Chemistry, 23.10.2019 05:00, evelyngarcia99

If the total mass of the products of a reaction is less than the mass of the reactants, what must be true?
a nuclear reaction has taken place.
a chemical reaction has taken place.
nuclear fusion has occurred.
nuclear fission has occurred.

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If the total mass of the products of a reaction is less than the mass of the reactants, what must be...