Name:    Chapter 14 - The Behaviour of Gases Formative Test

Matching (Value 5)

Match each item with the correct statement below.
 a. Boyle's law e. Gay-Lussac's law b. Charles's law f. ideal gas law c. 453oC g. 553oC d. Graham's law

1.

For a given mass of gas at constant temperature, the volume of the gas varies inversely with pressure.

2.

The volume of a fixed mass of gas is directly proportional to its Kelvin temperature, if the pressure is kept constant.

3.

The pressure of a gas is directly proportional to its Kelvin temperature if the volume is kept constant.

4.

P ´ V = n ´ R ´ T

5.

The Celsius temperature represented by 726 K is calculated to be

Multiple Choice (Value 16)
Identify the choice that best completes the statement or answers the question.

6.

How does the gas propellant move when an aerosol can is used?
 a. from a region of high pressure to a region of lower pressure b. from a region of high pressure to a region of equally high pressure c. from a region of low pressure to a region of higher pressure d. from a region of low pressure to a region of equally low pressure

7.

If a balloon is squeezed, what happens to the pressure of the gas inside the balloon?
 a. It increases. b. It stays the same. c. It decreases. d. The pressure depends on the type of gas in the balloon.

8.

As the temperature of the gas in a balloon decreases, which of the following occurs?
 a. The volume of the balloon increases. b. The average kinetic energy of the gas decreases. c. The gas pressure inside the balloon increases. d. all of the above

9.

What happens to the pressure of a gas inside a container if the temperature of the gas decreases?
 a. The pressure increases. c. The pressure decreases. b. The pressure does not change. d. The pressure cannot be predicted.

10.

Why does air escape from a tire when the tire valve is opened?
 a. The pressure outside the tire is lower than the pressure inside the tire. b. The pressure outside the tire is greater than the pressure inside the tire. c. The temperature is higher outside the tire than inside the tire. d. There are more particles of air outside the tire than inside the tire.

11.

When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____.
 a. move faster b. strike the walls of the container with less force c. decrease in average kinetic energy d. decrease in volume

12.

The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant. How does the gas pressure change?
 a. It increases by a factor of four. c. It increases by a factor of eight. b. It decreases by a factor of eight. d. It increases by a factor of two.

13.

If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
 a. It increases. c. It decreases. b. It stays the same. d. The change cannot be predicted.

14.

When the pressure and number of particles of a gas are constant, which of the following is also constant?
 a. the sum of the volume and temperature in kelvins b. the difference of the volume and temperature in kelvins c. the product of the volume and temperature in kelvins d. the ratio of the volume and temperature in kelvins

15.

If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains constant?
 a. It increases. c. It decreases. b. It stays the same. d. The change cannot be predicted.

16.

What happens when a piston is used to decrease the volume of a contained gas?
 a. Fewer gas particles exert a force on the piston. b. The piston’s pressure on the gas becomes greater than the pressure exerted by the gas on the piston. c. Gas particles become compressed. d. Gas particles leak out of the container.

17.

What does the ideal gas law allow a scientist to calculate that the other gas laws do not?
 a. number of moles c. volume b. pressure d. temperature

18.

At a certain temperature and pressure, 0.20 mol of carbon dioxide has a volume of 3.1 L. A 3.1-L sample of hydrogen at the same temperature and pressure ____.
 a. has the same mass b. contains the same number of atoms c. has a higher density d. contains the same number of molecules

19.

How is the ideal gas law usually written?
 a. = R c. PV = nRT b. = nR d. P =

20.

Which law can be used to calculate the number of moles of a contained gas?
 a. Boyle’s law c. ideal gas law b. combined gas law d. Charles’s law

21.

Under what conditions of temperature and pressure is the behavior of real gases most like that of ideal gases?
 a. low temperature and low pressure c. high temperature and low pressure b. low temperature and high pressure d. high temperature and high pressure

22.

A gas has a volume of 590 mL at a temperature of –55.0C. What volume will the gas occupy at 30.0C?

23.

A 10-g mass of krypton occupies 15.0 L at a pressure of 210 kPa. Find the volume of the krypton when the pressure is increased to 790 kPa.

Formulas

24.

P1V1 = P2V2
P1T2 = P2T1
V1T2 = V2T1
P1V1T2 = P2V2T1
PV=nRT

Molarity (M) = moles/liter