#27 - Bond Energies

Edexcel IGCSE Chemistry - The Companion Audio Guide

Understand bond energies: energy level diagrams illustrate exothermic and endothermic reactions, showing enthalpy change (ΔH) and activation energy. Breaking bonds requires energy, making it an endothermic process, while forming bonds releases energy, making it exothermic. Calculate ΔH using bond energies: subtract energy released when bonds form from energy required to break bonds.