energy transfer

energy transfer

1. in a reaction

2. can be taken in or given out as heat energy

3. combustion

   • exothermic reaction
     • heat is given out
     • exo

4. endothermic reaction

   • takes in heat
   • endo

5. temperature changes

   • helps decide if the reaction is exo or endo

6. energy & bonds

   • energy must be supplied to break bonds
   • energy is always released when bonds are formed
   • in reactions old bonds are broken and new bonds are formed
   • NaCL -ENERGY> Na + CL
     • endo
   • Mg + O -> MgO + ENERGY
     • exo