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What bond enthalpy calculations do

What bond enthalpy calculations do

Schematic showing a bond being broken with energy in and a bond forming with energy out, plus the summary that total energy to break reactant bonds minus total energy released forming product bonds equals ΔH

Bond enthalpy calculations estimate a reaction enthalpy by comparing the energy needed to break reactant bonds with the energy released when product bonds form. Breaking bonds is always endothermic, while forming bonds is always exothermic.

Bond enthalpies Lesson

  1. A Level
  2. /Chemistry
  3. /Bond enthalpies

Step-by-step lessons on AQA A Level Chemistry Bond enthalpies. Each one builds up to exam-style questions. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.

Lessons