There are actually more than three types of chemical reactions, but I will provide examples for three common types: synthesis, decomposition, and displacement reactions.1. Synthesis Combination Reaction: In a synthesis reaction, two or more reactants combine to form a single product. The general form of a synthesis reaction is A + B AB.Example: The formation of water from hydrogen and oxygen gases.2H g + O g 2HO l 2. Decomposition Reaction: In a decomposition reaction, a single compound breaks down into two or more simpler substances. The general form of a decomposition reaction is AB A + B.Example: The decomposition of potassium chlorate into potassium chloride and oxygen gas.2KClO s 2KCl s + 3O g 3. Displacement Single Replacement Reaction: In a displacement reaction, one element in a compound is replaced by another element. The general form of a displacement reaction is A + BC AC + B.Example: The reaction between zinc and hydrochloric acid, where zinc replaces hydrogen in the acid to form zinc chloride and hydrogen gas.Zn s + 2HCl aq ZnCl aq + H g There are other types of reactions as well, such as double displacement, acid-base, and redox reactions, but these three examples should give you a good starting point.