In chemical reactions chemical bonds break. Bond breaking takes in energy so it is Endothermic.
Then new bonds are made. bond making gives out energy is it is an Exothermic reaction.
If the energy taken in to break bonds is less than the energy given out making bond the reaction is Exothermic.
If the energy taken in to break bonds is greater than the energy given out making bonds the reaction is Endothermic.
We can work out the energy transfer like this:
Energy transfer= Energy taken in to break bonds - energy given out making bonds
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