Chemical and Physical Changes

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What is a physical property?

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A characteristic of a substance that can be observed or measured without changing its identity, such as color, density, or malleability.

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What is malleability?

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The ability of a substance to be deformed or shaped under pressure, often without breaking.

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What is a chemical change?

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A process that involves the transformation of one or more substances into different substances, often accompanied by energy changes.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is a physical change?

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A change that affects one or more physical properties of a substance without altering its chemical composition, such as melting or boiling.

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What happens when water is heated to steam?

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This is a physical change because the water changes state from liquid to gas without changing its chemical structure.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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What is rusting?

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Rusting is a chemical change where iron reacts with oxygen and moisture to form iron oxide, commonly known as rust.

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NGSS.MS-PS1-5

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What is digestion in the stomach?

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Digestion is a chemical change where food is broken down into simpler substances by enzymes and acids.

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NGSS.MS-LS1-7

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What is flammability?

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Flammability is a chemical property that describes how easily a substance can ignite and burn.

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What is the difference between physical and chemical properties?

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Physical properties can be observed without changing the substance, while chemical properties can only be observed during a chemical reaction.

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Can a physical change be reversed?

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Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible.