c123_q5_sample1

c123_q5_sample1 - Dr. Woodward Chemistry 123 Sample Quiz 1...

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Unformatted text preview: Dr. Woodward Chemistry 123 Sample Quiz 1 Spring 2007 Quiz 5 20 Minutes Name _____________________________________ Lab Inst. ___________ Two-Digit Section Number ___________ ALL WORK MUST BE SHOWN TO RECEIVE FULL CREDIT 1. The absorption maximum for the complex ion [Co(NH3)6]3+ occurs at 470 nm. (a) [2 points] Predict the color of this complex. (b) [2 points] If the cobalt ion adopts a low spin configuration draw the crystal-field energy-level diagram and show the placement of the delectrons? (c) [4 points] Calculate the crystal field splitting energy, Δ, in eV. (d) [2 points] Would you expect the absorption maximum of [Co(H2O)6]3+ to fall at a longer or at a shorter wavelength (assume low spin configuration is maintained)? 2. [6 points] The following pictures show two molecular orbitals of the many that exist for a MoF6 molecule, which has octahedral geometry. For each MO, identify the atomic orbitals involved in forming the molecular orbital (Mo 5s, 5p, 4d; F 2s, 2p), and classify the molecular orbital as bonding, antibonding or non-bonding. [The Mo atom is at the center of the molecule, it is surrounded by six fluorine atoms] Error! Q5-R 11:30 1 3. Draw all stereoisomers (geometric and/or optical) for the following complexes: (a) [4 points] octahedral [Co(NH)3Cl3]+ (b) [4 points] square planar [PdBr2Cl2]2– 4. [3 points] The figure below shows the absorption spectra for a transition metal complex [M(NH3)6]2+ (where M is a transition metal ion). What would be the color of this complex? How would the absorption peak at ~610 nm shift if the NH3 ligands were replaced with H2O? 2.0 1.8 1.6 absorbance 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 200 300 400 500 600 700 800 900 wavelength (nm) Q5-R 11:30 2 ...
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This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Spring '08 term at Ohio State.

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c123_q5_sample1 - Dr. Woodward Chemistry 123 Sample Quiz 1...

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