Blank Chem Prelim 2 - Name(Last(First Cornell Student ID...

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1 Name________________________________ ( Last ) ( First ) Cornell Student ID Number________________________________ Lab Instructor’s Name________________________________ Lab Section (Day and Time)________________________________ Chemistry 207 Preliminary Examination 2 November 9, 2006 Time: 7:30 PM – 9:00 PM Please do not open the exam until told to do so. You have 1.5 hours to complete the exam. This exam has 9 pages, none of them blank. Page 9 shows a periodic table, the spectrochemical series, an important reminder, and the d-orbital energy ordering for a square planar complex. Before beginning work, check to make sure your exam is complete. Write directly on these pages. Show all of your work and indicate units where necessary . You may turn in the exam at the front of the room when finished. 1. (30) ______ 2. (30) ______ 3. (30) ______ 4. (25) ______ 5. (30) ______ 6. (30) ______ TOTAL (175) _________
2 1. (30 points) Molecular Geometry (Lewis Structures) Draw the Lewis structures for the following molecules. Show all bonded and non-bonded electrons (with dots and dashes), assign formal charges to each atom, show any resonance structures (indicating which is preferred), and predict the molecular geometry and bond angles.

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