DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ1.b.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.sl.TZ1.b.i
Level sl Paper 3 Time zone TZ1
Command term Compare and contrast Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
18M.3.sl.TZ1.b.i

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

Compare and contrast the structures of HDPE and LDPE.

[2]

Markscheme

both have «long» hydrocarbon chains

OR

both have chains comprising CH2 units

 

HDPE has little/no branching AND LDPE has «more» branching

 

Accept “CH2–CH2 units”.

Accept “HDPE more crystalline”.

[2 marks]

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