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A suspension of flour in water, a heterogeneous mixture

In chemistry, a mixture is 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 mechanical mixtures, solutions, suspensions, and colloids. While there are no chemical changes to its constituents, the physical properties of a mixture, such as its melting point, may differ from those of the components. Some mixtures can be separated into their components by mechanical means. Azeotropes cannot, at least not directly.

Mixtures are the product of a mechanical blending or mixing of chemical substances like elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup.[1]

Mixture refers to the physical combination of two or more substances the identities of which are retained. Mixtures are either homogeneous or heterogeneous. A homogeneous mixture is a type of mixture which the composition is uniform. A heterogeneous mixture is a type of mixture the composition of which can easily be identified since there are two or more phases present. Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and many other substances dissolve in water to form homogeneous mixture. A homogeneous mixture is also called a solution.


  1. ^ Atkins' Physical Chemistry, 7th Ed. by Julio De Paula, P.W. Atkins ISBN 0198792859

International Union of Pure and Applied Chemistry. "mixture". Compendium of Chemical Terminology Internet edition.pihhhhh

Simple English

In chemistry, a mixture is a substance that is made up of two or more simpler substances. These substances can be chemical elements or compounds. A mixture can be a liquid, a solid, or a gas.

A mixture is not the same as a compound, which is made of two or more atoms connected together. For instance, a mixture of the gases hydrogen and nitrogen contains hydrogen and nitrogen, not the compound ammonia which is made of hydrogen and nitrogen atoms.

A solution can be a mixture. For instance, sugar dissolved in water is a mixture.

Solids can be mixtures also. Many kinds of soil and rock are mixtures of different minerals.


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