Question 1

The temperature of a gas in a rigid steel container is increased from 100 K to 200 K. Which of the following is the most likely effect of this change on the other three variables used to describe the behavior of a gas?

Accepted Answer

The pressure of the gas is doubled, while the volume and mass remain constant

Answer

The mass and volume of the gas is halved, while the pressure remains constant.

Answer

The volume of the gas is halved, while the pressure and the mass remain constant.

Answer

The pressure and volume of the gas are doubled, while the mass remains constant.

Question 2

According to the postulates of the kinetic molecular theory, which variable is directly proportional to the kinetic energy of gas molecules?

Accepted Answer

Temperature

Answer

Volume

Answer

Moles

Answer

Pressure

Question 3

When a gas is ideal, there is no loss of energy during collisions. Which postulate of the kinetic molecular theory BEST supports this statement.

Accepted Answer

Collisions between gas particles are elastic.

Answer

The kinetic energy of gas particles is directly proportional to temperature.

Answer

Gas particles are in constant random motion.

Answer

There are no interactive forces between particles of gases.

Question 4

Which postulate of the kinetic molecular theory BEST explains why gases can be compressed?

Accepted Answer

There is empty space between gas particles.

Answer

There is no force of attraction between gas particles.

Answer

Gases are in constant random motion.

Answer

Gas particles move in a straight line until they collide with other matter.

Question 5

Which of the following is NOT a postulate of the Kinetic Molecular Theory?

Accepted Answer

Larger particles exert more pressure at a given temperature.

Answer

There are no attractive or repulsive forces between particles.

Answer

The average speed of particles is proportional to the temperature.

Answer

Particles move in straight lines until the collide with something.

Question 6

Two gas molecules collide together in a box container. Which reaction accurately portrays the kinetic molecular theory?

Accepted Answer

The two molecules will move in different directions without being attracted or repelled by the other.

Answer

The two molecules will either be attracted or repelled by each other depending on the charge of each gas molecule.

Answer

The two molecules will move off in opposite directions because they are repelled by each other.

Answer

The two molecules will stay together because they are attracted to each other.

Question 7

A 0.25 mol sample of neon gas at 18 C and 0.799 atm is heated to 49 C. The new gas pressure is 1.11 atm. What is the change in volume of the neon gas?

Accepted Answer

-1.5 L

Answer

-3.0 L

Answer

+3.0 L

Answer

+1.5 L

Question 8

A sample of methane gas (CH4) with a mass of 58 g is kept in a 1500ml container at a temperature of 100 C. What is the pressure of the gas?

Accepted Answer

8000 kPa

Answer

1700 kPa

Answer

2000 kPa

Answer

1200 kPa

Question 9

The pressure of a sample fo dry air is held at a constant 2.25 atm while the temperature is decreased from 100 C to 7.0 C. The original volume of the sample is 43 L. Which of the following is closest to the final volume of the sample?

Accepted Answer

32 L

Answer

57 L

Answer

3.0 L

Answer

610 L

Question 10

A fixed quantity of gas is placed inside a container of fixed volume at a temperature of 27 C. The gas has a pressure of P.                                                    Which expression (equation) shows the pressure of the gas at 57 C?

Accepted Answer

(330/300) * P

Answer

(57/27) * P

Answer

(300/330) * P

Answer

(27/57) * P

Question 11

Calculate the approximate volume of a 1.5 mole sample of gas at 15.0 C and a pressure of 3.75 atm.

Accepted Answer

9.46 L

Answer

8.65 L

Answer

1.73 L

Answer

5.93 L

Question 12

With pressure, volume, and temperature being known values, the ideal gas law can be used to -

Accepted Answer

calculate the number of moles

Answer

calculate the density

Answer

calculate the chemical formula

Answer

calculate the kinetic energy

Question 13

If the temperature of a gas changes, but the number of moles and volume remains constant, which of the following values must also change?

Accepted Answer

Pressure

Answer

Mass

Answer

Density

Answer

Number of atoms

Question 14

A sample of gas in a rigid container at 30.0 C and 2.00 atm has its temperature increased to 40.0 C. What will be the new pressure?

Accepted Answer

2.07 atm

Answer

6.04 atm

Answer

1.50 atm

Answer

2.67atm

Question 15

What is the new pressure of 150 ml of a gas that is compressed to 50 ml when the original pressure was 3.0 atm and the temperature is held constant?

Accepted Answer

9.0 atm

Answer

11.0 atm

Answer

.90 atm

Answer

1.0 atm

Question 16

The volume of a sample of oxygen is 200.0 ml when the pressure is 3.000atm and the temperature is 37.0 C. What is the new temperature if the volume increases to 400.0 ml and the pressure decreases to 2.000 atm?

Accepted Answer

140.3 C

Answer

413.0 C

Answer

49.33 C

Answer

209.8 C

Question 17

The volume of a gas is 50.0 ml at 20.0 K. What will be the new temperature if the gas is compressed to 10.0 ml under constant pressure?

Accepted Answer

4.00 K

Answer

10.0 K

Answer

100 K

Answer

5.00 K

Question 18

Consider four sealed, rigid containers with the following volumes: 50 ml, 100 ml, 250 ml, and 500 ml. If each of these contains 0.25 moles of helium gas at standard temperature which container would have the greatest pressure?

Accepted Answer

50 ml

Answer

250 ml

Answer

100 ml

Answer

500 ml

Question 19

Solid sodium carbonate reacts with sulfuric acid to produce carbon dioxide gas. During an experiment to produce carbon dioxide gas, a student recorded the following data:                                                                                            Pressure = 708.1 mm Hg                                                                                                                                 Volume = 29.65 mL                                                                                                                                   Temperature= 25.5 C                                                                                                                                  How many moles of Carbon dioxide were produced?

Accepted Answer

0.00113 mol

Answer

88 mol

Answer

0.857 mol

Answer

8.46 mol

Question 20

Observe the red (left) and blue (right) balloons. Both balloons have a temperature of 25.0 C, contain 0.50 moles of gas sealed by the knot at the bottom, and have a volume of 2.2 L.                                                                                                                                       If the red balloon (on the left) is placed in a freezer with a temperature of -5.50 C, which of the following statements regarding the volumes of the balloons is accurate?

Accepted Answer

Balloon A will be smaller due to the gas particles moving slower

Answer

Balloon A will be larger due to lower pressure inside the freezer

Answer

Balloon A will be smaller due to fewer moles of gas in the baloon.

Answer

The balloons will remain unchanged and have equal volume at 2.2 L.

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