topic c5- energy changes

• exothermic reactions

  energy EXITS the reaction, into the surroundings
• examples of exothermic reactions

  • burning fuels (combustion)
  • acid + alkali (neutralisation)
• real life uses of exothermic reactions

  • hand warmers
  • self heating cans
• endothermic reactions

  energy ENTERS the reaction, from the surroundings
• examples of endothermic reactions

  • thermal decomposition
  • citric acid + sodium hydrogencarbonate
• real life uses of endothermic reactions

  • sport injury packs (ice packs)
• reaction profiles

  
• reaction profiles

  
• activation energy

  the energy required to start the reaction
• exothermic reactions

  lose energy
• endothermic reactions

  gain energy
• if total bond energies of the reactant is greater than products

  the reaction is endothermic