DP Chemistry (last assessment 2024)
Question 19M.3.sl.TZ2.5a
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.sl.TZ2.5a |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Draw | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
19M.3.sl.TZ2.5a
Polymers have a wide variety of uses but their disposal can be problematic.
(a)
Draw a section of isotactic polychloroethene (polyvinylchloride, PVC) showing all the atoms and all the bonds of four monomer units.
[2]
Markscheme
correct bonding [✔]
Cl atoms all on same side and alternate [✔]
Note: Continuation bonds must be shown.
Award [1 max] if less than or more than four units shown.
Accept a stereo formula with all atoms and bonds shown.
Examiners report
Quite a few candidates scored at least one mark although most either scored both or none for this polymer structure.
