DP Chemistry (last assessment 2024)

Test builder »

Question 20N.2.sl.TZ0.4a

Select a Test
Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.sl.TZ0.4a
Level sl Paper 2 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
20N.2.sl.TZ0.4a

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

(a)

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

A straight-forward question, however, half of the candidates only mentioned the lower activation energy and did not mention that this is through an alternative mechanism, so did not score the mark.

Syllabus sections