8.5E - 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 are reactants in a chemical equation?

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Reactants are the starting substances that undergo a chemical change in a reaction.

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If 12g of Carbon reacts with 16g of Oxygen, how much carbon monoxide (CO) is formed?

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28g of carbon monoxide (CO) is formed.

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In a chemical reaction, if 2g of Hydrogen and 4g of Oxygen react, how much water is produced?

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6g of water is produced.

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In the reaction AB -> A + B, if reactant AB has 12g and product B has 5g, how many grams should product A have?

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Product A should have 7g.

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In a reaction A + B -> C, if reactant A has 5g and product C has 9g, how many grams should reactant B have?

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Reactant B should have 4g.

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What is a chemical equation?

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A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their quantities.

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What is the difference between a reactant and a product?

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A reactant is a substance that starts a chemical reaction, while a product is a substance that is formed as a result of the reaction.

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How do you calculate the mass of a product in a chemical reaction?

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To calculate the mass of a product, use the Law of Conservation of Mass: total mass of reactants = total mass of products.

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What is the significance of balancing a chemical equation?

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Balancing a chemical equation ensures that the Law of Conservation of Mass is upheld, meaning the number of atoms for each element is the same on both sides of the equation.

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