3.2 Energetics

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Question 37

A chemist compares reaction-profile data from a computer model with temperature measurements for the same reaction.

Measurement	Value
Energy of reactants	125 kJ/mol
Energy of products	161 kJ/mol
Starting temperature of the surroundings	$∘C20.5\ ^{\circ}\mathrm{C}$
Final temperature of the surroundings	$∘C24.0\ ^{\circ}\mathrm{C}$

Calculate the overall energy change for the reaction.

[1]

Evaluate whether the temperature measurements support the reaction-profile data. Use your answer to part (a).

[3]

Markscheme

3.2 Energetics Questions

GCSE
Chemistry
3.2 Energetics

106 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank·3.2 Energetics