What intermolecular interactions occur when...?

Question

a) a container of gas in compressed to a smaller volume at constant temperature.

b) a container of gas has more gas added into the same volume at constant temperature.

c) the gas in a container of variable volume is heated at constant pressure.

Answer 1

a. The molcules have more collisions with the walls per second, because there is less surface area. The pressure goes up.

b. More molecules hit the same surface area per second, so the pressure goes up.

c. The molecules gain kinetic energy, so hit the walls harder and more often, which incresases the internal pressure. The container will expand until the internal pressure equals the external pressure.