DP Chemistry (last assessment 2024)

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

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

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.iv)

Predict the movement of all ionic species through the salt bridge.

[2]

Markscheme

NO3– to anode/Fe/left ✔

K+ «and Fe2+» to cathode/Cu/right ✔

 

Accept other specific anions in addition to nitrate for M1.

Award [1 max] for “anions/negative ions to anode AND cations/positive ions to cathode”.

Examiners report

This was a challenging question for the candidates. Many candidates did not identify K+ and NO3– as the ions in the salt bridge and only discussed the flow of the Fe2+ and Cu2+ ions. The average mark was 0.5 out of a total of 2 marks.

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