

$$0.92\ atm$$

Question 16

Which of the following is the correct formula for converting Kelvin temperature to Celsius?

Accepted Answer

$$^	ext{o}C = K - 273$$

Question 17

Which of the following statements about the Kelvin scale is FALSE?

Accepted Answer

The Kelvin scale uses the unit 'degrees Kelvin'.

Chapter 13: Gases – Properties, Laws, and Applications

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