Final answer:
Nuclear reactions involve changes in the atom's nucleus, while chemical reactions involve a rearrangement of electrons. The types of atoms present change in nuclear reactions but do not change in chemical reactions. Energy changes in nuclear reactions are much larger than in chemical reactions.
Step-by-step explanation:
Nuclear reactions involve changes in the nucleus of an atom, while chemical reactions involve a rearrangement of electrons. In nuclear reactions, atoms can be converted into different elements, whereas the types of atoms present do not change in chemical reactions. Additionally, the energy changes in nuclear reactions are much larger than those in chemical reactions.