DP Chemistry (last assessment 2024)

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

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.sl.TZ0.3c.iii
Level sl Paper 2 Time zone TZ0
Command term Outline Question number c.iii Adapted from N/A
c.iii.
[Maximum mark: 1]
22N.2.sl.TZ0.3c.iii

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.iii)

The diagram includes a salt bridge that is filled with a saturated solution of KNO3. Outline the function of the salt bridge.

[1]

Markscheme

«keep» each half-cell/electrolyte «electrically» neutral ✔

 

Accept balance charges/ions.

Accept allow ion flow «between cells».

Examiners report

The majority of the candidates outlined the function of the salt bridge. One of the common answers that did not score the mark was that the salt bridge allowed electrons to flow (without mentioning ions).

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