Physical and Chemical 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 one or more new substances with different properties. Examples include rusting, burning, and cooking.

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What is a sign that a chemical reaction has occurred?

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Signs of a chemical reaction include the formation of a gas, a change in color, the formation of a precipitate, and a change in temperature.

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Is melting butter for popcorn a chemical or physical change?

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Melting butter for popcorn is a physical change.

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What happens during a physical change?

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During a physical change, the form of a substance changes, but its chemical identity remains the same.

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What happens during a chemical change?

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During a chemical change, the substances involved undergo a transformation that results in new substances being formed.

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What is an example of a physical change?

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An example of a physical change is the melting of ice 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 the burning of wood.

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing its chemical identity, such as color, boiling point, and solubility.

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What are chemical properties?

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Chemical properties are characteristics that describe a substance's ability to undergo a chemical change, such as reactivity with acids or flammability.