DP Chemistry (last assessment 2024)

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Question 22N.2.hl.TZ0.1e

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.hl.TZ0.1e
Level hl Paper 2 Time zone TZ0
Command term Predict Question number e Adapted from N/A
e.
[Maximum mark: 2]
22N.2.hl.TZ0.1e

Ammonium nitrate, NH4NO3, is used as a high nitrogen fertilizer.

(e)

Predict, using the given values, the reaction that would take place at the anode and cathode for the electrolysis of an aqueous solution of ammonium nitrate using graphite electrodes.

[2]

Markscheme

Anode:

H2O (l) → 1/2O2 (g) + 2H+ (aq) + 2e− ✔

 

Cathode:

H+ (aq) + e− → 1/2H2 (g) ✔

 

Do not accept other equations.

Examiners report

A very poorly answered question with the average mark being ~0.6/2. Candidates seemed to be uncertain how to use standard electrode potential data to determine which species were most easily oxidized and reduced, as well as at which electrode electrons were gained and at which they were lost.

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