Exam 4 Sum 08 105a key

Exam 4 Sum 08 105a key - Chemistry 105 A Exam 4 Dr Jessica...

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1 Chemistry 105 A PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 4 Name: __________________________________ 06/23/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Question Points Score Grader 1 10 2 20 3 8 4 10 5 15 6 12 7 10 8 7 9 8 Total 100 Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: _______________________________________________________________ Instructions: 1. You must show work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST use black or blue ink. (No pencil, no whiteout, no erasable ink.) 4. There are 9 problems on 10 pages. Please count them before you begin. A periodic table and some useful equations can be found on the last page. 5. Good luck!! =) First Letter of last Name
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2 1. (10 pt) Circle the most correct Lewis dot structure for the following molecules or ions. i. O 2 molecule: ii. HCN molecule: iii. HNO molecule: iv. HNCO molecule: v. NCNO molecule:
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3 2. (20 pt) Given the following geometries: (a) What are the expected arrangements of electron pairs of the following molecules or ions? (Fill in the blanks below with P, Q, R, etc., or none of the above.) (b) What is the name of the molecular geometry ?
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