Brittany Lease 2/8/11
Period 9 Chemical Reactions
Chemical reactions happen in almost everything around us. Reactions are very important in everyday life, and science. Chemical reactions are the changing of substances to other substances by the breaking of bonds in reactants and the formation of new bonds in products. There are different types of chemical reactions such as combination reaction, decomposition reaction, single-replacement reaction, double-replacement reaction, and combustion reaction. Combination reaction is a chemical change in which two or more substances to form a new single substance. The reactants of most common combination reactions are either two elements or two compounds. The product a combination reaction is always a compound. Combustion reactions always involve molecular oxygen. Anytime something burns it is a combustion reaction. Combustion reactions are almost always exothermic. When wood burns it must do so in the presence of oxygen and a lot of heat is produced. Decomposition reaction is a chemical change when one substance is broken down into two or more products. These products can be any combination of elements and compounds. It’s usually difficult to predict the products of decomposition reactions. The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction. Double-replacement reaction is a chemical change involving the exchange of ions between two compounds. These reactions usually take place between two ionic compounds in water solutions and are shown by production of precipitate. An example of a double displacement reaction occurs between sodium chloride and silver nitrate to form sodium nitrate and silver chloride. Chemical reactions are used in everyday life. The reaction of two or more elements together, results in...
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