DP Chemistry (last assessment 2024)

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

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

Chlorine undergoes many reactions.

The mass spectrum of chlorine is shown.

NIST Mass Spectrometry Data Center Collection © 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

Outline the reason for the two peaks at m/z=35 and 37.

[1]

Markscheme

«two major» isotopes «of atomic mass 35 and 37» ✔

Examiners report

About 60% of the candidates recognized that the peaks at m/z 35 and 37 in the mass spectrum of chlorine are due to its isotopes. A few students wrote 'isomers' instead of 'isotopes'.

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