A-LevelChemistryChemical energetics9701/12 · Feb/Mar 2016 · Q321 Mark

The diagram illustrates the enthalpy changes of a set of reactions [Figure showing enthalpy cycle R -> S, T -> S, T -> U, U -> R] Which statements are correct? 1 The enthalpy change for the transformation U → R is +42 kJ mol⁻¹. 2 The enthalpy change for the transformation T → S is endothermic. 3 The enthalpy change for the transformation R → T is −33 kJ mol⁻¹.

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A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

D: 1 only is correct

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2016 Paper 1 Variant 2, question 32.

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