What is a key difference between chemical and nuclear reactions? in chemical reactions, new compounds are formed. in nuclear reactions, compounds are destroyed. chemical reactions involve electron rearrangements. nuclear reactions involve changes to the nucleus. chemical reactions involve large changes in energy. nuclear reactions absorb or release small amounts of energy. in chemical reactions, only alpha radiation is emitted. in nuclear reactions, alpha, beta, and gamma decay may occur.

Answer;

Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.

Explanation;

-Nuclear reactions involve a change in an atom's nucleus, usually producing a different element ,along with the emission of radiations like α, β and γ etc rays. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei.

-Different isotopes of an element normally behave similarly in chemical reactions as their extra-nuclear electronic configurations are same. The nuclear chemistry of different isotopes vary greatly from each other.

-Rates of chemical reactions are influenced by external effect like temperature,pressure and catalysts. Rates of nuclear reactions are spontaneous and are unaffected by such factors.

less than one you can't create energy