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  2. Silicon tetrachloride - Wikipedia

    en.wikipedia.org/wiki/Silicon_tetrachloride

    Si + 2 Cl 2SiCl 4. It was first prepared by Jöns Jakob Berzelius in 1823. [4] Brine can be contaminated with silica when the production of chlorine is a byproduct of a metal refining process from metal chloride ore. In rare occurrences, the silicon dioxide in silica is converted to silicon tetrachloride when the contaminated brine is ...

  3. VSEPR theory - Wikipedia

    en.wikipedia.org/wiki/VSEPR_theory

    Valence shell electron pair repulsion (VSEPR) theory (/ ˈ v ɛ s p ər, v ə ˈ s ɛ p ər / VESP-ər, [1]: 410 və-SEP-ər [2]) is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. [3]

  4. Square pyramidal molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Square_pyramidal_molecular...

    The geometry is common for certain main group compounds that have a stereochemically-active lone pair, as described by VSEPR theory. Certain compounds crystallize in both the trigonal bipyramidal and the square pyramidal structures, notably [Ni(CN) 5] 3−. [1]

  5. Silicon tetrachloride (data page) - Wikipedia

    en.wikipedia.org/wiki/Silicon_tetrachloride...

    Std Gibbs free energy of formation, Δ f G o liquid: −619.8 kJ/mol Standard molar entropy, S o liquid: 239.7 J/(mol K) Heat capacity, c p: 145. J/(mol K) Gas properties Std enthalpy change of formation, Δ f H o gas: −657. kJ/mol Std Gibbs free energy of formation, Δ f G o gas: −617.0 kJ/mol Standard molar entropy, S o gas: 330.7 J/(mol ...

  6. Square antiprismatic molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Square_antiprismatic...

    Square prismatic geometry (D 4h) is much less common compared to the square antiprism.An example of a molecular species with square prismatic geometry (a slightly flattened cube) is octafluoroprotactinate(V), [PaF 8] 3–, as found in its sodium salt, Na 3 PaF 8. [6]

  7. Germanium tetrachloride - Wikipedia

    en.wikipedia.org/wiki/Germanium_tetrachloride

    A notable derivative of GeCl 4 is germanium dioxide.In the manufacture of optical fibers, silicon tetrachloride, SiCl 4, and germanium tetrachloride, GeCl 4, are introduced with oxygen into a hollow glass preform, which is carefully heated to allow for oxidation of the reagents to their respective oxides and formation of a glass mixture.

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