DP Chemistry (last assessment 2024)
Question 20N.3.hl.TZ0.4e
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.3.hl.TZ0.4e |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Justify | Question number | e | Adapted from | N/A |
e.
[Maximum mark: 1]
20N.3.hl.TZ0.4e
There has been significant growth in the use of carbon nanotubes, CNT.
(e)
Experiments have been done to explore the nematic liquid crystal behaviour of CNT. Justify how CNT molecules could be classified as nematic.
[1]
Markscheme
rod-shaped molecules
OR
«randomly distributed but» generally align
OR
no positional order AND have «some» directional order/pattern ✔
Accept “linear” for “rod-shaped”.
Examiners report
Most gained the one mark here, justifying how CNT molecules can be classified as nematic, by stating that they are "rod-shaped molecules".
