DP Chemistry (last assessment 2024)

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Question 18M.2.hl.TZ1.1e.i

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.hl.TZ1.1e.i
Level hl Paper 2 Time zone TZ1
Command term Suggest Question number e.i Adapted from N/A
e.i.
[Maximum mark: 1]
18M.2.hl.TZ1.1e.i

Urea, (H2N)2CO, is excreted by mammals and can be used as a fertilizer.

(e.i)

Suggest one reason why urea is a solid and ammonia a gas at room temperature.

[1]

Markscheme

Any one of:

urea has greater molar mass

urea has greater electron density/greater London/dispersion

urea has more hydrogen bonding

urea is more polar/has greater dipole moment

 

Accept “urea has larger size/greater van der Waals forces”.

Do not accept “urea has greater intermolecular forces/IMF”.

 

[1 mark]

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