DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.3c.i

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.sl.TZ0.3c.i
Level sl Paper 2 Time zone TZ0
Command term Label Question number c.i Adapted from N/A
c.i.
[Maximum mark: 2]
22N.2.sl.TZ0.3c.i

Consider the following reaction:

Cu2+ (aq) + Fe (s) → Fe2+ (aq) + Cu (s)

The diagram shows an unlabelled voltaic cell for the reaction:

Cu2+ (aq) + Fe (s) → Fe2+ (aq) + Cu (s)

(c.i)

Label the diagram with the species from the equation and the direction of electron flow.

[2]

Markscheme

all 4 species correctly labelled ✔

arrow showing electron flow from anode to cathode in the external circuit ✔

 

Accept any soluble salt of copper(II) for Cu2+ and any soluble salt of iron(II) for Fe2+.

Do not apply ECF for M2.

Examiners report

Half of the candidates labelled the voltaic cell components and identified the direction of electron flow correctly. The most common mistake was reversing the anode and the cathode components. Other candidates mixed up the components in unusual ways perhaps indicating that they did not have the opportunity to conduct this lab. This question had the highest discrimination index on the paper.

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