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GCSE Combined Science · key term
The energy needed to break one mole of a particular type of chemical bond, usually expressed in kJ/mol. The same magnitude of energy is released when those bonds form.
Used by AQA and Edexcel
Specification 5.5.1.3 · Paper 3
Revise: The Energy Change of ReactionsA bond energy tells you how much energy is needed to break a particular type of bond. Bond energies are usually given in kJ/mol, meaning kilojoules per mole of bonds. Use the same value as the magnitude of energy released when that type of bond forms.
Specification Heat energy changes in chemical reactions · Paper 3, Paper 4
The energy needed to break one mole of a particular type of bond, measured in .
Revise: Heat energy changes in chemical reactionsA larger bond energy means more energy is needed to break that bond. Forming the same bond releases the corresponding amount of energy.
Use the supplied bond energies and the units requested in the question.
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