Which explains why more energy is released in nuclear reactions than in chemical reactions?

No. molecular bonds are broken in nuclear reactions.
Chemical reactions are always endothermic.
In nuclear reactions, mass is converted to energy.
Protons and neutrons are exchanged in chemical reactions

In nuclear reactions, mass is converted to energy. This is due to the process of nuclear fission or fusion, where the nucleus of an atom is split or combined, resulting in a release of energy. This conversion of mass into energy is governed by Einstein's famous equation, E = mc², where E represents energy, m represents mass, and c represents the speed of light. In chemical reactions, on the other hand, energy is released or absorbed through the rearrangement of atoms and the breaking or formation of chemical bonds, which typically involves much smaller amounts of energy compared to nuclear reactions.