Silicon dioxide, forby kent as silica (frae the Laitin silex), is a chemical compoond that is a dioxide o silicon wi the chemical formula SiO2.
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It haes been kent syne auncient times. Silica is maist commonly foond in naitur as quartz, as well as in various livin organisms, Silica is ane o the maist complex an maist abundant faimilies o materials, existin baith as several minerals an bein produced synthetically. Notable ensaumples include fused quartz, crystal, fumed silica, silica gel, an aerogels. Applications range frae structural materials tae microelectronics tae components uised in the fuid industry.
Pure silicon dioxide | |
Names | |
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IUPAC name Silicon dioxide | |
Ither names Quartz Silica | |
Identifiers | |
CAS Nummer | |
3D model (JSmol) | |
ChEBI | |
ChemSpider | |
EC Nummer | 231-545-4 |
Gmelin Reference | 200274 |
KEGG | |
MeSH | Silicon+dioxide |
PubChem CID | |
RTECS nummer | VV7565000 |
UNII | |
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SMILES
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Properties | |
SiO2 | |
Molar mass | 60.08 g/mol |
Appearance | Transparent crystals |
Density | 2.648 g·cm−3 |
Bylin pynt | 2,230 °C (4,050 °F; 2,500 K) |
Relatit compoonds | |
Thermochemistry | |
Staundart molar entropy S | 42 J·mol−1·K−1 |
Std enthalpy o formation ΔfH | −911 kJ·mol−1 |
Hazards | |
Main hazards | Inhalation of dust is carcinogenic |
NFPA 704 | 0 0 0 |
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa). | |
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Infobox references | |
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