O-LevelChemistryRates of Reaction5070/11 · May/June 2016 · Q171 Mark

The diagram shows an energy profile diagram for a chemical reaction, both with and without a catalyst. Which energy change is the activation energy for the catalysed reaction?

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AThe activation energy of the uncatalysed reaction.

BThe activation energy of the catalysed reaction.

CThe enthalpy change of the reaction (reactants to products).

DThe energy of the reactants.

✓ Correct answer

B: The activation energy of the catalysed reaction.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2016 Paper 1 Variant 1, question 17.

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