Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or boiling), shape, or texture.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves making or breaking of bonds between atoms. Examples include rusting, burning, and cooking.

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What happens to matter during a physical change?

Back

During a physical change, the matter retains its original chemical properties. No new substances are formed.

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What happens to matter during a chemical change?

Back

During a chemical change, the original substances are transformed into new substances with different properties.

Front

What is an example of a physical change?

Back

Crumpling paper is an example of a physical change because the paper's shape changes, but it remains paper.

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What is an example of a chemical change?

Back

Burning wood is an example of a chemical change because it produces ash and smoke, which are new substances.

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What is evidence of a chemical change?

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

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What is NOT evidence of a physical change?

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A change in molecular bonds is NOT evidence of a physical change; it indicates a chemical change.

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What is the difference between a physical change and a chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

What happens to butter when it melts?

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When butter melts, it undergoes a physical change from solid to liquid without forming a new substance.