DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.b

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.sl.TZ0.b
Level sl Paper 3 Time zone TZ0
Command term Justify, Predict Question number b Adapted from N/A
b.
[Maximum mark: 1]
19N.3.sl.TZ0.b

Polypropene is used to make many objects including carpets, stationery and laboratory equipment.

Predict, with a reason, whether isotactic or atactic polypropene has the higher melting point.

[1]

Markscheme

isotactic «has higher melting point» AND ordered chains pack more closely
OR
isotactic «has higher melting point» AND stronger intermolecular/London/dispersion forces ✔

NOTE: Accept “van der Waals’ forces”/”vdW”.

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