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This lesson covers Higher Tier content for AQA GCSE Chemistry. You will learn what bond energies are, how to use bond energy data to calculate the overall energy change of a reaction, and how to determine whether a reaction is exothermic or endothermic from bond energy values. This is a quantitative skill that is frequently tested in the Higher Tier exam papers.
Bond energy (also called bond enthalpy or bond dissociation energy) is the amount of energy needed to break one mole of a particular type of covalent bond. It is measured in kJ/mol (kilojoules per mole).
The same amount of energy is released when the same type of bond is formed.
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