DP Chemistry (last assessment 2024)

Question 20N.3.hl.TZ0.d

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.3.hl.TZ0.d
Level	hl	Paper	3	Time zone	TZ0
Command term	Deduce	Question number	d	Adapted from	N/A

[Maximum mark: 1]

20N.3.hl.TZ0.d

$1.57 %$ of the mass of a rock weighing $46.5 kg$ is uranium(IV) oxide, ${UO}_{2}$ . $99.28 %$ of the uranium atoms in the rock are uranium-238, ${}^{238}U$ .

Deduce the nuclear equation for the decay of uranium-238 to thorium-234.

[1]

Markscheme

${}_{92}^{238}U \to {}_{90}^{234}{Th} + {}_{2}^{4}{He}$ ✔

Do not penalize missing atomic numbers in the equation.

Accept “ $α$ ” for " $H e$ ”.

Examiners report

Most scored the one mark for the nuclear equation for the decay of uranium-238 to thorium-234. The most common error was including a neutron on the product side

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Question 20N.3.hl.TZ0.d

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