DP Chemistry (last assessment 2024)

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Question 21M.2.hl.TZ2.1b(iv)

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Date May 2021 Marks available [Maximum mark: 3] Reference code 21M.2.hl.TZ2.1b(iv)
Level hl Paper 2 Time zone TZ2
Command term Sketch Question number b(iv) Adapted from N/A
b(iv).
[Maximum mark: 3]
21M.2.hl.TZ2.1b(iv)

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

Thermodynamic data for the decomposition of calcium carbonate is given.

(b(iv))

Sketch an energy profile for the decomposition of calcium carbonate based on your answer to b(i), labelling the axes and activation energy, Ea.

[3]

Markscheme

endothermic sketch ✓

x-axis labelled “extent of reaction/progress of reaction/reaction coordinate/reaction pathway” AND y-axis labelled “potential energy/energy/enthalpy✓

activation energy/Ea ✓


Do not accept “time” for x-axis.

Syllabus sections