DP Chemistry (last assessment 2024)
Question 19N.2.hl.TZ0.6e(iv)
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.2.hl.TZ0.6e(iv) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Justify, Suggest | Question number | e(iv) | Adapted from | N/A |
e(iv).
[Maximum mark: 1]
19N.2.hl.TZ0.6e(iv)
Copper forms two chlorides, copper(I) chloride and copper(II) chloride.
Copper(I) chloride undergoes a disproportionation reaction, producing copper(II) chloride and copper.
2Cu+ (aq) → Cu (s) + Cu2+ (aq)
(e(iv))
Suggest, giving a reason, whether the entropy of the system increases or decreases during the disproportionation.
[1]
Markscheme
2 mol (aq) → 1 mol (aq) AND decreases ✔
NOTE: Accept “solid formed from aqueous solution AND decreases”.
Do not accept 2 mol → 1 mol without (aq).
