DP Chemistry (last assessment 2024)

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Question 22N.1.hl.TZ0.27

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.hl.TZ0.27
Level hl Paper 1 Time zone TZ0
Command term Apply Question number 27 Adapted from N/A
27.
[Maximum mark: 1]
22N.1.hl.TZ0.27

Which species can act both as a Lewis acid and a Lewis base?


A.  H2O

B.  NH4+

C.  Cu2+

D.  CH4

[1]

Markscheme

A

Examiners report

Nearly 65% of candidates correctly identified water as being able to act as both a Lewis acid and a Lewis base. Cu2+ (C) was the most favoured of the distractors and gaining this mark seemed to be only weakly related to overall performance.

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