DP Chemistry (last assessment 2024)
Question 22N.2.sl.TZ0.b
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.2.sl.TZ0.b |
| Level | sl | Paper | 2 | Time zone | TZ0 |
| Command term | Describe | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
22N.2.sl.TZ0.b
An organic compound, A, reacts with ethanoic acid to produce B using concentrated sulfuric acid as a catalyst.
Compound A can also react with bromine. Describe the change observed if A is reacted with bromine.
[1]
Markscheme
brown/orange/red/yellow to colourless ✔
Do not accept clear for colourless.
Examiners report
Although it was a straightforward organic question, 22% of the candidates left it blank, indicating less confidence in answering the organic chemistry questions. 40% of the candidates gained the mark for the decolourization of bromine. One of the common mistakes was reversing the colour change and another was using the term "clear" instead of "colourless".
