DP Chemistry (last assessment 2024)
Question 21M.2.sl.TZ2.b
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.sl.TZ2.b |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Apply | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
21M.2.sl.TZ2.b
Oxidation and reduction reactions can have a variety of commercial uses.
Write the equation for the expected overall chemical reaction in (a).
[1]
Markscheme
3Sn2+ (aq) + 2Al (s) → 3Sn (s) + 2Al3+ (aq)
OR
3Sn(NO3)2 (aq) + 2Al (s) → 3Sn (s) + 2Al(NO3)3 (aq) ✓
If half cells are reversed in part-question (a) then the equation must be reversed to award the mark.
Do not penalize equilibrium arrows.
