Answer:
There are four types of chemical reactions: synthesis or combination reactions, decomposition reactions, single displacement or replacement reactions, and double displacement or metathesis reactions. Synthesis reactions combine two or more reactants to form a single product, decomposition reactions break down a single reactant into two or more products, single displacement reactions involve an element reacting with a compound to produce a new element and compound, and double displacement reactions involve two compounds exchanging ions to form two new compounds.