DP Chemistry (last assessment 2024)

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

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.hl.TZ2.5e
Level hl Paper 3 Time zone TZ2
Command term Outline Question number e Adapted from N/A
e.
[Maximum mark: 1]
19M.3.hl.TZ2.5e

Polymers have a wide variety of uses but their disposal can be problematic.

(e)

Outline, giving a reason, how addition and condensation polymerization compare with regard to green chemistry.

[1]

Markscheme

addition produces only the polymer «AND more green»
OR
addition has no by/side-product/condensation produces by-product/small molecules/HCl/NH3 «AND less green»
OR
addition has high atom economy/condensation has lower atom economy «AND less green»
OR
condensation polymers «often» more biodegradable than addition polymers «AND more green»  [✔]

 

Note: Accept “if water produced by condensation «AND condensation and addition equally green»”.

Accept for addition “all of reactants change into products”.

Examiners report

Candidates seemed to have difficulty in comparing addition and condensation polymerisation with regard to green chemistry.

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