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A substance that slows, or even stops, a chemical reaction.

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a catalyst that speeds up chemical reactions in living cells

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A substance that increases by lowering the activation of energy of a reaction.

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The minimum amount of energy needed to start a chemical reaction.

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A chemical reaction that releases thermal energy.

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Chemical reactions that a absorb energy.

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A chemical reaction in which a substance combines with oxygen and releases energy.

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The negative ions in two compounds switch places, forming two new compounds.

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One element replaces another element in a compound

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One compound breaks down and forms two or more substances

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A type of chemical reaction in which two or more substances combine and form one compound.

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A number placed in front of an element symbol or chemical formula in that equation.

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States that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the change

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The substances produced by the chemical reaction

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The starting substances in a chemical reaction.

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A description of a reaction using element symbols and chemical formulas

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A process in which atoms of one or more substances rearange to form one or more new substances