SILICON DIOXIDE - (14808-60-7)

Einführung

Name: silicon dioxide
* IUPAC
CAS-Nummer: 14808-60-7
Chemische Formel: SiO2
Molmasse: 60.0843 g
Massenprozent: Si 46.743 %; O 53.256 % 

Einstufung

Verwendung / Funktion

• "Occurs in many amorphous (glassy) and crystalline forms, quartz being the most common. Used to make glass and as an inert chromatography support material." 1

Kleben

Kleben: polar covalent
Ionic Character: 46.67 %

Thermochemie

ΔHf° (s quartz): -217.72 kcal/mol 2 = -910.94 kJ/mol
ΔHf° (s cristobalite): -217.37 kcal/mol 2 = -909.48 kJ/mol
ΔHf° (s tridymite): -217.27 kcal/mol 2 = -909.06 kJ/mol
ΔHf° (c amorphous): -215.94 kcal/mol 2 = -903.49 kJ/mol
S° (s quartz): 10.00 cal/(mol•K) 3 = 41.84 J/(mol•K)
S° (s cristobalite): 10.20 cal/(mol•K) 3 = 42.68 J/(mol•K)
S° (s tridymite): 10.4 cal/(mol•K) 3 = 43.51 J/(mol•K)
S° (c amorphous): 11.2 cal/(mol•K) 3 = 46.86 J/(mol•K)
ΔGf° (s quartz): -204.75 kcal/mol 4 = -856.67 kJ/mol
ΔGf° (s cristobalite): -204.56 kcal/mol 4 = -855.88 kJ/mol
ΔGf° (s tridymite): -204.42 kcal/mol 4 = -855.29 kJ/mol
ΔGf° (c amorphous): -203.33 kcal/mol 4 = -850.73 kJ/mol

Die Reaktionen

Für mehr Informationen

Quellen

(1) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change, 4th ed.; McGraw-Hill: New York, 2006; p 575.
(2) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(4) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(5) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 186.
(6) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 143.
(7) - Atkins, Jones, and Laverman. Chemical Principles 6th ed.; W.H. Freeman and Company: New York, NY, 2013; p F94.