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A chemical reaction is the process in which one or more substances changes to yield one or more different substances. There are five different types of chemical reactions, synthesis, decomposition, single displacement, double displacement, and combustion. In a synthesis reaction, two or more substances combine to produce a new compound. A decomposition reaction is basically the opposite of a synthesis reaction, when a single compound reacts to produce two or more simpler substances. A single displacement reaction is characterized by one element replacing another similar element in a compound; the free element of the reactants displaces the more similar ion of the product’s compound and the other ion becomes the uncombined element. In a double displacement reaction, the positive ions of two compounds replace each other to form two new compounds. In a combustion reaction, a substance combines with some form of oxygen to create one or more oxides, the products in a combustion reaction will usually be carbon dioxide and  water.
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