DP Chemistry (last assessment 2024)
Question 20N.3.sl.TZ0.6b(ii)
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.3.sl.TZ0.6b(ii) |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | b(ii) | Adapted from | N/A |
b(ii).
[Maximum mark: 2]
20N.3.sl.TZ0.6b(ii)
Phospholipids are a main component of cell membranes.
(b(ii))
State the most significant intermolecular forces in the phospholipid in b(i).
[2]
Markscheme
Forces occurring between components labelled A:
hydrogen/ bonding
OR
ion–dipole
OR
ionic/electrostatic «repulsion and/or attraction» ✔
Accept “dipole-dipole” for M1.
Do not accept “van der Waals/vdW” for M1.
Forces occurring between components labelled B:
dispersion/London/instantaneous dipoles/temporary dipoles ✔
Accept “van der Waals/vdW” for M2.
Examiners report
Many good answers. Those that failed to score often provided the inverted answer. Dipole-dipole was fairly common for M1 but VdW forces less so for M2.