Physical / Chemical Changes

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What is a chemical change?

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A process where substances combine or break apart to form new substances, often with different properties.

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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.

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What is burning?

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A chemical reaction between a flammable material and oxygen that produces fire and smoke.

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What is rusting?

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A chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

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What is an example of a physical change?

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Melting ice, where water changes from solid to liquid but remains H2O.

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What is an example of a chemical change?

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Baking a cake, where ingredients react to form a new substance.

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What indicates a chemical reaction has occurred?

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Signs include color change, gas formation, temperature change, or the formation of a precipitate.

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What is a reactant?

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A substance that undergoes a chemical change in a reaction.

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What is a product?

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A substance that is formed as a result of a chemical reaction.

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What is a precipitate?

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