DP Chemistry (last assessment 2024)

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

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

Limestone can be converted into a variety of useful commercial products through the lime cycle. Limestone contains high percentages of calcium carbonate, CaCO3.

(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.

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