# Mixture --- A mixture is a type of [[matter]] where two or more elements or molecules that have mixed together physically, but are not chemically bound. If they *are* chemically bound, then that is classified as a [[substance|pure substance]]. A **homologous mixture** is when the components have the same ratio throughout the entire mixture (i.e there is no [[concentration gradient]] within it). As far as I can tell—although there is some debate—homologous mixutres are one in the same with [[solution|solutions]]. A **heterogenous mixture** is further divided into a colloid and suspension. **Emulsions** are [[polar and nonpolar]] substances temporarily interspersed, which are sometime called mixtures but are techincally according to some inevitably pedantic chemistry reason. ___