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.

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NGSS.MS-PS1-4

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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, involving a rearrangement of atoms.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Give an example of a physical change.

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Melting ice is an example of a physical change.

Tags

NGSS.MS-PS1-4

Front

Give an example of a chemical change.

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Rust forming on iron is an example of a chemical change.

Tags

NGSS.MS-PS1-2

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity.

Tags

NGSS.MS-PS1-4

Front

What is a chemical property?

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A chemical property is a characteristic that can only be observed during a chemical reaction, indicating how a substance interacts with other substances.

Tags

NGSS.MS-PS1-2

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What evidence indicates a chemical change has occurred?

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Evidence of a chemical change includes color change, gas production, temperature change, and the formation of a precipitate.

Tags

NGSS.MS-PS1-2

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Tags

NGSS.MS-PS1-2

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What happens to food in your stomach?

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Food is broken down by acids and enzymes in your stomach, which is an example of a chemical change.

Tags

NGSS.MS-PS1-2

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Is dissolving salt in water a physical or chemical change?

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Dissolving salt in water is a physical change because the salt can be recovered by evaporating the water.