DP Chemistry (last assessment 2024)

Question 22N.2.sl.TZ0.3b

Date	November 2022	Marks available	[Maximum mark: 1]	Reference code	22N.2.sl.TZ0.3b
Level	sl	Paper	2	Time zone	TZ0
Command term	Show	Question number	b	Adapted from	N/A

[Maximum mark: 1]

22N.2.sl.TZ0.3b

Consider the following reaction:

Cu²⁺ (aq) + Fe (s) → Fe²⁺(aq) + Cu (s)

(b)

The mass spectrum for copper is shown:

^{Source: WebElements, n.d. Copper: isotope data [online] Available at:}
^{https://www.webelements.com/copper/isotopes.html [Accessed 6 October 2021].}

Show how a relative atomic mass of copper of 63.62 can be obtained from this mass spectrum.

[1]

Markscheme

$\frac{(63 \times 69) + (65 \times 31)}{100}$

$65 x + (1 - x) 63 = 63.62$ AND $x = 0.31 / 31$ «%» AND $1 - x = 0.69 / 69$ «%» ✔

Examiners report

A very well answered question. 70% of the candidates were able to show how the relative atomic mass of copper could be calculated using data from the mass spectrum given. Some candidates did not obtain the same value of the relative atomic mass because they did not read the percentage abundance accurately (69% and 31%). 11% of the candidates did not attempt the question.

Syllabus sections

Core

Core » Topic 2: Atomic structure » 2.1 The nuclear atom

Core » Topic 2: Atomic structure

Question 22N.2.sl.TZ0.3b

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