Chemical Reactions

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Chemical reaction is the changing of substances to other substances by the breaking of bonds in reactants and the formation of new bonds in products. There are many different types of reactions. Many reactions can be assigned to more than one classification. The same reaction can be classified in different ways. It is important and useful to know all the different types of reactions because they often refer the reactions as being of one type or another. The first reaction is Acid-base (Neutralization) Reaction. A neutralization reaction occurs when an acid and base are mixed together. The compound formed by the cation of the base and the anion of the acid is called a salt. The combination of hydrochloric acid and sodium hydroxide produces common table salt. An example is
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A precipitation reaction occurs when an ionic substance comes out of solution and forms an insoluble solid. An example is lead nitrate mixed with potassium iodide, which forms a bright yellow precipitate of lead iodide: 2Pb(NO3)2 + heat → 2PbO + 4NO2 + 2O2. The fifth reaction is Combustion Reaction. It is a chemical change where an element or a compound reacts with oxygen. Combustion is similar to a decomposition reaction, except that oxygen and heat are required for it to occur. Yields energy in the form of heat and light. The main indicator that a combustion reaction has occurred is that oxygen is always going to be on the reactant side. An example of this is seen when methane gas is burned in the presence of excess oxygen: CH4 + 2O2 → CO2 + 2H2O. Another reaction is Redox. Redox is an abbreviation of reduction/oxidation reactions. It is when one species is reduced and another is oxidized. Reduction involves a gain of electrons and oxidation involves a loss, so a redox reaction is one in which electrons are transferred between species. Single-Replacement Reactions is when a chemical change where one element replaces a second element in a compound. It is identifiable

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