This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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
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 ...
View Full Document
- Spring '08