Silicon tetrachloride, Silicates, Zeolites, Silicones

Silicates :
Silicon and oxygen compounds are called silicates they have SiO_4^{-4} units.

Types :

  • Ortho silicates
  • pyro silicates
  • cyclic silicates
  • chain silicates
  • sheet
  • frame work silicates

Ortho silicates :
SiO_4^{-4} units
ex : ZrSiO4 (Zircone)

Pyro silicates :
One oxygen of SiO_4^{-4} unit is shared with another unit.
It contains Si_{2}O_7^{-6} units.

Cyclic silicates :
It has 2 shared oxygen atoms.
It contains \left(SiO_3\right)_n^{-2n}
ex : Beryl – Be3Al2(SiO3)6

Chain silicates :
Single chain (Pyroxene)
It contains\left(SiO_3\right)_n^{-2n}two oxygens of \left(SiO_4\right)^{-2} units are shared with another units contain \left(SiO_3\right)_{n}^{-2n} units.

Sheet silicates :
3 oxygens of SiO_4^{-4} units are shared with other units.
Contains \left(Si_{2}O_5\right)_{n}^{-2n}units.
ex : Kaolin → Al2(OH)4Si2O5
Frame work silicates :
4 oxygens of SiO_4^{-4} units are shared with other units.
It contains SiO2 units
ex : Quartz - SiO2
       Zeolite - ZnO
Zeolites :
They are 3d - silicates.
they have honeycomb like structure (or) cage like structure.
They trap the molecules like H2O, CO2, NH3 -------

View the Topic in this Video from 0:07 to 8:11

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