DP Chemistry (last assessment 2024)

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Question 20N.2.hl.TZ0.4b

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.2.hl.TZ0.4b
Level hl Paper 2 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
20N.2.hl.TZ0.4b

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

(b)

Explain why an increase in temperature increases the rate of reaction.

[2]

Markscheme

more/greater proportion of molecules with E Ea ✔

greater frequency/probability/chance of collisions «between the molecules»
OR
more collision per unit of time/second ✔

Examiners report

Almost all candidates earned at least 1 mark for the effect of temperature on rate. Some missed increase in collision frequency, others the idea that more particles reached the required activation energy.

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