CAIE A Level Chemistry 9701 · Reaction kinetics

Reaction kinetics: compare question

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Two experiments are set up for the reaction between aqueous $\ce{Na2S2O3}$ and aqueous $\ce{HCl}$ . In experiment 1, the concentration of $\ce{Na2S2O3}$ is doubled while the volume and the concentration of $\ce{HCl}$ are kept the same. In experiment 2, the pressure of a gaseous reaction is doubled by compressing the mixture to half its volume at constant temperature.

Compare the effect of doubling the concentration of $\ce{Na2S2O3}$ in experiment 1 with the effect of doubling the pressure in experiment 2, in terms of the frequency of effective collisions.

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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.

Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.

Reaction kinetics: compare question

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