Òxid de magnesi: diferència entre les revisions

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{{Chembox/Top|Òxid de magnesi}}
| Verifiedfields = changed
 
| Watchedfields = changed
{{Chembox/Image2|[[Fitxer:Magnesium-sulfide-unit-cell-3D-balls.png|200px|Òxid de magnesi]]|[[Fitxer:Magnesium-sulfide-3D-ionic.png|200px|Òxid de magnesi]]}}
| verifiedrevid = 414322178
 
| ImageFile = Magnesium oxide.jpg
{{Chembox/SectGeneral}}
| ImageFile2 = NaCl polyhedra.png
{{Chembox/OtherNames|}}
| IUPACName = Òxid de magnesi
{{Chembox/Formula|[[Magnesi|Mg]][[Oxigen|O]]}}
| OtherNames = Magnèsia <br/> [[Periclassa]]
{{Chembox/MolarMass|40,304}}
|Section1={{Chembox Identifiers
{{Chembox/Appearance|Cristalls blancs}}
{{Chembox/CASNo| CASNo = 1309-48-4}}
| CASNo_Ref = {{cascite|correct|CAS}}
 
| EINECS = 215-171-9
{{Chembox/SectProperties}}
| PubChem = 14792
{{Chembox/Density|3,6 g/cm³|sòlid}}
| ChEMBL_Ref = {{ebicite|changed|EBI}}
{{Chembox/Solubility|aigua a 20&nbsp;°C|0,08 g/l}}
| ChEMBL = 1200572
{{Chembox/MeltingPt|2 826&nbsp;°C }}
| InChI =
{{Chembox/BoilingPt|3 600&nbsp;°C}}
{{Chembox/RTECS| RTECS = OM3850000}}
 
| ATCCode_prefix = A02
{{Chembox/SectStructure}}
| ATCCode_suffix = AA02
{{Chembox/CoordGeom| IC(Mg<sup>2+</sup>): 6<br/> IC(O<sup>2–</sup>): 6}}
| ATC_Supplemental = {{ATC|A06|AD02}}, {{ATC|A12|CC10}}
{{Chembox/CrystalStructure|Cúbica}}
}}
 
|Section2={{Chembox/SectHazards}} Properties
| Formula = MgO
{{Chembox/Hazards|}}
| MolarMass = 40,3044 g/mol
{{Chembox/NFPA|1|0|0}}
| Appearance = Pols blanca
{{Chembox/RPhrases|}}
| Odor = Sense olor
{{Chembox/SPhrases|}}
| Density = 3,58 g/cm<sup>3</sup>
{{Chembox/RTECS|OM3850000}}
| MeltingPtC = 2852
{{Chembox/FlashPt|No inflamable}}
| BoilingPtC = 3600
 
| Solubility = 0,00062 g/100 mL (0 °C) <br> 0,0086 g/100 mL (30 °C)
{{Chembox/Bottom}}
| SolubleOther = Soluble en [[àcid]], [[amoníac]] <br> insoluble en [[alcohol]]
 
| ThermalConductivity = 45–60&nbsp;W·m<sup>−1</sup>·K<sup>−1</sup><ref>[http://www.konoshima.co.jp/en/resdev/004.html Application of magnesium compounds to insulating heat-conductive fillers]. konoshima.co.jp</ref>
| RefractIndex = 1,7355
| BandGap = 7.8 eV<ref>{{cite journal |journal=Solid State Communications |volume=55 |year=1985 |pages=351–5 |title=Self-consistent electronic structures of MgO and SrO |first1=O.E. |last1=Taurian |doi=10.1016/0038-1098(85)90622-2|last2=Springborg |first2=M. |last3=Christensen |first3=N.E. |issue=4 |url=http://users-phys.au.dk/nec/Papers/necSSC/SSC55351.pdf|bibcode = 1985SSCom..55..351T }}</ref>
| Dipole = 6,2 ± 0,6 D
}}
|Section3={{Chembox Structure
| CrystalStruct = [[Halita]] (Cúbic), [[Símbol de Pearson|cF8]]
| SpaceGroup = Fm<u style="text-decoration:overline">3</u>m, No. 225
| Coordination = Octaèdrica (Mg<sup>2+</sup>); octaèdrica (O<sup>2−</sup>)
| LattConst_a = 4,212Å
}}
|Section4={{Chembox Thermochemistry
| DeltaHf = −601,8&nbsp;kJ·mol<sup>−1</sup><ref name=b1>{{cite book |last=Zumdahl |first=Steven S. |title=Chemical Principles |edition=6th |publisher=Houghton Mifflin Company |year=2009 |isbn=0-618-94690-X |page=A22}}</ref>
| DeltaGf = -596,6 kJ/mol
| Entropy = 26,9&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name=b1/>
| HeatCapacity = 37,8 J/mol K
}}
|Section5={{Chembox/ Hazards|}}
| ExternalMSDS = [http://www.inchem.org/documents/icsc/icsc/eics0504.htm ICSC 0504]
| EUIndex = No està en la llista
| EUClass =
| RPhrases = {{R36}}, {{R37}}, {{R38}}
| SPhrases =
| MainHazards = [[Febre del fum del metall]], Irritant
| NFPA-H = 1
| NFPA-F = 0
| NFPA-R = 0
| NFPA-O =
| FlashPt = Ininflamable
| LD50 =
| PEL = TWA 15 mg/m<sup>3</sup> (fume)<ref name=PGCH/>
| REL = No designat<ref name=PGCH/>
| IDLH = 750 mg/m<sup>3</sup> (fume)<ref name=PGCH>{{PGCH|0374}}</ref>
}}
|Section6={{Chembox Related
| OtherAnions = [[Sulfur de magnesi]]
| OtherCations = [[Òxid de beril·li]]<br/>[[Òxid Calci]]<br/>[[Òxid d'estronci]]<br/>[[Òxid de bari]]
| OtherFunctn =
| Function =
| OtherCpds = [[Hidròxid de magnesi]]<br/>[[Nitrur de magnesi]]
}}
}}
L{{'}}'''òxid de magnesi''', MgO, també anomenat '''magnèsia''', és un compost inorgànic iònic format per [[catió|cations]] [[magnesi]], Mg<sup>2+</sup>, i [[anió|anions]] [[òxid]], O<sup>2–</sup>. Es presenta en forma de cristalls blancs. La seva [[estructura cristal·lina]] és cúbica, tipus [[clorur de sodi]]. És un composts [[higroscòpic]] que, en absorbir [[aigua]], es transforma suaument en el seu [[hidròxid]]. També absorbeix [[diòxid de carboni]], CO<sub>2</sub>, transformant-se en [[carbonat de magnesi]], MgCO<sub>3</sub>. A la naturalesa es troba en el [[mineral]] [[periclassa]].
 
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