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- (a) Given the ionic radii, Cst = 1.67Å, CI = 1.81Å, and the Madelung constant M(CSCI) = 1.763, determine to the best of your ability the molar Crystal energy (AEcryst) for CsCl. (b) Not given additional data, do you expect the value obtained to be larger or smaller than theoretical, and by how many percent do you anticipate to be off?(i) Explain the term combinatorial chemistry, and discuss its significance for the drug discovery. (ii) Describe the main techniques used for combinatorial chemistry.A. Determine whether the curved arrow(s) shown below generate a valid or invalid resonance structure. Draw the resonance structure that would result from each properly drawn arrow and identify the arrow pushing pattern (i.e. allylic positive charge, allylic lone pair, pi bond between atoms of a different electronegativity, lone pair adjacent to a positive charge, alternating pi bonds in a ring.
- Please don't provide handwritten solution ....A unit cell has a=5Å, b=5Å, c-8Å, a=90°, B-90° ad y=90°. What will be the Bravais lattice for this unit cell? Mention the following for each of the given crystallographic cubic planes. (a) Intercepts in the x, y and z coordinates (b) Reciprocals (c) Final index of the crystal plane 1/2Mention 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.A quantitative theory of bonding in ionic crystals was developed by Born and Meyer along the following lines: the total force of the system is taken to be: ae² F(r) = N-NA where N is number of positive - negative ion pairs, A and n are constant determined from experiment and at the Madelung constant which depends on the crystal structure of the solid. 1) Derive an expression of the total potential energy and identify the repulsion and the attraction terms. 2) Derive an expression of the equilibrium interatomic distance, re 3) Derive an expression of the bonding energy. 4) if the charge of the ions is double, by what factor both the equilibrium interatomic spacing ro and the bonding energy U(ro) change. Indicate which parameter increase or decrease. Comment on the magnitude of the change of both parameters.Which of the following are not allowed? State which rule is violated for any that are not allowed. (a) 1p3 (b) 2p8 (c) 3g11 (d) 4f2
- 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?Each H2O molecule in crystalline ice is bonded to four tetrahedrally distributed oxygen atoms by hydrogen bonds. (a) Show, by drawing the distinct arrangements of the four hydrogen atoms about a central oxygen atom, that there are six different but equivalent arrangements for each molecule. (b) By also considering the arrangements of the 0 atoms at the corners of the tetradhedron, show that for a lattice of N water molecules, there are ((6)/(4))N chemically equivalent possible arrangements. (c) Hence calculate the molar residual entropy of water.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.