Law of conservation of mass

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What is the Law of Conservation of Mass?

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The Law of Conservation of Mass states that in a closed system, the mass of the reactants must equal the mass of the products in a chemical reaction.

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What evidence supports the Law of Conservation of Mass in a chemical reaction?

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The total mass of the reactants before the reaction is equal to the total mass of the products after the reaction.

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What is a chemical reaction?

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A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

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What is a molecule?

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A molecule is a group of atoms bonded together.

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What is the difference between a chemical change and a physical change?

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A chemical change results in the formation of new substances, while a physical change does not alter the chemical composition of a substance.

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What is a reactant?

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A reactant is a substance that undergoes a chemical change in a reaction.

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What is a product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction.

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How can you tell if a chemical reaction has occurred?

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Signs of a chemical reaction include color change, temperature change, gas production, and the formation of a precipitate.

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What does it mean for a chemical equation to be balanced?

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A balanced chemical equation has the same number of each type of atom on both sides of the equation.

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What is the role of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of a substance involved in a reaction.