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Pure
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: The opposite of a [[pure]] [[substance]] would be a [[mixture]] of [[substance]]s.
: A [[substance]] can be [[pure]] because it is made of only one [[element]] or it can be [[pure]] because it is made of only one [[compound]].
: The word [[pure]] is often used in food adverts to mean there is only one ingredient, eg [[pure]] orange juice contains only oranges, but most people confuse it for meaning something that is healthy, natural or good. Be careful not to confuse this for the real meaning of [[pure]].
===Examples===
| style="height:20px; width:200px; text-align:center;" |[[Pure]] [[Carbon Dioxide]] is a [[gas]] made of only [[Carbon Dioxide]] [[molecule]]s.
|}
==Key Stage 4==
===Meaning===
A [[pure]] [[substance]] is one that contains only one type of [[chemical]].
===About Purity===
: [[Pure]] does NOT mean good, healthy or natural.
'''Purity''' may refer to:
*A '''pure''' [[element]] - A [[substance]] containing only one type of [[atom]].
*A '''pure''' [[compound]] - A [[substance]] containing only one [[chemical]] [[compound]].
: '''Purity''' is important for ensuring that when [[Chemical Reaction|reaction]]s take place there are no unwanted [[product]]s caused by the '''impurities'''.
: '''Impurities''' can change the [[property|properties]] of a [[substance]] such as its [[Melting Point|melting point]], [[Electrical Conductivity|electrical conductivity]] or [[Strength (Property)|strength]]. This means '''purity''' is essential when using [[substance]]s for certain [[application]]s where those [[property|properties]] important.