When a chemical reaction occurs, what always stays the same between reactants and products? A. the amount of order and disorder

B. the number of molecules

C. the number of bonds

D. the number of atoms

E. the amount of solid matter

D. The number of atoms remains the same.

Explanation:

In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.

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