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[[Glass]] is a [[hardness|hard]], [[brittle]] and [[transparent]] [[solid]] (at [[Room Temperature|room temperature]]) made from Silicon Dioxide. ===About Glass===: [[Glass]] is made by [[melting]] sand and allowing it to [[Freezing|freeze]] into a new shape.: [[Glass]] is used for windows because it is [[transparent]].: [[Glass]] is brittle which means it doesn't not change shape easily and will break before bending.: [[Glass]] is a [[solid]] but is unusual because the [[particle]]s are not in a regular order. ==Key Stage 4=====Meaning===[[File:GlassGiantCovalentStructure.png|right|300px|thumb|This [[diagram]] shows the [[Giant Covalent Structure|giant covalent structure]] of [[glass]].]][[Glass]] is a [[Giant Covalent Structure]] made from Silicon Dioxide. ===About Glass===: [[Glass]]is an [[Amorphous Solid|amorphous solid]] which has [[particle]]s in fixed positions, but not in a regular arrangement. ===Applications and Properties==={| class="wikitable"|-| style="height:20px; width:100px; text-align:center;" |'''Application'''| style="height:20px; width:400px; text-align:left;" |'''Properties'''|-| style="height:20px; width:100px; text-align:center;" |Windows| style="height:20px; width:400px; text-align:left;" |Transparent - So light can pass through. Hard - So it doesn't get scratched. Strong - So it does not change shape under a [[force]].|-| style="height:20px; width:100px; text-align:center;" |Lenses| style="height:20px; width:400px; text-align:left;" |Transparent - So light can pass through. Hard - So it doesn't get scratched. Strong - So it does not change shape under a [[force]]. Refractive Index of 1.3 - To [[refraction|refract]] light.|-| style="height:20px; width:100px; text-align:center;" |Light Bulbs| style="height:20px; width:400px; text-align:left;" |Transparent - So light can pass through. Hard - So it doesn't get scratched.|} ===References=======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 ''Glass, page 226, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Glass, page 264, GCSE Chemistry, Hodder, AQA '']:[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 ''Glass, page 280, GCSE Chemistry, CGP, AQA ''] ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Glass, page 202, GCSE Chemistry, Pearson, Edexcel ''] ====OCR====:[https://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 ''Glass, pages 220-222, 227, Gateway GCSE Chemistry, Oxford, 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 ''Glass, pages 85, 86, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']