DP Chemistry (last assessment 2024)

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Question 20N.2.sl.TZ0.a(ii)

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.sl.TZ0.a(ii)
Level sl Paper 2 Time zone TZ0
Command term Justify, State Question number a(ii) Adapted from N/A
a(ii).
[Maximum mark: 1]
20N.2.sl.TZ0.a(ii)

Chlorine undergoes many reactions.

State, giving a reason, whether the chlorine atom or the chloride ion has a larger radius.

[1]

Markscheme

Cl- AND more «electron–electron» repulsion ✔


Accept Cl- AND has an extra electron.

Examiners report

Only half of the candidates deduced that the chloride ion has a larger radius than the chlorine atom with a valid reason. Many candidates struggled with this question and decided that the extra electron in the chloride ion caused a greater attraction between the nucleus and the outer electrons.

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