May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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16CatalysisMedium1 mark
The diagram shows the reaction pathway diagram for the reaction between X and Y to form product Z.
reaction pathway diagram: energy on the vertical axis against progress of reaction on the horizontal axis, a curve starting at X + Y, rising over a peak of height Ea, then falling to a lower level Z, with the overall drop marked ΔH
The reaction happens more rapidly if a catalyst is used. How would the diagram change when a catalyst is used?