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Silicates as the base of the Earth crust...

Silicates as the base of the Earth crust
Silica and compounds derived from it, silicates, constituteca. `90%` of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" `(LGL)` sodium metasilicate `(Na_(2)SiO_(3))` soluble in water.
The solution of LGL was used earlier as office glue. Write down the net ionic equation accounting for the ability of LGL to set in air. Hydrolysis of LGL in water allows abtaining a colloidal solution of silicic acid.

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Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Determine the charge (n) .

Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Determine the number of oxygen atoms bridging adjacent tetrahedra.

Knowledge Check

  • Mantle of the earth crust is

    A
    A layer with the compoosition of solid mineral matter
    B
    A layer with the composition of fluid mineral matter
    C
    Layer with the composition of semi-fluid mineral matter
    D
    A layer with the composition of gaseous mineral matter

  • Which is most abundant in Earth's crust ?

    A
    Ca
    B
    C
    C
    Si
    D
    O

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    Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Write down equation of a reaction between aqueous of CuSO_(4) and sodium metasilicate (LGL) . Take into account the pH values of aqueous solutions of the salts.

    Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Depict its structure joining together several tetrahedra (i) . Take into account that any adjacent terahedron shares one vertex. Charged monolayers with the composition [Si_(4)O_(10)]^(m-) are found in daolinite (clay).

    Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Write down the net ionic equations matching the prosesses enumerated. For each prosess mark Yes if if leads to changes of pH . Otherwise mark NO . (a) Protonation of ortho-silicate ions leading to the formation of Si-OH groups. (b) Formation of hydrated [SiO_(4)(H_(2)O)_(2)]^(4-) anions (c) Polycondensation of ortho-silicate ions leading to the formation of Si-O-Si bonds. The structure of species occurring in aqueous solutions of silicates in rather complex. However, it is possible to distinguish the main building block of all species-orthosilicate tetrahedron (SiO_(4)^(4-))

    Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Determine the pH of 0.1 M aqueous solution of copper sulphate at 25^(@)C assuming that its hydrolysis occurs in small degree only. Use the value of the first acidity constant of [Cu(H_(2)O)_(4)]^(2+) K_(a)=1xx10^(-7) M .

    Silicates as the base of the Earth crust Silica and compounds derived from it, silicates, constituteca. 90% of the Earth crust substances. Silica gives rise to a beautiful meterial-glass. Nobody knows exactly how glass was discovered. There is a well-favoured story related to phoenician sailors who fused occassionally sea sand and soda ash. It is likely that they discovered the secret of "liquid glass" (LGL) sodium metasilicate (Na_(2)SiO_(3)) soluble in water. Using the same strategy as in 3.3 to 3.5 depict a fragment of the layered structure joining 16 tetrahedra (i) . Note that 10 tetrahedra have shared vertices with 2 neighbours each, and the rest 6 have shared vertices with 3 neighbours each. Being placed into the LGL solution, salts of transition metals give rise to fancy "trees" tinted relevant to the colour of the salt of the the corrsponding transition metal. Crystals of CuSO_(4).5H_(2)O produce "trees" of blue colour whereas those of NiSO_(4).7H_(2)O form green "trees".

    Silicon and its Compound Silica, Silicates, Silicones

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