Viquipèdia

Diòxid de silici: diferència entre les revisions

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{{ICQ}}
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{{ChemboxICQ}}
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 476993639
| ImageFile1 = Sample of silicon dioxide.jpg
| ImageCaption1 = Diòxid de silici pur
| ImageFile1_Ref = {{Chemboximage|correct|??}}
| ImageNameR1 = Una mostra de diòxid de silici com sorra en una duna
| ImageCaptionR1 = Diòxid de silici com sorra
| IUPACName = Diòxid de silici
| OtherNames = Quars<br/>Sílice<br/>Òxid silícic<br/>Òxid de silici (IV)<br/>Sílice cristal·lina
|Section1={{Chembox Identifiers
| CASNo = 7631-86-9
| CASNo_Ref = {{cascite|correct|CAS}}
| PubChem = 24261
| ChemSpiderID = 22683
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| UNII = ETJ7Z6XBU4
| UNII_Ref = {{fdacite|correct|FDA}}
| EINECS = 231-545-4
| KEGG = C16459
| KEGG_Ref = {{keggcite|changed|kegg}}
| MeSHName = Silicon+dioxide
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 30563
| RTECS = VV7565000
| Gmelin = 200274
| SMILES = O=[Si]=O
| StdInChI = 1S/O2Si/c1-3-2
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = VYPSYNLAJGMNEJ-UHFFFAOYSA-N
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
}}
|Section2={{Chembox Properties
| Formula =SiO<sub>2</sub>
| MolarMass = 60,08 g/mol
| Appearance = Cristalls transparents
| Density = 2,648 (α-quars), 2,196 (amorfa) g·cm<sup>−3</sup><ref name=b92/>
| MeltingPt = 1,713&nbsp;°C (3,115 °F; 1,986 K) (amorfa)<ref name=b92>{{RubberBible92nd|page=4.88}}</ref>
| BoilingPt = 2,950&nbsp;°C (5,340 °F; 3,220 K)<ref name=b92/>
| Solubility =
| RefractIndex = 1,544 ([[Birefringència|o]]), 1,553 (e)<ref name=b92>{{RubberBible92nd|page=4.143}}</ref>
| ThermalConductivity = 12 (<nowiki>||</nowiki> c-eix), 6,8 (⊥ c-eix), 1,4 (am.) W/(m⋅K)<ref name=b92>{{RubberBible92nd|page=12.213}}</ref>
}}
|Section3 = {{Chembox Structure
| CrystalStruct = [[Tetràedre|tetraèdrica]]
}}
|Section4={{Chembox Hazards
| MainHazards =
| NFPA-H = 0
| NFPA-F = 0
| NFPA-R = 0
| RPhrases ={{R42}} {{R43}} {{R49}}
| SPhrases ={{S22}} {{S36}} {{S37}} {{S45}} {{S53}}
| IDLH = 3000 mg/m<sup>3</sup> (amorfa)<ref name=PGCH0552>{{PGCH|0552}}</ref><br/>Ca [25 mg/m<sup>3</sup> (cristobalita, tridimita); 50 mg/m<sup>3</sup> (quars)]<ref name=PGCH0682>{{PGCH|0682}}</ref>
| REL = TWA 6 mg/m<sup>3</sup> (amorfa)<ref name=PGCH0552/><br/>Ca TWA 0,05 mg/m<sup>3</sup><ref name=PGCH0682/>
| PEL = TWA 20 mppcf (80 mg/m<sup>3</sup>/%SiO<sub>2</sub>) (amorfe)<ref name=PGCH0552/>
}}
|Section5={{Chembox Related
| OtherFunction_label = diones
| OtherFunction = [[Diòxid de carboni]]<br/>[[Diòxid de germani]]<br/>[[Diòxid de plom]]<br/>[[Diòxid d'estany]]
| OtherCompounds = [[Monòxid de silici]]<br/>[[Sulfur de silici]]
}}
|Section6={{Chembox Thermochemistry
| DeltaHf = −911&nbsp;kJ·mol<sup>−1</sup><ref name=b1>{{ref-llibre|autor= Zumdahl, Steven S.|títol=Chemical Principles 6th Ed.|editorial= Houghton Mifflin Company|any= 2009| isbn = 0-618-94690-X|pàgina=A22}}</ref>
| Entropy = 42&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name=b1/>
}}
}}
El [[compost químic]] conegut com a '''diòxid de silici''' o '''sílice''' és l'[[òxid]] de [[silici]], amb [[fórmula química]] '''SiO<sub>2</sub>'''.
 
Obtingut de «https://ca.wikipedia.org/wiki/Diòxid_de_silici»