Silicon dioxide

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
CAS Nummer
3D model (JSmol)
ChEBI
ChemSpider
EC Nummer231-545-4
Gmelin Reference200274
KEGG
MeSHSilicon+dioxide
RTECS nummerVV7565000
UNII
Properties
SiO2
Molar mass60.08 g/mol
AppearanceTransparent crystals
Density2.648 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 hazardsInhalation 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