Topic 3 Lesson 1

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physical change

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a change that alters the form or appearance of a material but does not make the material into another substance

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chemical change

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a change in which one or more substances combine or break apart to form new substances

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reactant

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a substance that enters into a chemical reaction

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product

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a substance formed as a result of a chemical reaction

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exothermic reaction

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a reaction that releases energy, usually in the form of heat

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endothermic reaction

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a reaction that absorbs energy

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rate

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how slowly or quickly something happens