DP Chemistry (last assessment 2024)

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Question 19M.3.sl.TZ2.a

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

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

Determine the mass of aluminium, in g, that could be extracted from an appropriate solution by a charge of 48250 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 × 0.1667mol» = 4.50 «g»  [✔]

 

Note: Award [3] for correct final answer.

Examiners report

Many students scored at least one point typically the 1st mark with many obtaining the 2nd and 3rd marks as well. If students struggled it was typically with the second mark where the number of electrons was required.

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