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In which two ways is a balanced chemical equation a model of the law of conservation of mass? A. The reactants do not change state when they react to form products. B. The products are the same substances as the reactants. C. The atoms are rearranged from one side of the equation to the other, but their types and numbers do not change. D. The total mass of the reactant atoms equals the total mass of product atoms.

User Emmet B
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The answer is D. The total mass of the reactant atoms equals the total mass of product atoms. A balanced chemical equation is a model of the law of conservation of mass because it shows that the total mass of the reactants is equal to the total mass of the products. This means that the atoms are neither created nor destroyed during a chemical reaction, but are simply rearranged from one side of the equation to the other.
User Mohit Deshpande
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