DP Chemistry (first assessment 2025)
Question EXM.1B.SL.TZ0.2c
| Date | May Example question | Marks available | [Maximum mark: 2] | Reference code | EXM.1B.SL.TZ0.2c |
| Level | SL | Paper | 1B | Time zone | TZ0 |
| Command term | Suggest | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
EXM.1B.SL.TZ0.2c
(c)
Suggest why water was chosen to extract ascorbic acid from the spinach leaves with reference to its structure.
[2]
Markscheme
«ascorbic acid» has multiple −OH/hydroxyl groups ✔
can H-bond with water ✔
Do not accept OH−/hydroxide for M1
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.8—The nature of the force that exists between molecules is determined by the size and polarity of the molecules. Intermolecular forces include London (dispersion), dipole-induced dipole, dipole–dipole and hydrogen bonding. Deduce the types of intermolecular force present from the structural features of covalent molecules.