Chemistry · Oct / Nov 2021 · Paper 12 · Question 17
5070Exothermic and endothermic reactions
The energy profile diagram of a chemical reaction is shown. [energy profile diagram with axes labelled 'energy' and 'progress of reaction', and labels X, Y, Z] Which statement is correct?
- AThe reaction is exothermic.
- BX represents the activation energy for the reaction.
- CY represents ΔH for the reaction.
- DZ represents the energy given out as the reaction proceeds.
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Correct answer: B. X represents the activation energy for the reaction.
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