O-LevelChemistryRates of Reaction5070/11 · May/June 2018 · Q161 Mark

The diagram shows the energy profile for a reaction. Which statements about this reaction are correct? 1 More energy is needed to break the bonds than is released when new bonds are formed. 2 Route 1 and route 2 give the same overall equation for the reaction. 3 Route 2 involves the use of a catalyst. 4 The reaction is exothermic.

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A1, 2 and 3

B1 and 2 only

C2, 3 and 4

D3 and 4 only

✓ Correct answer

C: 2, 3 and 4

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2018 Paper 1 Variant 1, question 16.

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