Bond Energies

• The bond energy is the amount of energy required to break one mole of bonds.
• In an exothermic reaction energy is released to the surroundings so the temperature increases.
• Examples of an exothermic reaction include:

  • combustion
  • neutralisation
  • respiration
  • displacement
• In an endothermic reaction energy is absorbed from the surroundings so the temperature decreases.
• Examples of an endothermic reaction include:

  • thermal decomposition
  • photosynthesis
• The scientific term for burning is combustion.
• The products of complete combustion are carbon dioxide and water.
• Any reaction that requires heat to work is endothermic
• All neutralisation reactions are exothermic.