DP Chemistry (first assessment 2025)

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Question 23M.2.SL.TZ2.4b

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.SL.TZ2.4b
Level SL Paper 2 Time zone TZ2
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
23M.2.SL.TZ2.4b
(b)

Explain how a substance in the same phase as the reactants can reduce the activation energy and act as a catalyst. 

[2]

Markscheme

forms an intermediate/activated complex ✓
«intermediate/activated complex» dissociates to form product «AND catalyst» ✓

 

Accept correct annotated energy profile for either mark.