DP Chemistry (last assessment 2024)
Question 19N.3.hl.TZ0.b(ii)
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.hl.TZ0.b(ii) |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Suggest | Question number | b(ii) | Adapted from | N/A |
b(ii).
[Maximum mark: 1]
19N.3.hl.TZ0.b(ii)
Aspartame is formed from the two amino acids aspartic acid (Asp) and phenylalanine (Phe).
Chromatography is used in the analysis of proteins in the food and pharmaceutical industry.
Suggest why alanine and glycine separate slightly at pH 6.5.
[1]
Markscheme
different sizes/molar masses/chain lengths «so move with different speeds» ✔
NOTE: Do not accept “different side-chains/R-groups/number of carbons”.
