Law of Conservation of Mass

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What is the Law of Conservation of Mass?

Back

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.

Front

Why can't atoms be created or destroyed in a chemical reaction?

Back

Atoms cannot be created or destroyed because they are rearranged during a chemical reaction, but their total number remains constant.

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If a chemical reaction starts with 50g of reactants, what should be the mass of the products?

Back

The mass of the products should also be 50g, as mass is conserved.

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What happens to the mass in a chemical reaction if the products weigh less than the reactants?

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If the products weigh less, it indicates that the reaction did not follow the Law of Conservation of Mass.

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What are reactants in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change to form products.

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What are products in a chemical reaction?

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Products are the substances formed as a result of a chemical reaction.

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In a closed system, what happens to gases released during a reaction?

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In a closed system, gases released during a reaction get trapped and do not escape into the air.

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Can the mass of products be greater than the mass of reactants?

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No, according to the Law of Conservation of Mass, the mass of products cannot exceed the mass of reactants.

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

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Combustion of methane (CH4 + 2O2 -> CO2 + 2H2O) where the total mass of reactants equals the total mass of products.

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What is the significance of balancing chemical equations?

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Balancing chemical equations ensures that the number of atoms for each element is the same on both sides, reflecting the Law of Conservation of Mass.