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Polymerization reactions are chemical reactions in which simple molecules called monomers combine to form larger molecules called polymers. The equation for a polymerization reaction is typically written as: nA → (A)n where A is the monomer, n is the degree of polymerization, and (A)n is the polymer. The degree of polymerization can be any integer greater than or equal to 2. Polymerization reactions can be classified into two main types: addition polymerization and condensation polymerization. In addition polymerization, the monomers add to each other in a chain-like fashion, while in condensation polymerization, the monomers condense with each other to form a polymer and a small molecule, such as water or hydrogen chloride.