c123_q5_sample2

c123_q5_sample2 - Dr. Woodward Chemistry 123 Sample Quiz 2...

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Unformatted text preview: Dr. Woodward Chemistry 123 Sample Quiz 2 Spring 2007 Quiz 5 20 Minutes Name _____________________________________ Lab Inst. ___________ Two-Digit Section Number ___________ ALL WORK MUST BE SHOWN TO RECEIVE FULL CREDIT 1. The crystal field splitting for the octahedral complex ion [V(H2O)6]3+ is 2.2 eV. (a) [4 points] At what wavelength would you expect to find the maximum in the absorption spectrum of this complex? (b) [4 points] Draw the crystal-field energy-level diagram and show the placement of the delectrons? (c) [2 points] What would be the color of this complex (assume only one peak in the absorption spectrum)? (d) [2 points] Would you expect the absorption maximum of [VCl6]3– to fall at a longer or at a shorter wavelength? 2. [4 points] The following pictures show two molecular orbitals in the MO diagram of H2O. For each one identify whether the orbital is bonding, antibonding or nonbonding. Which of these MO’s will be lower in energy? O MO #1 Q5-R 11:30 H MO #2 H 1 3. Show the energies and occupation of the d-orbitals for each of the following complexes: (a) [4 points] Tetrahedral [CoCl4]2– (b) [4 points] [Mo(en)2F2]+ 4. [5 points] If ethylenediammine (en) is added to an aqueous solution of [Cu(H2O)2(NH3)2]2+ the complex [Cu(H2O)2(en)]2+ will form. Write an equation for this reaction and predict the sign (positive, negative, or nearly zero) of ΔH, ΔS and ΔG for this reaction. Would you expect the equilibrium to favor [Cu(H2O)2(NH3)2]2+ or [Cu(H2O)2(en)]2+? 5. [5 points] The figure below shows the absorption spectra for SrCrO and SrMoO4. Which sample is SrCrO4 and which one is SrMoO4? 5.0 4.5 Sample B Sample A Absorbance (F(R)) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 200 250 300 350 400 450 500 550 600 650 700 750 wavelength (nm) Q5-R 11:30 2 Q5-R 11:30 3 ...
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c123_q5_sample2 - Dr. Woodward Chemistry 123 Sample Quiz 2...

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