C6

  • Activation energy
    • Minimum amount of energy needed to get a reaction to start. It is shows in a reaction profile as the difference between energy of reactants and peak
    • More needed for endothermic reactions
  • Exothermic reaction
    • Gives out energy to surroundings, increasing in temperature
    • Ex.
      • Burning reactions
      • Detonation of explosives
      • Reaction of acids with metals
    • How to identify them
      • Temperature increases
    • Decrease in energy between reactants and products
  • Endothermic reaction
    • Take in energy from surroundings + causes temperature decreases
    • Rare
    • Ex.
      • Photosynthesis
      • Break down of metal carbonates
      • Dissolving salts in water
    • Extra energy needed
    • Increase in energy between reactants and products
  • Bond changes
    • Breaking bonds between atoms → requires input of energy (endothermic)
    • Forming bonds → releases energy (exothermic)