Bond Energy (AQA A-Level Chemistry): Revision Notes
📚 Revision Notes
1.6.1 Bond Energy
What is Bond Energy?
infoNote
Bond energy (also known as bond enthalpy or bond dissociation energy) is the amount of energy required to break one mole of a specific bond in a molecule in its gaseous state. It is a measure of bond strength in a chemical bond. Bond energies are typically expressed in kilojoules per mole (kJ/mol).
In any chemical reaction, bonds in the reactants are broken, and new bonds are formed to produce the products. Breaking bonds requires energy, while forming bonds releases energy.
Key Ideas
- Breaking bonds: Endothermic process (requires energy).
- Forming bonds: Exothermic process (releases energy). The overall energy change of a reaction depends on the difference between the energy required to break bonds and the energy released when new bonds form.