Chemical Energy is defined as the potential of a chemical substance to undergo a transformation through a chemical reaction. In simple terms it is the energy that can be released or absorbed because of a reaction between a set of chemical substances.

•          This energy that has been released or absorbed is equal to the difference between the energy content of the products and the reactants, provided the initial and final temperatures are equal.

•          Under constant volume, the internal energy change during a chemical process is equal to the heat exchanged.

•          Under constant pressure, the measured heat change need not necessarily be equal to the internal energy change, because pressure-volume work also releases or absorbs energy.

Most of the energy releases or absorption is by breaking or making of chemical bonds and these energies can be estimated from the bond energies of the various chemical bonds in the reactants and products.

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