Changing the pressure on the reaction
3 marks · EasyConsider a reaction between two gases in a sealed container.
Describe what happens to the rate of reaction if the pressure of the gases is increased.
State why this happens, linking your answer to particle collisions.
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
(a) The rate of reaction increases. · must show rate increases
(b) When pressure increases, gas particles are forced closer together, so they collide more often, increasing the rate. · must show particles closer together, more frequent collisions
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States that the rate increases.
B2 (b) · 1 mark · States that particles are closer together when pressure increases.
B3 (b) · 1 mark · Links to increased frequency of collisions between particles.
Worked solution
a) The rate of reaction increases.
b) Higher pressure forces gas particles closer together, so they collide more frequently, which speeds up the reaction.