DP Chemistry (last assessment 2024)

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Question 18M.2.hl.TZ1.l.iii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.hl.TZ1.l.iii
Level hl Paper 2 Time zone TZ1
Command term Justify, Outline Question number l.iii Adapted from N/A
l.iii.
[Maximum mark: 2]
18M.2.hl.TZ1.l.iii

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

Outline why TMS (tetramethylsilane) may be added to the sample to carry out 1H NMR spectroscopy and why it is particularly suited to this role.

[2]

Markscheme

acts as internal standard

OR

acts as reference point

 

one strong signal

OR

12 H atoms in same environment

OR

signal is well away from other absorptions

 

Accept “inert” or “readily removed” or “non-toxic” for M1.

[2 marks]

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