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Date	May 2014	Marks available	1	Reference code	14M.1.sl.TZ1.18
Level	SL	Paper	1	Time zone	TZ1
Command term		Question number	18	Adapted from	N/A

Question

The diagram represents the Maxwell‒Boltzmann energy distribution curve of the reactants for a chemical reaction with different activation energies, ${E_{{\text{a1}}}}$ and ${E_{{\text{a2}}}}$ .

M14/4/CHEMI/SPM/ENG/TZ1/18

What is the reason why the rate of the reaction with activation energy ${E_{{\text{a2}}}}$ is greater?

A. More frequent collisions between the particles occur.

B. More energetic collisions between the particles occur.

C. A catalyst has been added.

D. The temperature is higher.

Markscheme

Examiners report

The initial wording of the question was thought to be complicated, though it was clear that a catalyst had been added (only possible answer here).

Syllabus sections

Core » Topic 6: Chemical kinetics » 6.1 Collision theory and rates of reaction

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