Bond Energy Calculations (Higher Tier)

This lesson covers the quantitative calculation of energy changes using bond energy data. Bond energy calculations are a core Higher Tier skill for AQA GCSE Combined Science Trilogy (8464). You will learn the method, work through examples step by step, and practise interpreting your results.

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What Is Bond Energy?

Bond energy is the amount of energy needed to break one mole of a particular covalent bond in a gaseous molecule. It is also the energy released when one mole of that bond forms.

Bond energy is measured in kilojoules per mole (kJ/mol).

Bond	Bond Energy (kJ/mol)
H–H	436
O=O	498
C–H	413
C=O	799
O–H	463
N≡N	945
N–H	391
Cl–Cl	242
H–Cl	432
Br–Br	193
H–Br	366
C–C	347
C=C	614
C–O	358