May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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15CatalysisHard1 mark
The diagram shows a Boltzmann distribution of molecular energies for a gaseous mixture. The distribution has a peak, labelled P.
Boltzmann distribution of molecular energies: number of molecules (vertical axis) against molecular energy (horizontal axis), a curve rising steeply from the origin to a peak labelled P then falling and tailing off toward high energy; a dashed vertical line to the right of the peak marks the activation energy.
What happens when an effective catalyst is added to the mixture?