DP Chemistry (last assessment 2024)
Question 18M.3.hl.TZ2.8c
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.hl.TZ2.8c |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Draw | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
18M.3.hl.TZ2.8c
Amino acids are the building blocks of proteins.
(c)
Draw the structures of the main form of glycine in buffer solutions of pH 1.0 and 6.0.
The pKa of glycine is 2.34.
[2]
Markscheme
Penalize charge on incorrect atom once only.
Penalize missing hydrogens or incorrect bond connectivities once only in Option B.
Accept condensed structural formulas.
Accept skeletal structures.
[2 marks]