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	7631-86-9 Y
3D model (JSmol)	Interactive eemage
ChEBI	CHEBI:30563 Y
ChemSpider	22683 Y
EC Nummer	231-545-4
Gmelin Reference	200274
KEGG	C16459 N
MeSH	Silicon+dioxide
PubChem CID	24261
RTECS nummer	VV7565000
UNII	ETJ7Z6XBU4 Y
InChI InChI=1S/O2Si/c1-3-2 Y Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N Y
SMILES O=[Si]=O
Properties
Chemical formula	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	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