What this practice covers
These questions are drawn from past CIE 9701 Chemistry 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.
- Giving an exothermic reaction a positive ΔH because the temperature rose.
- Using the mass of the solute in q = mcΔT rather than the mass of the solution.
- Subtracting the wrong way round in a Hess cycle. Formation goes products minus reactants; combustion goes reactants minus products.
- Forgetting that ΔH<sub>f</sub> of an element is zero.
- Saying bond breaking releases energy. It absorbs it.
- Forgetting that enthalpy of neutralisation is per mole of water, not per mole of acid.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Chemical energetics revision notes.