Physical and Chemical Changes

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different 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.

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Example of a chemical change: Rusty nail.

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The formation of rust on a nail is a chemical change because it involves a reaction with oxygen and moisture, creating a new substance.

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Example of a chemical change: Burning wood.

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Burning wood is a chemical change because it transforms the wood into ash, smoke, and gases through combustion.

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Example of a chemical change: Soured milk.

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Soured milk is a chemical change caused by bacteria that convert lactose into lactic acid, changing the milk's properties.

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Example of a physical change: Melting ice.

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Melting ice is a physical change because it changes from solid to liquid without altering its chemical structure.

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What happens during a chemical change?

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During a chemical change, bonds between atoms are broken and new bonds are formed, resulting in new substances.

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What happens during a physical change?

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

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Is digestion a chemical change or a physical change?

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Digestion is a chemical change because it involves breaking down food into simpler substances.

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Is freezing water a chemical change or a physical change?

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Freezing water is a physical change because it changes from liquid to solid without changing its chemical composition.

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