نوفمبر 6th, 2018

 

Berkelium

Berkelium Element number 97, symbol Bk, the eighth member of the actinide series of elements. In this series the Sf electron shell is being filled, just as the 4f shell is being filled in the lanthanide (rare-earth) elements. These two series of elements are very similar in their chemical properties, and berkelium, aside from small differences in ionic radius, is especially similar to its homolog terbium. Berkelium does…

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Benzoyl peroxide

Benzoyl peroxide A chemical compound, sometimes called dibenzoyl perox­ide, with the formula below. It is a colorless, crystalline solid, melting point 106-108°C (223-226°F), that is virtually insoluble in water but very soluble in most organic sol­vents. Benzoyl peroxide is an initiator, a type of material that decomposes at a controlled rate at moderate temperatures to give free radicals.

Benzoyl peroxide has a half-life (…

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Benzoic acid

Benzoic acid An organic acid, also known as benzene carboxylic acid, with the formula below. Melting point is 250.2°F (121.2°C), and the acid sublimes at 212°F (100°C). Benzoic acid is only slightly soluble in water but is soluble in most organic solvents, and reacts with bases to form the corresponding benzoate salts. Benzoic acid was first obtained by sublimation from gum benzoin. It occurs both free and combined…

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Benzene

Benzene A colorless, liquid, inflammable, aromatic hydrocarbon of chemical for­mula C6H6 which boils at 80.l°C (176.2°F) and freezes at 5.4-5.5°C (41.7-41.9°F). In the older American and British technical literature benzene is designated by the Ger­man name benzol. In current usage the term benzol is commonly reserved for the less pure grades of benzene.

Benzene is used as a solvent and…

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