Physical & Chemical Changes & Properties

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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 are chemical properties?

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Chemical properties are characteristics of a substance that become evident during a chemical reaction. They describe a substance's ability to undergo changes that transform it into different substances.

Front

What are physical properties?

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Physical properties are characteristics that can be observed or measured without changing the substance's chemical identity. Examples include color, melting point, boiling point, and density.

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What is an example of a sign of a chemical reaction?

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Formation of a gas is a sign that a chemical reaction has occurred.

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Is burning wood a chemical or physical change?

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Burning wood is a chemical change.

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Is melting butter a chemical or physical change?

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Melting butter is a physical change.

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What happens to the chemical composition of a substance during a chemical change?

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The chemical composition of a substance changes during a chemical change, resulting in the formation of new substances.

Front

What is an example of a physical change?

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Crumpling paper is an example of a physical change.

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Which of the following is NOT a physical change: crumpled paper, pencil sharpening, shrunken clothing, or sour milk?

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Sour milk is NOT a physical change; it is a chemical change.