What is a solution in chemistry?

A solution in chemistry is defined as a homogeneous mixture of two or more substances. This means that the components of the solution are evenly distributed at the molecular level, resulting in a uniform composition throughout. For example, when table salt is dissolved in water, the salt ions are dispersed in the water molecules, creating a solution where it is not possible to distinguish between the salt and water at a macroscopic level.

The significance of the homogeneous nature of solutions lies in their consistent properties, such as concentration and color, and they behave as a single phase. This distinguishes solutions from other types of mixtures, such as heterogeneous mixtures, where the individual components remain separate and can often be physically distinguished from one another.

In contrast, the other options refer to concepts that do not match the definition of a solution. For instance, a substance with varying composition can describe mixtures or compounds that are not uniform throughout. A heterogeneous mixture refers to materials that are not uniformly distributed, leading to visibly different components. A solid compound is a pure substance that does not embody the characteristics of a solution, which is always a mixture of liquids, gases, or solids dissolving into a solvent. Thus, the choice that best captures the essence of a solution is the one that identifies it as