DP Chemistry (last assessment 2024)
Question 18M.3.hl.TZ1.d.ii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.hl.TZ1.d.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.d.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.
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]
