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Ex.3'11-All except 10c - Exam 3 Intermediate Chemistry...

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Exam 3 Intermediate Chemistry 030.102 Name ANSWERS Section 2 Prof. K.D. Karlin (Print) Last Name First Name April 27, 2011 Student ID # (if you know it) _ ––– _ (10 problems, 110 points) SHOW ALL WORK FOR FULL/PARTIAL CREDIT Periodic Table attached Read all problems carefully 1 . (9) According to MO theory, which of the following has the highest bond order? Largest bond energy? Shortest bond length? Show your work, by drawing small but clear MO diagrams. C 2 C 2 + C 2 Highest bond order = C 2 Largest bond energy = C 2 Shortest bond length = C 2 2 . (8) Consider the metal ion complex, [ReH 9 ] 2– . (a) What is the oxidation state of the metal atom, Re, in this complex? Answer = __ + 7 __ (b) What is the number of d -electrons in this complex? Answer = ___ 0 ___ (c) What is the coordination number in this complex? Answer = ___ 9 ___ (d) What is the name associated with the H ligand? Answer = _ hydride 3 . (5) Consider the two isomers, complexes cis -[Pt(Cl) 2 (NH 3 ) 2 ] and trans -[Pt(Cl) 2 (NH 3 ) 2 ]. (a) (4) Draw structural diagrams of both complexes, indicating which is cis and which is trans ? (b) (1) Which of the two complexes is a potent anti-cancer drug? Answer = the Cis isomer 4 . (9) What is the denticity for each of the following chelate ligands? In other words, for each of the following, how many bonds form with the ligand and a metal to which it binds?
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