The gas laws
2 marks · NormalExplain, with reference to particle motion, why increasing the temperature of a gas at constant volume increases the gas pressure.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
When temperature increases, particles move faster and collide with the container walls more often and with greater force, increasing the pressure.
Also accept: Molecules hit the walls more frequently and harder; Greater energy means more forceful collisions
Common mistakes: Just stating temperature rises so pressure rises without referring to particles
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States that particles/molecules move faster when temperature increases
B2 · 1 mark · Explains that more frequent and forceful collisions with walls increase pressure
Worked solution
As temperature increases, the gas particles gain energy and move faster.
This results in more frequent and forceful collisions with the walls, which increases the pressure.