Energy Transfer in Reactions

This video explains what happens with energy transfer in reactions

Breaking Bonds

Chemical reactions involve the making and breaking of bonds.
Energy must be taken in so that bonds can be broken.
Energy is given out when new bond are made.
E_Ais the activation energy this is the energy required to break the bond of the reactants.
AH is the energy (enthalpy) change of the reaction if it is negative energy is given out if it is positive energy is taken in.
In an exothermic reaction more energy is released making new bonds than is taken in breaking bonds.
In an endothermic reaction less energy is released making new bonds than is taken in breaking bonds.

The energy change of a reaction can be calculated using the following formula:

AH = Energy used in breaking bonds- Energy given out in making bonds

Remember for a particular bond the energy for breaking and making it is the same.

This video explains more about breaking bonds

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