May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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15Rates ReactionMedium1 mark
The graph shows a Boltzmann distribution for a sample of reacting gas at a temperature K. The activation energy, , for the reaction is marked. Point Q is the point of intercept of the curve with the value of the activation energy, .
  1. 1
    The temperature is increased to K.
  2. 2
    A catalyst is added which increases the rate of the reaction.
As a result of the change in temperature, the shape of the distribution curve will change.
Which point shows the intercept of the new distribution curve with the value of the activation energy for the catalysed reaction?
Boltzmann distribution of number of particles (vertical axis) against molecular energy $E$ (horizontal axis) at temperature $T$ K: a curve rising steeply from the origin to a peak, then falling and tailing off to the right. A dashed vertical line marks the activation energy $E_{A}$ partway down the falling side, crossing the curve at point Q. Four labelled points sit further right along the graph: A sits at an energy less than $E_{A}$, above the curve; B sits exactly on the dashed $E_{A}$ line, above point Q (so above the curve at that energy); C sits at an energy greater than $E_{A}$, above where the curve would be; D sits at a similar energy to C but below the curve, close to the energy axis.