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Question 18N.2.sl.TZ0.6b

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.sl.TZ0.6b
Level sl Paper 2 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
18N.2.sl.TZ0.6b

Butanoic acid, CH3CH2CH2COOH, is a weak acid and ethylamine, CH3CH2NH2, is a weak base.

(b)

Explain why butanoic acid is a liquid at room temperature while ethylamine is a gas at room temperature.

[2]

Markscheme

Any two of:
butanoic acid forms more/stronger hydrogen bonds ✔
butanoic acid forms stronger London/dispersion forces ✔
butanoic acid forms stronger dipole–dipole interaction/force ✔

 

Accept “butanoic acid forms dimers”

Accept “butanoic acid has larger Mr/hydrocarbon chain/number of electrons” for M2.

Accept “butanoic acid has larger «permanent» dipole/more polar” for M3.

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