Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
On the basis of electrical conductivity the solids can be broadly classified into three types:
(a) Metals (b) Insulators (c) Semiconductors Electrical conductivity of metals is very high and is of the order of 104 to 107 ohm-1 while that of insulators is one of the order of 10-20 to 10-10 ohm-1 m-1. Semiconductors have intermediate conductivity which lays in the range 10-8 to 104 ohm-1 m-1. Electrical conductivity of solids may arise through the motion of electrons and positive holes (electronic conductivity) or through the motion of ions (ionic conductivity). The conduction through positive holes is called n-type conduction and through positive holes is called-type conduction. Electrical conductivity of metals is due to motion of electrons and it increases with the number of electrons available to participate in the conduction process. Pure ionic solids are those where conduction can take place only from motion of ions are insulators. Though, the presence of defects in the crystal structure raises their conductivity. Unlike metals, the conductivity of semiconductors and insulators is mainly due to the presence of interstitial electrons and positive holes in the solids due to imperfections. The conductivity of semiconductors and insulators increases with increase in temperature whereas that of metals decreases.
theory of NaOH Vs NH4Cl
CH3CH=CH-CHO
A number of ionic compounds e.g.Agcl , caF 2 BaSo 4 are insoluble in water. This is because: (1) Ionic compounds do not dissolve in water (2) Water has a high dielectri
Calculation of empirical formula The steps included in the calculation are as follows, (a) Divide the percentage (%) of each element by its atomic volume. This gives th
Salt bridge is a U-shaped tube containing a semi-solid paste of some inert electrolyte like KCl, KNO 3 , NH 4 Cl, etc. in agar-agar and gelatin. An inert electrolyte is one which
state the purification processes commonly used by organic chemists to separate different components from a mixture
An electronic transition from 1s orbital of an atom causes: (1) Absorption of energy (2) Release of energy (3) Both release or absorption of energy (4) Unpredictable
Calculate the ratio of d number of molecules in two energy levels at 27''c given E2=9.75x10"-13erg/mol E1=6.95X10"-13erg/mol g1=2 g2=3
acs exam
Nucleophilic aromatic substitution reaction The product is formed by a nucleophilic aromatic substitution reaction in which chloride is displaced by hydroxide ion. The product
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd