There are five main types of chemical reactions: synthesis, decomposition, single displacement, double displacement, and combustion. Here are their associated equations and examples:1. Synthesis combination reaction:General equation: A + B ABIn a synthesis reaction, two or more reactants combine to form a single product.Example: N g + 3H g 2NH g In this example, nitrogen gas N reacts with hydrogen gas H to form ammonia NH .Identification: Look for two or more reactants combining to form a single product.2. Decomposition reaction:General equation: AB A + BIn a decomposition reaction, a single reactant breaks down into two or more simpler products.Example:2HO l 2H g + O g In this example, water HO decomposes into hydrogen gas H and oxygen gas O .Identification: Look for a single reactant breaking down into two or more simpler products.3. Single displacement replacement reaction:General equation: A + BC B + ACIn a single displacement reaction, one element replaces another element in a compound.Example:Zn s + 2HCl aq ZnCl aq + H g In this example, zinc Zn displaces hydrogen H in hydrochloric acid HCl to form zinc chloride ZnCl and hydrogen gas H .Identification: Look for an element replacing another element in a compound.4. Double displacement metathesis reaction:General equation: AB + CD AD + CBIn a double displacement reaction, the positive ions of two compounds exchange places, forming two new compounds.Example:AgNO aq + NaCl aq AgCl s + NaNO aq In this example, silver nitrate AgNO and sodium chloride NaCl exchange ions to form silver chloride AgCl and sodium nitrate NaNO .Identification: Look for two compounds exchanging ions to form two new compounds.5. Combustion reaction:General equation: CxHy + O CO + HOIn a combustion reaction, a hydrocarbon compound containing carbon and hydrogen reacts with oxygen to produce carbon dioxide and water.Example:CH g + 2O g CO g + 2HO g In this example, methane CH combusts in the presence of oxygen O to produce carbon dioxide CO and water HO .Identification: Look for a hydrocarbon reacting with oxygen to produce carbon dioxide and water.