DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ2.5a

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.hl.TZ2.5a
Level hl Paper 3 Time zone TZ2
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 2]
19M.3.hl.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

Few candidates scored at least one mark although most either scored both or none for this polymer structure. Some did not read that only four monomer units are required.

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