Science revision

Energy transfer in reactions

Chemistry revision

  • Chemical reactions can either release or take in heat energy
  • Combustion is an exothermic reaction, in this reaction heat is given out
  • This is shown by a rise in temperature 
  • An example of an exothermic reaction is burning fuels
  • Doing this gives out masses of heat
  • An endorthic reaction, heat is taken in
  • This is shown in the fall in temperature
  • These are less common because they're easier to spot
  • An example of an endorthic reaction is thermal decomposition, this is when heat is supplied to the compound to cause…


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