A combination of substances that are not chemically combined is called an?

A combination of substances that are not chemically combined is called a mixture. Mixtures can be heterogeneous, where the individual components can be seen and separated, or homogeneous, where the components are uniformly distributed and not easily distinguishable. Examples include air (a homogeneous mixture) and salad (a heterogeneous mixture). Unlike compounds, the individual substances in a mixture retain their own properties.