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Polyethylene: Polyethylene are formed by polymerization of ethylene under high pressure and at moderately high temperature. The resulting polymers are then subjected to substitution and other reactions to yield the required plastic. Polyethylene's have good chemical resistance electrical resistance low water absorption and good flexibility. These are much cheaper than other plastics. However high temperature and sunlight affects the properties of polyethylene's adversely e.g. resistance to chemicals falls drastically at higher temperature.
USES:
(1) Used in manufacture of toys and other house hold articles.
(2) Used for the manufacturer of domestic pipes and gas pippins.
PROPERTIES:
(1) Due to strong inter: chain forces tensile strength is quite high.
(2) It can be vulcanized to a little extent to form cross linked structures with improved mechanical properties due to the little presence of double bonds. Thus this rubber cannot be hardened due to small number of cross linkages.
(3) It is highly resistant to atmosphere heat abrasion acids oils alkalis oxygen and ozone.
(1) Used as an insulation material in the electrical industry and in rubber based industries like inner tubes for the tyres of bicycles rickshaws and automobiles.
(2) Used as a solid fuel for rockets.
Which among the following species have the same number of electrons in its outermost as well as penultimate shell: (1) Mg 2+ (2) O 2-
AT 25 DEGREES CELCIUS,THE MOLAR IONIC CONDUCTIVITIES OF CALCIUM IONS,MAGNESIUM IONS AND ZINC IONS 3.87,5.01 AND 7.35 MILISECONDS SQUARE METRE PER MOLE RESPECTIVELY.CALCULATE THEIR
Unsaturated dicarboxylic acids The molecular formula of the simplest unsaturated dicarboxylic acid is HOOC.CH=CH.COOH This formula, however represents two chemical compounds, m
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He- is p block element
Q. Explain about Preparation of diborane? Diborane can be prepared in almost quantitative yields by the reduction of boron Tricloride etherate (BF 3 , 0Et 2 ) with lithium alum
Among the bonds formed by a chlorine atom with atoms of hydrogen, chlorine, sodium and carbon, the strongest bond is formed between (1) H- cl
Application of catalyst in industries
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