A-LevelChemistryChemical energetics9701/12 · May/June 2012 · Q141 Mark

Slaked lime, Ca(OH)2, may be made from limestone, CaCO3. On heating in a lime kiln at 1000°C, limestone decomposes as follows. reaction 1 CaCO3(s) → CaO(s) + CO2(g) Water is then reacted with calcium oxide, CaO, as follows. reaction 2 CaO(s) + H2O(l) → Ca(OH)2(s) What are the enthalpy changes of these reactions?

Aendothermic endothermic

Bendothermic exothermic

Cexothermic endothermic

Dexothermic exothermic

✓ Correct answer

B: endothermic exothermic

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2012 Paper 1 Variant 2, question 14.

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