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Pure
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| style="height:20px; width:200px; text-align:center;" |[[Pure]] [[Gold]] is a [[solid]] made of only [[Gold]] [[atom]]s.
| style="height:20px; width:200px; text-align:center;" |[[Pure]] [[Mercury (Element)|Mercury]] is a [[Liquid]] made of only [[Mercury (Element)|Mercury]] [[atom]]s.
| style="height:20px; width:200px; text-align:center;" |[[Pure]] [[Oxygen]] is a [[gas]] made of only [[Oxygen]] [[atom]]s.
|}
===About Purity===
: [[Pure]] does NOT mean good, healthy or natural.
: '''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.
'''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]].
===Detecting Purity===: The '''Puritypurity''' is important for ensuring that when of a sample can be determined by:*Looking at its [[property|properties]] such as the [[Melting Point|melting point]] and [[Chemical ReactionBoiling Point|reactionboiling point]]s take place there . If these are no unwanted spread over a range of [[producttemperature]]s caused by or different from the known values for the [[pure]] [[substance]] then the '''impurities'''sample is not [[pure]].: '''Impurities''' For example to test if a sample of [[Water]] is [[pure]] it can change the be [[melting|melted]] from [[Ice]] and [[propertyboiling|propertiesboiled]] from [[liquid]] of a [[substanceWater]] such as its . If the [[Melting Point|melting point]]is exactly 0°C and the [[Boiling Point|boiling point]] is exactly 100°C, then the [[Water]] is [[pure]].*Using [[Chromatography]] to observe if a [[soluble]] [[solid]] is a [[Electrical Conductivitymixture]] which [[Separating Mixtures|electrical conductivityseparate]] or s on piece of [[Strength Chromatography]] paper (Propertythere is more than one dot on the [[Chromatogram]])|strength. For example a sample of coloured ink can be placed on some [[chromatography]] paper. Using a suitable [[solvent]] the [[solute]]s within the ink will move along the [[chromatography]] paper. If there is more than one [[solute]] then ink will split into more than one dot on the [[Chromatogram]]. This means ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10211 ''Purity, page 150, GCSE Combined Science; The Revision Guide, CGP, AQA ''purity]:[https://www.amazon.co.uk/gp/product/178294639X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294639X&linkCode=as2&tag=nrjc-21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Purity, page 198, GCSE Combined Science Trilogy; Chemistry, CGP, AQA '' is essential when using ]:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Purity, page 252, GCSE Chemistry, CGP, AQA '']:[substancehttps://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d217 ''Purity, page 86, GCSE Chemistry; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Purity, pages 180-181, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']s for certain ====OCR====:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Impurities, page 26, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']:[applicationhttps://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Impurities, page 98, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Impurities; in tap water, page 100, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']s where those :[[property|propertieshttps://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Pure substances, pages 40-41, 48-49, 127, 199, Gateway GCSE Chemistry, Oxford, OCR '']] important.