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Exam_4_key - Chemistry 105 A Exam 4 Dr Jessica Parr First...

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1 Chemistry 105 A PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 4 Name: __________________________________ 11/20/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 / F 1 Please circle lab section above . Question Points Score Grader 1 18 2 12 3 12 4 12 5 21 6 5 7 5 8 5 9 10 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 12 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. (18 pt) Answer the following multiple choice questions: i. Which has the longer N-O bond length, NO 2 - or NO 3 - ? a . N O 2 - b. NO 3 - c. the bond lengths are the same d. more information is needed ii. Consider the reaction: A 2 + B 2 Æ 2 AB Δ H = -285 kJ. The bond energy for A 2 is half the amount for AB. The bond energy of B 2 = 432 kJ/mol. What is the bond energy of A 2 ? a. 717 kJ/mol b. 478 kJ/mol c. 239 kJ/mol d. -143 kJ/mol e. 98 kJ/mol f. none of these iii. If four atomic orbitals on one atom overlap with four orbitals on a second atom, how many molecular orbitals will form? a. 1 b. 4 c. 8 d. 16 e. none of these
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3 iv. Consider the molecular orbital description of NO - anion (see question 5 for diagram). Which of the following statements is false? a . N O - is paramagnetic. b. NO - is isoelectronic with CO.
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This note was uploaded on 02/18/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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Exam_4_key - Chemistry 105 A Exam 4 Dr Jessica Parr First...

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