View source for Homogeneous (chemistry)

A [[Chemical substance|substance]] that is uniform in composition is a definition of '''homogeneous''' in '''Chemistry'''. This is in contrast to a substance that is [[heterogeneous]].<ref name=define>{{Cite encyclopedia|Last = Lew|First= Kristi| title =Homogeneous| encyclopedia =Acids and Bases, Essential Chemistry. New York: Chelsea House Publishing.| publisher = Online publisher: ''Science Online''. Facts On File, Inc. | date =2009||isbn= 9780791097830|format =}} access date: 2010-01-01</ref>
The definition of homogeneous strongly depends on the context used. In [[Chemistry]], a homogeneous [[Suspension (chemistry)|suspension]] of material means that when dividing the [[volume]] in half, the same amount of material is suspended in both halves of the substance. However, it might be possible to see the particles under a [[microscope]]. In Chemistry, another homogeneous substance is [[air]]. It is equally suspended, and the [[particle]]s and [[gas]]es and [[liquid]]s cannot be analyzed separately or pulled apart.

==Homogeneity of mixtures==
In Chemistry, some [[mixture]]s are homogeneous. In other words, mixtures have the same proportions throughout a given sample or multiple samples of different proportion to create a consistent mixture. However, two homogeneous mixtures of the same pair of substances may differ widely from each other and can be homogenized to make a constant. Mixtures can be characterized by being separable by mechanical means e.g. [[heat]], [[filtration]], [[gravitation]]al sorting, etc.<ref name=mixture/>
===Solutions===
A [[solution]] is a special type of homogeneous mixture. Solutions are homogeneous because, the ratio of solute to solvent remains the same throughout the solution even if homogenized with multiple sources, and stable because, the solute will not settle out, no matter how long the solution sits, and it cannot be removed by a filter or a [[centrifuge]].<ref name=solution>{{Cite encyclopedia
  | title =Solution (chemistry)| encyclopedia =Encyclopedia of Environmental Studies, New Edition| volume =| publisher = Online publisher:''Science Online''. Facts On File, Inc. | date =2001| format = authors: William Ashworth and Charles E. Little}} access date: 2010-01-01</ref>
This type of mixture is very stable, i.e., its particles do not settle, or separate. As homogeneous mixture, a solution has one phase (liquid) although the solute and solvent can vary: for example, salt water.
In chemistry, a mixture is a  substance containing two or more elements or compounds that are not chemically bound to each other but retain their own chemical and physical identities; - a substance which has  two or more [[constituent]] chemical substances.  Mixtures, in the broader sense, are  two or more substances physically in the same place, but these are not chemically combined, and therefore ratios are not necessarily considered.<ref name=mixture>{{Cite encyclopedia| title =Mixture| encyclopedia =Encyclopedia of Environmental Studies| publisher =Online publisher:''Science Online''. Facts On File, Inc. |  date =2001| format =authors: William Ashworth and Charles E. Little}} access date: 2010-01-01</ref>

==References==
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[[Category:Chemical mixtures]]

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