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it is important to differentiate the stoichiometric or empirical formula of a molecular substance from its molecular formula. the former expresses
the most important classification of elements is that of non-metallic versus metallic. metallic elements form solids that are good conductors of
q. write short notes on fabrication of rubber objects.sol. fabrication of rubber in the row condition rubber is composed of molecules of great length
types of polymerization sol. types of polymerization polymerization is a process in which the joining together of many small molecules to form
q. write short note on electrically conducting polymers.ans. electrically conducting polymers many synthetic organic polymers have been found to
q. explain vulcanization of rubber is necessary.ans. importance of vulcanization of
short note on synthetic rubber.sol. synthetic rubber main types of synthetic
polyethylene polyethylene are formed by polymerization of ethylene under high pressure and at moderately high temperature. the resulting polymers are
electron configurations are governed by a limitation called as the pauli exclusion principle no two electrons can have the same value for all
terylenepreparation terylene is prepared by a polyconensation reaction between a dicarboxylic acid and a idol.properties a fully aliphatic
neoprene gr or polychloroprene or dupepreparation neoprene is prepared by the free radical polymerisation of chloroprene in an emulsion system.
nitrite rubbers gr-a or buna-n or nbr nitrite rubber is prepared by the copolymerization of butadiene and acrylonitrile in emulsion
styrene rubber gr-s or buna-s or sbr or ameripol styrene butadiene rubber sbr is prepared by the copolymerization of butadiene 75 and styrene 25 in
bakelite it is thermosetting plastics which are most widely used and the most important plastics.preparation it is formed by condensation reaction of
q. differentiate the thermoplastic and thermo sets. orwrite
q. discuss the classification of polymers. orhow are polymers classified?
addition polymerization it involves following three mechanisms1. free radical
vulcanization vulcanization is very widely used in rubber technology to improve the properties such as low tensile strength plastic nature thickness
natural rubber natural rubber is obtained by making small incisions on the bark of certain types of trees like have a brasiliensis and ganynle. white
nylon polyamides synthetic fibre forming polyamides are also termed as nylons. therefore nylon is well known in the textiles. nylons are those
thermoplastic these polymer gets soften on heating and can be converted into any shape that they can retain on cooling. such polymers that soften on
nichrome nichrome is an alloy of manganese 1.5 nickel 75 to 78 chromium 20 to 23 and a little percentage of iron.properties1. its
constantan constantan is a copper-nickel alloy. the amount of nickel in constantan is 40.properties1. it is silver like
the lead alloy most of the soldering in the electronic industry is carried out using tin lead alloy. pure lead metals at 3270c whereas tin melts at
tinatomic number50symbolsnatomic weight118.69discoveryknown since ancient timeelectronic configurationkr5s24d105p2word originanglo-saxon tin latin