DP Chemistry (last assessment 2024)
Question 19M.3.sl.TZ1.c(ii)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.sl.TZ1.c(ii) |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Describe | Question number | c(ii) | Adapted from | N/A |
c(ii).
[Maximum mark: 1]
19M.3.sl.TZ1.c(ii)
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.
The trace quantities of dioxins from tyre fires are rarely inhaled and instead settle on the ground.
Describe why this is a health concern.
[1]
Markscheme
taken up by plants, which are eaten by animals «and then further dispersed»
OR
passed on in food chain [✔]
Note: Accept “do not break down and can be remobilised as dust”.
Examiners report
Only a few students linked this to the toxin entering the food chain.
