There are several types of chemical reactions: __ In this reaction, a new compound is formed by the combination of simpler reactions. __ In this reaction, a reactant breaks down into simpler products, which could be elements or other compounds. __ In this reaction, one reactant is always oxygen and another reactant often contains carbon and hydrogen. The carbon and hydrogen atoms combine with the oxygen, producing carbon dioxide and water. Balance the equations below and label the type of reaction it is:

## Step 1The first reaction is a synthesis reaction. In this type of reaction, two or more simple substances combine to form a more complex compound. The general form of a synthesis reaction is . In this case, the reaction is , where hydrogen and oxygen combine to form water.## Step 2The second reaction is a decomposition reaction. In this type of reaction, a single compound breaks down into two or more simpler substances. The general form of a decomposition reaction is . In this case, the reaction is , where water breaks down into hydrogen and oxygen.## Step 3The third reaction is a combustion reaction. In this type of reaction, a hydrocarbon (in this case, methane, ) reacts with oxygen ( ) to produce carbon dioxide ( ) and water ( ). The general form of a combustion reaction is . In this case, the reaction is .