DP Chemistry (last assessment 2024)
Question 20N.3.hl.TZ0.15a
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.3.hl.TZ0.15a |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Deduce | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
20N.3.hl.TZ0.15a
Aspirin is formed by reacting salicylic acid with ethanoic anhydride. The structure of aspirin is given in section 37 of the data booklet.
(a)
Deduce the structural formula of the by-product of this reaction.
[1]
Markscheme
OR
✔
Accept full OR condensed structural formula.
Examiners report
Most candidates were able to deduce a correct structural formula (either full or condensed) for ethanoic acid. A minority did not read the question fully and gave the structure of aspirin instead of the by-product of the reaction. Another incorrect answer cited as the by-product was water.
