What kind of reaction is represented by the equation A + B → AB?

The reaction depicted by the equation A + B → AB is a synthesis reaction, also known as a combination reaction. In this type of reaction, two or more reactants (elements or compounds) combine to form a single product. In the given equation, A and B are combining to form a new compound AB, demonstrating the characteristic feature of a synthesis reaction.

This process is fundamental in various chemical processes and is crucial in both organic and inorganic chemistry. It often involves the formation of chemical bonds, leading to the creation of more complex substances from simpler ones.

In contrast, a decomposition reaction involves a single compound breaking down into two or more products. A redox reaction entails the transfer of electrons between two species, resulting in changes in their oxidation states. Finally, a combustion reaction typically involves a substance combining with oxygen, releasing energy in the form of heat and light, often producing carbon dioxide and water as products. Understanding these distinctions is essential in grasping the nature of chemical reactions.