What this practice covers
These questions are drawn from past CIE 0620 Chemistry papers and filtered to rate of reaction. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on rate of reaction, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Explaining a temperature rise only as more frequent collisions, leaving out the activation energy.
- Saying a catalyst is used up, or that it increases the yield.
- Drawing a catalysed pathway that lowers the energy of the products.
- Saying "more collisions" when the mark scheme wants "more frequent collisions" or "more collisions per second".
- Raising the plateau of a graph after a change that only speeds the reaction up.
- Using loss of mass to follow a reaction that gives off hydrogen.
- Saying the rate is constant because the average rate is a single number.
- Writing that smaller pieces have more surface area without saying more particles are exposed to collide.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Rate of reaction revision notes.