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 mass cannot be created or destroyed in a chemical reaction; it remains constant.

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances.

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What is evidence of a chemical change?

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Evidence of a chemical change includes color change, temperature change, gas production (bubbles), and formation of a precipitate.

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What does it mean when we say 'new substances' are formed?

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It means that during a chemical reaction, the original substances change into different substances with different properties.

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What is a reactant?

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A reactant is a substance that is present at the start of a chemical reaction and is consumed during the 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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What happens to the mass of reactants and products in a chemical reaction?

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The total mass of the reactants equals the total mass of the products.

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What is an example of a physical change?

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An example of a physical change is melting ice; it changes from solid to liquid but remains water.

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What is an example of a chemical change?

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An example of a chemical change is burning wood; it transforms into ash, smoke, and gases.

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What is bubbling in a chemical reaction an indication of?

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Bubbling indicates that a gas is being produced during a chemical reaction.