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Chapter 2 Terms

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Term
Definition
Chemical Reaction   the process by which one or more substances change to produce one or more different substances  
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Precipitate   a solid that is produced as a result of chemical reaction in solution  
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Chemical Formula   a combination of chemical symbols and numbers to represent a substance  
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Chemical equation   a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products  
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Reactant   a substance or molecule that participates in a chemical reaction.  
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Product   the substance that forms in a chemical reaction  
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Law of Conservation of Mass   the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes  
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Synthesis Reaction   a reaction in which two or more substances combine to form a new compound  
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Decomposition Reaction   a reaction in which a single compound breaks down to form two or more simpler substances  
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Single-Displacement Reaction   a reaction in which one element or radical takes the place of another element or radical in a compound.  
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Double-Displacement Reaction   a reaction in which a gas, a solid precipitate, or a molecular compound forms from the exchange of ions between two compounds  
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Exothermic Reaction   a chemical reaction in which heat is released in the surroundings  
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Endothermic Reaction   a chemical reaction that requires heat  
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Law of Conservation of Energy   the law that states that energy cannot be created or destroyed but can be changed from one form to another  
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Activation Energy   the minimum amount of energy required to start a chemical reaction  
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Inhibitor   a substance that slows down or stops a chemical reaction  
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Catalyst   a substance that changes the rate of a chemical reaction without being used up or changed very much  
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