Tuesday, June 1, 2010

Oxoacids PPT

An oxoacid is an acid that contains oxygen. To be more specific, it is an acid that:

1.contains oxygen
2.contains at least one other element
3.has at least one hydrogen atom bound to oxygen
4.forms an ion by the loss of one or more protons

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Oxides PPT

An oxide is a chemical compound containing at least one oxygen atom as well as at least one other element. Most of the Earth's crust consists of oxides. Oxides result when elements are oxidized by oxygen in air. Combustion of hydrocarbons affords the two principal oxides of carbon, carbon monoxide and carbon dioxide. Even materials that are considered to be pure elements often contain a coating of oxides. For example, aluminium foil has a thin skin of Al2O3 that protects the foil from further corrosion.

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Hydride PPT

Hydride is the name given to the negative ion of hydrogen, H−. Practically, the term hydride has two distinct but overlapping meanings. To most chemists, the term hydride refers to (1) a hydrogen center that formally reacts as a hydrogen anion and (2) hydrogen ligands in metal complexes.[1] A more antiquated meaning of hydride refers to any compounds hydrogen forms with another elements, ranging over most of the periodic table, groups 1–16.

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Phosphazenes PPT

Phosphazenes are a class of chemical compounds in which a phosphorus atom is covalently linked to a nitrogen atom by a double bond and to three other atoms or radicals by single bonds. While other substitutions produce relatively persistent compounds, in organic synthesis the term largely refers to species with three amino substituents bound to phosphorus. The compounds are unusually stable examples of the phosphorane class of molecules and have a remarkable proton affinity. As such, they are one of the eminent examples of neutral, organic superbase.[1] Two examples are hexachlorocyclotriphosphazene and bis(triphenylphosphine)iminium chloride. Phosphazenes are also known as iminophosphoranes and phosphine imides.

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Borazines PPT

Borazine is an inorganic compound with the chemical formula (BH)3(NH)3. In this cyclic compound, the three BH units and three NH units alternate. The compound is isoelectronic and isostructural with benzene. For this reason borazine is sometimes referred to as "inorganic benzene".

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Silicates PPT

A silicate is a compound containing a silicon bearing anion. The great majority of silicates are oxides, but hexafluorosilicate ([SiF6]2−) and other anions are also included. This article focuses mainly on the Si-O anions. Silicates comprise the majority of the earth's crust, as well as most planets and moons. Sand, Portland cement, and thousands of minerals are silicates.

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Silicones PPT

Silicones are inert, synthetic compounds with a wide variety of forms and uses. Typically heat-resistant and rubber-like, they are commonly used in cookware, medical applications, sealants, adhesives, lubricants, insulation, and breast implants.

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