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Unformatted text preview: Chem 124 Dr. Neff KEY to Ch 9 & Ch 10 Workbooks Chapter 9 Lattice Energy a) Draw an energy level diagram that illustrates the Born Haber Cycle for CsBr. All the necessary enthalpy values are given below, in no particular order. Use this cycle to calculate the lattice energy for CsBr, and then compare it to the lattice energy for LiF (determined in class). b) Which of the following would you expect to have the highest magnitude of its lattice energy? Explain your choice clearly in terms of Coulombs Law. LiI MgF 2 RbBr CaS these two ions have the largest charges, so expect the greatest force of attraction Cs (g) Cs + (g) + e- + Br(g) Br(g) + e- Br- (g)+ Cs + (g) Cs Br(s) Cs (g) + Br 2 (l) Br 2 (l) Br 2 (g) + Cs (g) Br 2 (g) Br(g) + Cs (g) Cs (s) + Br 2 (l) H = H sub = 76.1 kJ H = H vap = 30.9 kJ H = BE = 96.5 kJ H = IE = 375.7 kJ H = EA = -325 kJ H = -LE = -660 kJ H = H f = -405.9 Chem 124 Dr. Neff Chapter 10 Lewis Structures, VSEPR 1. Here, draw the best Lewis Structures for these covalent species. None of these structures are cyclical. Make sure to take into account formal charge and draw resonance structures when possible. Make sure to take into account formal charge and draw resonance structures when possible....
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This note was uploaded on 11/16/2011 for the course CHEM 124 taught by Professor Hascall during the Fall '08 term at Cal Poly.
- Fall '08