Exothermic & endothermic

• reaction profile

  A) Exothermic

  
• Reaction profile

  A) Endothermic

  
• Exothermic when reactants energy > products energy
• Endothermic when reactants energy < product energy
• Endothermic - breaking bonds
• Exothermic - creating bonds
• Exothermic bond is negative

  Endothermic bond is positive