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http://misterguch.brinkster.net/6typesofchemicalrxn. html Helpful in identifying the different types of reactions Endothermic: Energy is absorbed. Energy is needed for this reaction to occur These reactions feel cold Exothermic: Energy is released by the reaction These reactions feel hot. Catalyst: A substance that speeds up the reaction. It lowers the activation energy (amount of energy needed for a reaction to take place) Inhibitor: A substance used to combine with a reactant so the reaction is prevented from occuring. There are five main types of chemical reactions Two or more substances combine to form one new substance Ex: A + B AB A + B + C ABC AB + C ABC One substance breaks down into two or more simpler substances Ex: AB A + B ABC AB + C ABC A + BC ABC A + B + C One element replaces another element in a compound (one switch) Ex: A + BC AB + C (A replaces C) A + BC AC + B (A replaces B) Elements from two different compounds replace each other (two switches) Ex: AB + CD AC + BD AB + CD AD + BC ** A double replacement with an acid and base is called a neutralization reaction a Oxygen combines with another compound to form water and carbon dioxide Commonly called “burning” Exothermic Reaction (gives off heat) Identify the following reaction types: 2KClO3 --> 2KCl + 3O2 CaBr2 + NaCO3 --> CaCO3 + 2NaBr Zn + S --> ZnS Ba + FeBr2 --> BaBr2 + Fe 2H2 + O2 --> 2H2O Identify the following reaction types: 2KClO3 --> 2KCl + 3O2 Decomposition CaBr2 + NaCO3 --> CaCO3 + 2NaBr Double Replacement Zn + S --> ZnS Synthesis Ba + FeBr2 --> BaBr2 + Fe Single Replacement 2H2 + O2 --> 2H2O Synthesis