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

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How does the Law of Conservation of Mass apply to chemical reactions?

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In chemical reactions, the mass of substances is neither created nor destroyed; it is simply rearranged to form new substances.

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What is a reactant?

Back

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

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What is a product?

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

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If 100 grams of reactants are used, how many grams of products will be formed?

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100 grams of products will be formed, according to the Law of Conservation of Mass.

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What happens to mass during a chemical reaction?

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The mass remains constant; it does not change.

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True or False: The mass of a closed system can change during a chemical reaction.

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False. The mass of a closed system remains constant.

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What is an example of a chemical reaction that demonstrates the Law of Conservation of Mass?

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Burning wood is an example; the mass of the wood and oxygen used equals the mass of the ash, smoke, and gases produced.

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What is the importance of measuring mass in chemical reactions?

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Measuring mass helps to ensure that the Law of Conservation of Mass is upheld and that reactions are balanced.

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How can we demonstrate the Law of Conservation of Mass in a lab?

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By conducting a reaction in a sealed container and measuring the mass before and after the reaction.