DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ1.3a(ii)

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.hl.TZ1.3a(ii)
Level hl Paper 2 Time zone TZ1
Command term State Question number a(ii) Adapted from N/A
a(ii).
[Maximum mark: 1]
22M.2.hl.TZ1.3a(ii)

Ammonia is produced by the Haber–Bosch process which involves the equilibrium:

N2 (g) + 3 H2 (g) ⇌ 2 NH3 (g)

The percentage of ammonia at equilibrium under various conditions is shown:

[The Haber Bosch Process [graph] Available at: https://commons.wikimedia.org/wiki/File:Ammonia_yield.png
[Accessed: 16/07/2022].]

(a(ii))

State how the use of a catalyst affects the position of the equilibrium.

[1]

Markscheme

same/unaffected/unchanged ✔

Examiners report

Good performance; however, some misread the question as asking for the effect of a catalyst on equilibrium, rather than on the position of equilibrium.

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