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11:58:17 am by Sunitha, Categories: Refining , Tags: electrolytic, impurities, metals, refining, zone Refining of metals
Metals extracted by removing metallic and non-metallic impurities is known as refining of metals. Refining can be carried out in several methods.
The various steps involved in the extraction of pure metals from their ores are broadly classified into 4 groups.
1) Concentration of ores
2) Conversion of ores into oxides or other desired compounds.
3) Reduction of ores to form crude metals.
4) Refining of metals. Pages: 1 · 2
The periodic table of the chemical elements (also Mendeleev's table, periodic table of the elements or just periodic table) is a tabular display of the Chemical elements.
Aldehydes & Ketones are a class of organic compounds in which we have C=ogroup which is called the carboxylic group.Hence both these compounds are called carbonyl group .Hence both these compounds are called carbonyl compounds .In case of aldehydes the carbon group is at terminal position.Where as in Ketones the carbonyl group is present in between the carbon chain.
Phenols are class of organic compounds in which hydroxil group is directly bonded to the Benzene ring.
The Term isomerism is defined as two or more molecules have the same molecular formula but differ in physical and /or chemical properties.
History of chemical eqm started from At beginning of 18th century whole idea of chemical eqm. is based on there basic ideas: in complete reaction, reversibility & dynamic. Berthollet, Clande Laus (1748-1822) was pioneer in this field. He tonght chemistry to Napolean & ment to Egypt in 1798. He observed these that high conc. of sod. Carbonate by Lake Neutron on edge of the desert. He conclanded that
Hydrogen bond is formed when a slightly positive hydrogen atom, attached covalently to strong electronegative atom A (e.g., F, O or N) is held by a non-bonded electron pair of another atom B. The coordination number of hydrogen becomes two and it acts as a bridging atom between A and B.
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