CAIE A Level Chemistry 9701 · Reaction kinetics

Reaction kinetics: explain question

Explain6 marksChallenge

A reaction between two gases is carried out at 25 °C and again at 45 °C. The rate is faster at 45 °C. Using the Boltzmann distribution and the idea of effective collisions, explain why the rate is faster at the higher temperature.

How this question is marked

6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.

Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.

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