What this practice covers
These questions are drawn from past CIE 9701 Chemistry papers and filtered to reaction kinetics. 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 reaction kinetics, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying a catalyst lowers the energy of the reaction. It lowers the activation energy only, and ΔH is unaffected.
- Explaining the temperature effect purely by faster movement. The dominant reason is the larger proportion of molecules exceeding Eₐ.
- Drawing a Boltzmann curve that starts above the origin, or one that does not cross the original curve.
- Saying a catalyst shifts the Boltzmann curve. It moves the activation energy line instead.
- Saying a catalyst increases the yield at equilibrium. It only gets there faster.
- Forgetting orientation. Energy alone does not make a collision successful.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Reaction kinetics revision notes.