DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ2.4a

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Date May 2019 Marks available [Maximum mark: 3] Reference code 19M.3.hl.TZ2.4a
Level hl Paper 3 Time zone TZ2
Command term Determine Question number a Adapted from N/A
a.
[Maximum mark: 3]
19M.3.hl.TZ2.4a

Metals are extracted from their ores by several methods, including electrolysis and reduction with carbon.

(a)

Determine the mass of aluminium, in g, that could be extracted from an appropriate solution by a charge of 48 250 C. Use sections 2 and 6 of the data booklet.

[3]

Markscheme

moles of electrons «= 48250  C 96500  C mo l − 1 » = 0.5000 «mol»   [✔]

moles of aluminium «= 0.5000  mol 3 » = 0.1667 «mol»  [✔]

mass of aluminium «= 26.98 g mol–1 × 0.1667 mol» = 4.50 «g»  [✔]

 

Note: Award [3] for correct final answer.

Examiners report

Many candidates did reasonably well in this question but some struggled with the number of electrons required.

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