The Law of Conservation of Mass

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How does a balanced chemical equation satisfy the Law of Conservation of Mass?

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During a chemical reaction, the total amount of matter stays the same.

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What happens to the total mass of the substances after a chemical reaction?

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It remains the same.

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In a chemical reaction, the number of atoms in the products will always equal which amount?

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the number of atoms in the reactants

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Mass of heat pack after chemical reaction in a closed system (initial mass: 15 g)?

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15 g

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