DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ1.4c.i

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.sl.TZ1.4c.i
Level sl Paper 3 Time zone TZ1
Command term Outline Question number c.i Adapted from N/A
c.i.
[Maximum mark: 1]
18M.3.sl.TZ1.4c.i

Both HDPE (high density polyethene) and LDPE (low density polyethene) are produced by the polymerization of ethene.

(c.i)

The production of HDPE involves the use of homogeneous catalysts. Outline how homogeneous catalysts reduce the activation energy of reactions.

[1]

Markscheme

form «temporary» activated complexes/reaction intermediates

 

Accept “consumed in one reaction/step AND regenerated in a later reaction/step”.

Accept “provides alternative mechanism”.

[1 mark]

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