Nuclear energy

It is the potential energy present in the nucleus of an atom , due to forces between the fundamental particles.

For utilization of any type of potential energy, it has to be converted to kinetic energy by some device, since work is done only by bodies possessing kinetic energy

Chemical Energy

It is the potential energy present in a substance due to forces between atoms which form the molecules of the substance. during a chemical change, there is change in chemical energies of substances.