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Order-disorder phenomena
a) do not have conductive properties.
b) are cooperative.
c) have few industrial implications.
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- The amount of saturation not only has an effect on the chemical but also the physical properties of the fat. For example, animal fat which is about half saturated and half unsaturated fat is a solid at room temperature but vegetable fat which is about 85 % unsaturated fat is a liquid at room temperature. This is because saturated fats are more linear compared to unsaturated which are nonlinear (bent), meaning that saturated fats are capable of more of what kind of interaction? Hydrogen bonding van der Waals Ionic bonding Covalent bondingMention two characteristics that the Molecular Orbital Theory considers and that are not considered in the Crystalline Field Theory.Provide brief definitions of fluorescence and phosphorescence, with aid of a Jablonski diagram.
- 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?What does entryopy do in catalysis by proximity effects..?3.60 (a) What are the direction indices for a vec- 231 in a 342 11 tor that passes from point 10 to point 32 tetragonal unit cell? (b) Repeat part (a) for a rhombohedral unit cell.
- The dependency between electron density and fermi energy(E,) for a 2-D free electron gas is, (а) пос Е, (b) п ос Ег 1/3 (с) пос Е (d) nc E," 1/2If 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.
- Analyze both structures of silica gel and alumina and discuss whether these stationary phases are polar or nonpolar. Justify your answer.Briefly explain the following paragraph: both the distortion of symmetry and the fact that the solid is diamagnetic indicate the existence of a Nb-Nb bond.From the data in Table 14.2, predict B for DCl D is 2H.