Chemical and Physical Change Vocab

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Chemical Change

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A change that happens when substances combine to form new substances with different properties.

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Combustion

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A fast chemical reaction that happens when something burns, producing heat and light.

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Dissolve

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When a solid substance mixes completely with a liquid to form a solution.

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Evaporation

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When a liquid turns into a gas, usually because of heat.

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Law of Conservation of Mass

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The idea that matter can't be created or destroyed in a chemical reaction; what you start with is what you end with.

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Phase

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The physical state of matter such as solid, liquid, or gas.

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Physical Change

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When a substance changes how it looks, feels, or acts, but doesn’t change what it's made of.

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Precipitate

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A solid that forms when two liquids mix during a chemical reaction.

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Products

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New substances made by a chemical reaction.

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Reactants

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Substances that start a chemical reaction.