DP Chemistry (first assessment 2025)

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Question 21M.2.SL.TZ2.1e

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.SL.TZ2.1e
Level	SL	Paper	2	Time zone	TZ2
Command term	Outline	Question number	e	Adapted from	N/A

e.

[Maximum mark: 1]

21M.2.SL.TZ2.1e

(e)

Outline how one calcium compound in the lime cycle can reduce a problem caused by acid deposition.

[1]

Markscheme

«add» Ca(OH)₂/CaCO₃/CaO AND to «acidic» water/river/lake/soil
OR
«use» Ca(OH)₂/CaCO₃/CaO in scrubbers «to prevent release of acidic pollution» ✓

Accept any correct name for any of the calcium compounds listed.

Syllabus sections

Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.5—Metallic and non-metallic properties show a continuum. This includes the trend from basic metal oxides through amphoteric to acidic non-metal oxides. Deduce equations for the reactions with water of the oxides of group 1 and group 2 metals, carbon and sulfur.