DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.c

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.sl.TZ0.c
Level sl Paper 2 Time zone TZ0
Command term Deduce Question number c Adapted from N/A
c.
[Maximum mark: 1]
22N.2.sl.TZ0.c

Ammonium nitrate, NH4NO3, is used as a high nitrogen fertilizer.

Deduce the Lewis (electron dot) structure for the nitrate anion.

[1]

Markscheme

 ✔

 

Negative charge must be included on square bracket or singly-bonded oxygen atom.

Accept .

Accept any combination of dots/crosses or lines to represent electron pairs.

Examiners report

Only 20% of the candidates scored the mark for the Lewis structure of the nitrate ion. Some candidates had the correct bonds but did not include the charge while a big proportion of candidates made mistakes in drawing the bonds in the ion.

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