Which describes the law of conservation of matter? A. Chemical reactions cannot change reactants into products
B. the total number of atoms cannot change during a reaction
C. a reaction has the same type of molecules before and after
D. the reactants must have more atoms than the products

According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and kind of atoms after the chemical change as were present before the chemical change.

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