DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.b.ii
| Date | November 2017 | Marks available | [Maximum mark: 1] | Reference code | 17N.3.sl.TZ0.b.ii |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Deduce | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 1]
17N.3.sl.TZ0.b.ii
The development of materials with unique properties is critical to advances in industry.
Low density polyethene (LDPE) and high density polyethene (HDPE) are both addition polymers.
One of the two infrared (IR) spectra is that of polyethene and the other of polytetrafluoroethene (PTFE).
Deduce, with a reason, which spectrum is that of PTFE. Infrared data is given in section 26 of the data booklet.
[1]
Markscheme
B AND absence «of absorption of» C–H at 2850–3090 «cm–1»
OR
B AND presence of «absorption of» C–F at 1000–1400 «cm–1»
