Ideal Gas Law Review

A gas is contained in a cylinder by a movable piston. The gas is heated so that it expands at constant pressure. How is the force of each collision of a gas particle with the piston affected and how does the frequency of collisions between the gas particles and the piston change?

0625/21/O/N/23

• A

• B

• C

• D

The volume of a fixed mass of gas is varied. The temperature remains constant. Which graph shows how the pressure p of the gas varies with volume V?

0625/22/O/N/23

• A

• B

• C

• D

In an experiment to investigate the relationship between the volume of a sample of air and its pressure, the volume of the sample is decreased and its pressure is measured continuously. Curve X on the graph shows the results that would be expected for a fixed mass of air at constant temperature. Curve Y shows the results that are obtained in this particular experiment.

0625/23/O/N/23

• A

• B

• C

• D

Which graph shows the relationship between the pressure and volume of a fixed mass of gas at constant temperature?

0625/21/M/J/24

• A

• B

• C

• D

A sample of gas is trapped in a rigid container. As the temperature of the gas is increased, the pressure increases. Which statement is not correct?

0625/22/F/M/23

• The gas molecules have greater kinetic energy.

• The gas molecules hit the walls of the container harder.

• The gas molecules hit the walls of the container more frequently.

• The gas molecules move further apart.

A fixed mass of gas is trapped in a container. The temperature of the gas is increased but the volume of the gas is kept constant. How does this change affect the average kinetic energy of the molecules and the pressure on the walls of the container?

0625/21/O/N/22

• A

• B

• C

• D

The pressure of a fixed mass of gas in a cylinder is measured. The volume of the gas in the cylinder is slowly decreased. The temperature of the gas does not change. Which graph shows how the pressure of the gas changes during this process?

0625/22/O/N/22

• A

• B

• C

• D

The conditions of a sample of gas change in two stages.

stage 1 increase of temperature at constant volume

stage 2 increase of volume with no further change of temperature

Which row about the pressure after each stage is correct?

0625/22/M/J/22

• A

• B

• C

• D

A gas in a container is cooled but the volume of the gas does not change. Which row describes the changes in the pressure of the gas and the kinetic energy of the gas particles?

0625/23/M/J/22

• A

• B

• C

• D

The diagram shows gas particles hitting the wall of a container. The system is at room temperature. Why do the gas particles exert a pressure on the wall?

0625/23/M/J/22

• When the particles hit the wall, their momentum changes, which causes a force.

• When the particles hit the wall, their average kinetic energy increases.

• The particles expand when they hit the wall.

• The particles collide with each other.