Write a note ona. Silicatesb. Zeolitesc. Fullerenes
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1.In chemistry, a silicate is any member of a family of anions consisting of silicon and oxygen, usually with the general formula [SiO(4−2x)−
4−x]
n, where 0 ≤ x < 2. The family includes orthosilicate SiO4−
4 (x = 0), metasilicate SiO2−
3 (x = 1), and pyrosilicateSi
2O6−
7 (x = 0.5, n = 2). The name is also used for any salt of such anions, such as sodium metasilicate; or any ester containing the corresponding chemical group, such as tetramethyl orthosilicate.[1]
Silicate anions are often large polymericmolecules with an extense variety of structures, including chains and rings (as in polymeric metasilicate [SiO2−
3]
n), double chains (as in [Si
2O2−
5]
n, and sheets (as in [Si
2O2−
5]
n
2. .Zeolites are microporous, aluminosilicateminerals commonly used as commercial adsorbents and catalysts.[1] The term zeolitewas originally coined in 1756 by Swedishmineralogist Axel Fredrik Cronstedt, who observed that rapidly heating the material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material. Based on this, he called the material zeolite, from the Greek ζέω (zéō), meaning "to boil" and λίθος (líthos), meaning "stone".[2] The classic reference for the field has been Breck's book Zeolite Molecular Sieves: Structure, Chemistry, And Use.
3.A fullerene is an allotrope of carbon in the form of a hollow sphere, ellipsoid, tube, and many other shapes. Spherical fullerenes, also referred to as Buckminsterfullerenes or buckyballs, resemble the balls used in association football. Cylindrical fullerenes are also called carbon nanotubes (buckytubes). Fullerenes are similar in structure to graphite, which is composed of stacked graphenesheets of linked hexagonal rings. Unless they are cylindrical, they must also contain pentagonal (or sometimes heptagonal) rings
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4−x]
n, where 0 ≤ x < 2. The family includes orthosilicate SiO4−
4 (x = 0), metasilicate SiO2−
3 (x = 1), and pyrosilicateSi
2O6−
7 (x = 0.5, n = 2). The name is also used for any salt of such anions, such as sodium metasilicate; or any ester containing the corresponding chemical group, such as tetramethyl orthosilicate.[1]
Silicate anions are often large polymericmolecules with an extense variety of structures, including chains and rings (as in polymeric metasilicate [SiO2−
3]
n), double chains (as in [Si
2O2−
5]
n, and sheets (as in [Si
2O2−
5]
n
2. .Zeolites are microporous, aluminosilicateminerals commonly used as commercial adsorbents and catalysts.[1] The term zeolitewas originally coined in 1756 by Swedishmineralogist Axel Fredrik Cronstedt, who observed that rapidly heating the material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material. Based on this, he called the material zeolite, from the Greek ζέω (zéō), meaning "to boil" and λίθος (líthos), meaning "stone".[2] The classic reference for the field has been Breck's book Zeolite Molecular Sieves: Structure, Chemistry, And Use.
3.A fullerene is an allotrope of carbon in the form of a hollow sphere, ellipsoid, tube, and many other shapes. Spherical fullerenes, also referred to as Buckminsterfullerenes or buckyballs, resemble the balls used in association football. Cylindrical fullerenes are also called carbon nanotubes (buckytubes). Fullerenes are similar in structure to graphite, which is composed of stacked graphenesheets of linked hexagonal rings. Unless they are cylindrical, they must also contain pentagonal (or sometimes heptagonal) rings
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