Silicon dioxide

(Reguidit frae Silica)

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. It haes been kent syne auncient times. Silica is maist commonly foond in naitur as quartz, as well as in various livin organisms,[2] 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 compone[2]nts uised in the fuid industry.

Silicon dioxide

Pure silicon dioxide
Names
IUPAC name
Silicon dioxide
Ither names
Quartz

Silica
Silicic oxide
Silicon(IV) oxide

Crystalline silica
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
EC Nummer 231-545-4
Gmelin Reference 200274
KEGG
MeSH Silicon+dioxide
RTECS nummer VV7565000
UNII
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
So298
42 J·mol−1·K−1[1]
Std enthalpy o
formation
ΔfHo298
−911 kJ·mol−1[1]
Hazards
Main hazards Inhalation of dust is carcinogenic
NFPA 704
NFPA 704 four-colored diamondFlammability code 0: Will nae burn. E.g., watterHealth code 0: Exposur unner fire condeetions would offer no hazard beyond that o ordinary combustible material. E.g., sodium chlorideReactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogenSpecial hazards (white): no code
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

References

eedit
  1. a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 0-618-94690-X.
  2. a b Iler, R. K. (1979). The Chemistry of Silica. Plenum Press. ISBN 0-471-02404-X.