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a) do not have conductive properties.
b) are cooperative.
c) have few industrial implications.
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- (i) Explain the term combinatorial chemistry, and discuss its significance for the drug discovery. (ii) Describe the main techniques used for combinatorial chemistry.7. (a) Discuss the viscosity method for calculating the molecular mass of polymers.The enthalpy of sublimation (atomization) of Re is 704 kJ mol–1. Explain why it is significantly higher than that of Mn, which is 221 kJ mol–1.
- Can crystalline silicon become more stable in a reaction that is thermodynamically favoured but kinetically disfavoured? Explain.Mention two characteristics that the Molecular Orbital Theory considers and that are not considered in the Crystalline Field Theory.Determine the crystal structure for the following: (a) a metal with a0 = 4.9489 Å, r = 1.75 Å and one atom per lattice point; and (b) a metal with a0 = 0.42906 nm, r = 0.1858 nm and one atom per lattice point.
- (b) Line defects or dislocations are abrupt change in atomic order along a line. A dislocation is the defect responsible for the phenomenon of slip, by which most metals deform plastically. One of the types is Screw Dislocation. Sketch and explain the Screw dislocation line defects. ANSWER:give handwritten explanation and answer-Considering the patterns you have identified, estimate the likely melting points of cadmium (Cd), vanadium (V), and cobalt (Co). Enter your estimates in the figure.The HI molecule has an equilibrium bond length of 1.59 Angstroms and a dipole moment of 0.42 Debye. IF one were to treat this molecule as a pair of point charges +-q separated by the same distance as its bond length, what would the magnitude of q need to be to give the experimental dipole moment? Express your answer as q divided by the proton charge. In other words, what fraction of a full proton charge is the charge magnitude of the ion pair?
- If a Schottky defect concentration of 6.2 x 1010 /cm3 is observed in Al2O3, what is the total vacancy concentration (in 1/cm3) present in this sample of Al2O3? a. 2.3 x 108b. 3.1 x 1010c. 6.2 x 1010d. 1.24 x 1011e. 3.1 x 1011 When compared to that of a covalent material, the short-range atomic structure of amaterial assembled using ionic bonding can be characterized as having a:a) higher coordination numberb) lower atomic packing factorc) higher atomic packing factord) lower coordinationnumbere) a and c only(b) The carbon-carbon bond length of coordinated ethylene in Pt(PPh3)2(1²-C2H4), F, is 1.44 Å, as determined by X-ray crystal structure analysis. The carbon-carbon bond length of free (uncoordinated) ethylene is 1.34 Å. Rationalise this difference in bond length. Sketch relevant molecular orbitals.Write the theory, state, and explain two properties and two applications on each topic you select. Choose any three topics out of total six topics indicated below. Superconductors; Semiconductors; Materials and devices for energy generation and storage; Membranes; Biomedical materials; Miniaturization in materials science.