Final answer:
A combination reaction in chemistry is a type of reaction in which two or more substances combine to form a single new substance.
Step-by-step explanation:
A combination reaction in chemistry is a type of reaction in which two or more substances combine to form a single new substance. It can also be referred to as a synthesis reaction. The general form of a combination reaction is A + B → AB. This means that the reactants, A and B, come together to form the product, AB.