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CAIE A Level Chemistry 9701 · Reaction kinetics

Reaction kinetics: compare question

Compare5 marksStandard

A student investigates the reaction between aqueous hydrogen peroxide and acidified aqueous potassium iodide, which produces iodine. In Experiment 1, 25 cm3 of 0.050 mol dm−3^{-3} hydrogen peroxide is mixed with 10 cm3 of acidified potassium iodide solution. In Experiment 2, 25 cm3 of 0.10 mol dm−3^{-3} hydrogen peroxide is mixed with 10 cm3 of the same acidified potassium iodide solution. All other conditions are identical. Compare the initial rate of reaction in Experiment 1 with that in Experiment 2, and explain your answer in terms of the frequency of collisions and effective collisions.

0 words · 5 marks

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5 marks, so the mark scheme is looking for about 5 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.

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