3.2 Energetics

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Question 5

A manufacturer tests reaction X for use in a sealed chemical cartridge surrounded by water. The cartridge is intended to warm the water.

Quantity	Energy in $kJ/mol\text{kJ/mol}$
Energy needed to break bonds in the reactants	1820
Energy released making bonds in the products	2110

Calculate the energy change for reaction X.

[2]

Use your answer to (a) to explain why reaction X can warm the water. Describe where the products would be shown relative to the reactants on a reaction profile.

[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