View source for Homogeneous vs heterogeneous

[[Category:Done 2017-07-01]] 
<onlyinclude>In most technical applications '''homogeneous''' means that the properties of a system are the uniform throughout the entire system; '''heterogeneous''' (also '''inhomogeneous''') means that the properties change within the system.<ref>A Dictionary of Chemistry (7 ed) by Richard Rennie, published 2016.</ref> Any system with two [[phase change|phase]]s like [[ice]] and [[water]] are said to be heterogeneous.</onlyinclude> 

For example, homogeneous systems have the same composition, [[density]] and [[pressure]] throughout. While a homogeneous system will often has more than one component (like salt and water), the mixture will be uniform throughout the sample. For a heterogeneous system there's clumping of salt in the salt water, or parts of the water that are saltier than others. The figures 1 and 2 below show heterogeneous and homogeneous systems.

<gallery caption="Heterogeneous and Homogeneous gas particles" mode=packed heights=250px>
File:heterogeneous.PNG|Figure 1. A heterogeneous mixture of molecules in a [[gas]] because the density (and pressure) is different throughout.<ref name = imageref>Image made by a member of the energy education team by using the PhET resource found here: https://phet.colorado.edu/en/simulation/gas-properties, Accessed July 14th, 2017.</ref>
File:homogeneous.PNG|Figure 2. A homogeneous mixture of molecules in a [[gas]] because the density (and pressure) is uniform throughout.<ref name = imageref/>
</gallery>

These terms are also important for catalysis, for information on homogeneous vs. heterogeneous catalysis please see [http://www.chemguide.co.uk/physical/catalysis/introduction.html here].
==References==
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