In chemistry, a mixture's when two or more different substances are mixed together but not combined chemically. The molecules of two or more different substances are mixed in the form of solutions, suspensions, and colloids. While there're no physical changes in a mixture, the physical properties of a mixture, such as its melting point, may differ from those of its components. Mixtures can usually be separated into its original components by mechanical means. Mixtures are either homogeneous or… (More on Mixture)