O-LevelChemistryRates of Reaction5070/11 · May/June 2015 · Q151 Mark

The diagram shows the energy profile of a chemical reaction. Two energy changes are labelled X and Y. Which statement about the reaction is correct?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AThe activation energy of the reaction is X + Y.

BThe enthalpy change of the reaction is X.

CThe enthalpy change of the reaction is X + Y.

DThe reaction is exothermic.

✓ Correct answer

D: The reaction is exothermic.

Oracle Prep sorts past-paper questions by topic, so you can drill Rates of Reaction and see which topics are most likely to come up next.

Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2015 Paper 1 Variant 1, question 15.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content