Sources of traditional chemical energy

Chemical reaction can be said to be the breaking and recombination of chemical bonds.

Breaking bonds is to absorb energy, and bonding is to release energy.

There must be a difference between bonding and bond breaking in the whole reaction, and the final result is to reflect the endothermic and exothermic processes we feel.

First of all, you should know something about the material structure.

I hope it helps you.