Exam 3 Key

Exam 3 Key - Chemistry 105 B Exam 3 04/02/09 Dr. Jessica...

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1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 3 Name: __________________________________ 04/02/09 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Question Points Score Grader 1 18 2 8 3 10 4 20 5 10 6 10 7 14 8 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 8 problems on 11 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) Determine whether the following statements are true or false. If false, correct the bold part of the statement to make the statement correct. a. The third law of thermodynamics states that the entropy of a perfect crystal at 0 K is zero. True False b. When a process is spontaneous it has a rate constant greater than 1 for the direction written. True False c. All standard reduction potentials are measured relative to the standard water electrode. True False d. In the redox reaction: 2MnO 4 - (aq) + 6H + (aq) + 5ClO 3 - (aq) Æ 2Mn 2+ (aq) + 3H 2 O (l) + 5ClO 4 - (aq) , five electrons are transferred. True
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Exam 3 Key - Chemistry 105 B Exam 3 04/02/09 Dr. Jessica...

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