DP Chemistry (last assessment 2024)
Question 20N.3.hl.TZ0.3a
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.3.hl.TZ0.3a |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
20N.3.hl.TZ0.3a
Carbon fibre reinforced plastic (CFRP) is a useful composite. Epoxy is a thermoset polymer that is used as a binding polymer when making CFRP.
(a)
Outline the two distinct phases of this composite.
[2]
Markscheme
carbon fibre reinforcing phase ✔
«in a» matrix phase of epoxy ✔
Award [1 max] for “reinforcing phase «embedded» in a matrix”.
Examiners report
Most had some idea of a composite and tended to gain at least one mark for stating "reinforcing phase embedded in a matrix".
