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silver symbol agatomic weight107.868 atomic number 47discoveryknown since prehistoric time. man learned to separate silver from
aluminium atomic number13symbolalatomic weight26.98154discoverywohler 1827electronic configurationne 3pword originlatin alumen alum an astringent
copper atomic number29symbolcuatomic weight63.546discoverycu has been known since prehistoric time. it has been mined for more than 5000
high resistive materialsthe materials which have their resistivity 10-8 to 10-6 ohm-m come under this category. these materials are used for making
low resistivity materials the conducting materials having resistivity between 10-8 to 10-6 ohm-m come under this category and are used in house
classification of conducting materialselectrical resistivity of a conducting material or conductor ranges from 10-8 to 10-3 ohm-m. a good conducting
mechanical stressing when a material undergoes a mechanical treatment its resistivity changes due to mechanical distortion of the crystal structures.
alloying when an impurity atom of a different size compared to the host atom is placed into the crystal lattice the impurity atom distorts the resin
temperaturewhen the conduction electrons are only scattered by thermal vibrations of thermal ions then tau in the mobility expression refers to the
resistivityresistance may be defined as that property of a substance which opposes or restricts the flow of current or electrons through it. the
classical free electron theorythe free electron theory of metals using classical laws was developed by dude and lorentz in the beginning of last
q. compare pot furnace and tank furnace used in manufacture of glass.ans.s.no.pot furnacetank furnace1.used for special glasses optical glasses
q. describe the manufacturing process of glass.ans. manufacturing process of glass1. melting raw materials in proper properties
q. write an account of soda lime glass and safety glasses.ans. soda-lime glass or soft glass it is the ordinary glass in which na2o is added to
silica glass it is produced by heating pure sand to its melting point. because of absence of refining agents it is extremely difficult to get rid of
optical glass they contain phosphorous as replacement for most of all the silica and lead silicate containing a little cao2 the latter is capable of
borosilicate glass in this boric anhydride is used in place of lime. this glass generally contains 75-81 silica 10-13.5 b2o3 4.5-6 na2o and 2-5
laminated glass sheets of glass fibre fabric or glass wool are soaked in a solution of a thermosetting plastic and placed one above other the
glass glass is amorphous solid which is not true solid it is rather super cooled liquid which possesses a very high viscosity. it has no fixed
q. describe properties and uses of different silicate glasses and also discuss the importance of annealing in the manufacture of
radioactive decay is a process whereby unstable nuclei change into more stable nuclei by emitting particles of different kinds. alpha beta and
q. what are ion selective membranes used in electro dialysis of brackish water. give examples.ans. electro dialysis for brackish water the ion
q. name the various steps required for making water suitable for domestic use.ans. treatment process for domestic uses. no.process use for
atoms with the different numbers of neutrons and same atomic number are known as isotopes. the chemical properties of an element are determined
nuclei contain uncharged neutrons and positively charged protons these two particles with about the same mass are known as nucleons. the number