DP Chemistry (last assessment 2024)
Question 19N.3.sl.TZ0.b(i)
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.3.sl.TZ0.b(i) |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Determine | Question number | b(i) | Adapted from | N/A |
b(i).
[Maximum mark: 2]
19N.3.sl.TZ0.b(i)
Metals are extracted from their ores by various means.
Aluminium is produced by the electrolysis of alumina (aluminium oxide) dissolved in cryolite.
Determine the percentage of ionic bonding in alumina using sections 8 and 29 of the data booklet.
[2]
Markscheme
electronegativity difference = 1.8 «and average electronegativity = 2.5» ✔
57 «%» ✔
NOTE: Accept any value in the range 52−65 %.
Award [2] for correct final answer.
