Tag Archives | Chemical

18-ELECTRON RULE

A rule used to predict formula for stable metal complexes. Valence shells of transition metals have 9 orbitals which can accomodate 18 electrons. Metal complex with 18 electrons has electron stability of noble gas.

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3:4:4 -TRICHLOROCARBANILIDE

Anti-bacterial and anti-fungal substances, part of disinfectants, soaps and similar products.

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4-METHYL-AMINOPHENOL

It is N-methyl derivative of 4-aminophenol. Chemical formula is C7H9NO and cas number is 55-55-0.

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4-PHENETIDINE

Compound with chemical formula C8H11NO. 4-Phenetidine induces irritation of skin, eyes, lungs. It is used in the manufacture of acetophenetidin.

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ABBE REFRACTOMETER

Highly precision device used to measure index of refraction of liquids and solids.

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ABEGG'S RULE

Solubility of alkali salts of strong acids in water decrease with increase in atomic mass of elements, while the solubility of alkali salts of weak acids increase with increase of atomic mass of elements in periodic table.

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ABEGG'S RULE OF EIGHT

According to the rule, difference between the maximum positive and negative valence of an element is frequently eight. For example, sulfur in H2S has oxidation state ?2 and +6 in H2SO4. -2 + (+6) equals 8.

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ABELITE

Explosive mixture that consists of ammonium nitrate and a nitro derivative of aromatic hydrocarbon.

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ABSOLUTE ALCOHOL

Ethanol with a low water content. Maximum water contents range from 1% to ppm levels. Not intended for human consumption. It is used as a solvent in laboratories and various industries.

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ABSOLUTE CONFIGURATION

The spatial arrangement of substituents (atoms or groups) around chiral center in a molecule.

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