What does a synthesis reaction typically create?

A synthesis reaction typically creates a compound. In chemistry, a synthesis reaction occurs when two or more simple substances combine to form a more complex substance. This process usually involves the formation of chemical bonds, resulting in a new compound with properties distinct from those of the individual reactants.

For example, when hydrogen gas combines with oxygen gas under the right conditions, they synthesize to form water (H₂O), which is a compound. Compounds are characterized by their specific ratios of different elements and consistent properties, unlike mixtures that can vary in composition. This clarity about the nature of synthesis reactions identifies the creation of a chemical compound as the key outcome of the process.