DP Chemistry (last assessment 2024)

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Question 19M.1.sl.TZ1.5

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.sl.TZ1.5
Level sl Paper 1 Time zone TZ1
Command term Question number 5 Adapted from N/A
5.
[Maximum mark: 1]
19M.1.sl.TZ1.5

Bromine consists of two stable isotopes that exist in approximately a 1 : 1 ratio. The relative atomic mass, Ar, of bromine is 79.90. Which are the stable isotopes of bromine?

A. 79Br and 81Br

B. 80Br and 81Br

C. 78Br and 80Br

D. 79Br and 80Br

[1]

Markscheme

A

Examiners report

Almost 56 % of candidates could find a 1:1 ratio as an average of 2 items, however many had 79Br and 80Br with an average mass of 79.90

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