DP Chemistry (last assessment 2024)

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Question 20N.2.hl.TZ0.a

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.hl.TZ0.a
Level hl Paper 2 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
20N.2.hl.TZ0.a

Nickel catalyses the conversion of propanone to propan-2-ol.

Outline how a catalyst increases the rate of reaction.

[1]

Markscheme

provides an alternative pathway/mechanism AND lower Ea ✔

Accept description of how catalyst lowers Ea (e.g. “reactants adsorb on surface «of catalyst»”, “reactant bonds weaken «when adsorbed»”).

Examiners report

Although fairly well done some candidates did not mention that providing an alternate pathway to the reaction was how the activation energy was lowered and hence did not gain the mark.

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