4.3 Where does energy come from?

  • Created by: Hannah
  • Created on: 13-12-12 19:52
  • Chemical bond- electrical attraction between atoms/ions.
  • Breaking bonds- overcome attractive forces (between nucleus & electrons) , break completely means taht in theory to seperate the atoms/ions til they are infinate distance apart
  • Breaking-Endothermic (takes in energy) (+∆H)
  • Making-Exothermic (gives out energy) (-∆H)
  • If more energy given out in bond making than taken in in bond breaking, then the reaction is exothermic. & vice versa
  • Repulsive Forces occur between nucleus of atoms- increase as they approach each other


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