DP Chemistry (last assessment 2024)
Question 19M.3.sl.TZ1.4b
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.sl.TZ1.4b |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Suggest | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
19M.3.sl.TZ1.4b
Polybutadiene, used in truck tyres, is a polymer of buta-1,3-diene. The spatial arrangement of atoms in the polymer depends on the type of catalyst used.
(b)
Suggest, giving a reason, how elastomers used for the tyre tread can increase the traction between the tyre and the road.
[2]
Markscheme
elastomers bend under force «and return to original form when force is released»
OR
elastomers make tyre more flexible [✔]
allows greater contact with road [✔]
Examiners report
Whilst some students realised that elastomers would increase the area of road in contact, hardly any linked this to their fundamental property of deforming under stress.
