Chemical and Physical Changes

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like burning, rusting, and digestion.

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What is an indicator of a chemical change?

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Indicators of a chemical change include unexpected color change, gas formation, light production, and temperature change.

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What happens to atoms during a chemical reaction?

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During a chemical reaction, atoms are rearranged to form new substances, but the total number of atoms remains the same.

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What are reactants in a chemical equation?

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Reactants are the starting substances in a chemical reaction, found on the left side of the chemical equation.

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What are products in a chemical equation?

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Products are the substances formed as a result of a chemical reaction, found on the right side of the chemical equation.

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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 is neither created nor destroyed in a chemical reaction; the mass of the reactants equals the 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 ice melting into 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, which produces ash and smoke.

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What does it mean if a substance dissolves?

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If a substance dissolves, it means it has mixed with a solvent to form a solution, but this is a physical change, not a chemical change.