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Question 18M.3.hl.TZ1.5d.ii

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.hl.TZ1.5d.ii
Level hl Paper 3 Time zone TZ1
Command term Outline Question number d.ii Adapted from N/A
d.ii.
[Maximum mark: 1]
18M.3.hl.TZ1.5d.ii

Aluminium is produced by the electrolysis of a molten electrolyte containing bauxite.

The graph of the resistance of aluminium with temperature is shown below.

M18/4/CHEMI/HP3/ENG/TZ1/05.d

(d.ii)

Outline why the resistance of aluminium increases above 1.2 K.

[1]

Markscheme

collisions between electrons and «lattice of metal» ions become more frequent

OR

thermal oscillations/vibrations disrupt the Cooper electron pairs

[1 mark]

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