What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to chemical energetics. 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 energetics, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying an endothermic reaction makes the surroundings warmer.
- Describing a temperature rise as endothermic because "energy is being made".
- Saying bond breaking releases energy.
- Explaining why a reaction is exothermic by saying it gives out heat, without mentioning bonds.
- Giving a positive ΔH for an exothermic reaction.
- Calculating bonds made minus bonds broken instead of the other way round.
- Forgetting to multiply the bonds by the numbers in the balanced equation.
- Saying a higher concentration makes particles collide with more energy.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Chemical energetics revision notes.