Silicon dioxide

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
Std enthalpy o formation ΔfHo298	−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).
Y verify (whit is YN ?)
Infobox references

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, 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.