DP Chemistry (last assessment 2024)

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Question 22N.2.hl.TZ0.f.iv

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

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

In spite of appearing to be aware of the role of the salt bridge, over half the candidates lost these marks by framing their answers in terms of the ions in the electrolyte, rather than those in the salt bridge.

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