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The band model of solids is an extended of the molecular orbital (MO) method. The overlap of atomic orbitals in an extended solid produces rise to continuous bands of electronic energy levels associated with different degrees of bonding. In a simple monatomic solid the bottom of the band is build up of orbitals bonding between all neighboring atoms; orbitals at the top of the band are antibonding, and levels in the middle have an intermediate bonding character. Different atomic orbitals may, in principle, give rise to different bands, although they may overlap in energy.
Fig. 1. Band picture for (a) nonmetallic and (b) metallic solid; occupied electronic levels are shown shaded.
Increases in temperature approximately in accordance with the Arrhenius equation used in chemical kinetics.
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Liquid propellants - Monopropellants and Bipropellants These contain an oxidizer like liquid oxygen, nitrogen tetroxide (N 2 O 2 ) or nitric acid and a fuel for example alcohol
The ratio between kinetic energy and the total energy of the electrons of hydrogen atom according to Bohr's model is: (1) 2 : 1 (2)1 : 1 (3)1 : - 1 (4)
The quantum number which may be designated by s, p, d, and f instead of number is: (1) n (2) l (3) m 1
Acetic acid (HAc) is generated by the addition of 10% excess sulfuric acid to calcium acetate (Ca(Ac) 2 ) (stream 1 compared to stream 3). The flow diagram is shown below.
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Q. Explain about Pyrometallurgy? Tri pyrometallurgy, the concentrated ore is heated up to a high temperature and reduction is done with a appropriate reducing agent. The differ
Verify the transfer function C(s)/R(s) for the block diagram given below.
Acetanilide in water Water can accept a hydrogen bond from the hydrogen of the N-H bond, and can donate a hydrogen bond to the oxygen of the CAO bond as well as to the nitrogen
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