Chemical Reactions and Equations

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A change in which one or more substances are converted into a new substance is called a chemical reaction.

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Chemical reaction.

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If a precipitate, water, or a gas forms when two ionic compounds in solution are combined, the reaction is a double-displacement reaction.

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Double-displacement reaction.

Front

A substance that prevents certain chemical reactions is an inhibitor.

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Inhibitor.

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When two or more substances combine in a chemical reaction to form another substance, a synthesis reaction has taken place.

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Synthesis reaction.

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The breakdown of a substance into two or more simpler substances is a decomposition reaction.

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Decomposition reaction.

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In a chemical equation, the substances that react are called reactants.

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Reactants.

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A substance that speeds up a chemical reaction without itself being permanently changed is a catalyst.

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Catalyst.

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A reaction that requires energy in the form of heat is an endothermic reaction.

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Endothermic reaction.

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When one element replaces another in a compound, a single-displacement reaction has occurred.

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Single-displacement reaction.

Front

If the energy released in a chemical reaction is primarily in the form of heat, that reaction is an exothermic reaction.

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Exothermic reaction.