Question

which statement best explains why mass is not conserved in a nuclear change? (1 point) some of the reactants are not used. some of the atoms are lost in the reaction. some of the products have less mass than the reactants. some of the matter is converted to energy.

Explanation:

In nuclear reactions, according to Einstein's mass - energy equivalence ($E = mc^{2}$), some of the matter is converted into energy. This is why mass is not conserved in the traditional sense. The other options are incorrect as in a nuclear reaction, it's not about unused reactants, lost atoms, or products having less mass in the non - energy conversion way.

Answer:

Some of the matter is converted to energy.