DP Chemistry (last assessment 2024)
Question 19M.3.sl.TZ2.15a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.sl.TZ2.15a |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Predict | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19M.3.sl.TZ2.15a
A student synthesized aspirin, acetylsalicylic acid, in a school laboratory.
(a)
Predict one absorption band present in an infrared (IR) spectrum of aspirin, using section 26 of the data booklet.
[1]
Markscheme
Any one of:
1050–1410 «cm–1 due to C–O» [✔]
1700–1750 «cm–1 due to C=O in acids and esters» [✔]
2500–3000 «cm–1 due to O–H in acids» [✔]
2850–3090 «cm–1 due to C–H in alkanes and arenes» [✔]
Examiners report
This was a very well answered question. Even weak candidates were able to identify one correct wavenumber.
