O-LevelChemistryRates of Reaction5070/12 · Oct/Nov 2021 · Q171 Mark

The energy profile diagram of a chemical reaction is shown. Which statement 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 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.

✓ Correct answer

B: X represents the activation energy for the reaction.

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, Oct/Nov 2021 Paper 1 Variant 2, question 17.

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