DP Chemistry (last assessment 2024)

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Question 21M.2.sl.TZ2.1e(ii)

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

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

Calcium hydroxide reacts with carbon dioxide to reform calcium carbonate.

Ca(OH)2 (aq) + CO2 (g) → CaCO3 (s) + H2O (l)

(e(ii))

2.85 g of CaCO3 was collected in the experiment in e(i). Calculate the percentage yield of CaCO3.

(If you did not obtain an answer to e(i), use 4.00 g, but this is not the correct value.)

[1]

Markscheme

«2.853.30 × 100 =» 86.4 «%» ✓


Accept answers in the range 86.1-86.4 «%».

Accept “71.3 %” for using the incorrect given value of 4.00 g.

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