DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ1.3b(iii)

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

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].]

One factor affecting the position of equilibrium is the enthalpy change of the reaction.

(b(iii))

Demonstrate that your answer to (b)(i) is consistent with the effect of an increase in temperature on the percentage yield, as shown in the graph.

[2]

Markscheme

increased temperature decreases yield «as shown on graph» ✔

shifts equilibrium in endothermic/reverse direction ✔

Examiners report

Good performance; some did not relate that increased temperature decreases yield «as shown on graph» and others arrived at incorrect shift in equilibrium for the reaction.

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