What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to chemical reactions. 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 chemical reactions, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying a catalyst increases the amount of product.
- Saying higher temperature works only because particles collide more often, and missing the energy of the collisions.
- Confusing a steeper curve with a higher final level on a rate graph.
- Saying dissolving is a chemical change.
- Getting OIL RIG backwards.
- Saying an exothermic reaction takes in heat because it feels hot.
- Saying that at equilibrium the reactions have stopped, or that the quantities are equal.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Chemical reactions revision notes.