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exam4key - Chemistry 115a Professors Mak and Bau Thursday,...

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Chemistry 115a Name Professors Mak and Bau Last 4 Digits of SID# ____ - ____ - ____ - ____ Thursday, November 20, 2008 Lab Day & Time Hour Exam 4 First Letter of Family Name Question Points Score Grader 1 6 2 24 3 10 4 12 5 12 6 12 7 12 8 12 TOTAL 100 Instructions: 1. There are a total of thirteen (13) pages. Count the pages before you begin. 2. You must show your work to receive full credit (except for multiple choice questions). 3. If necessary, please continue your solutions on the back of the preceding page (facing you). 4. Do not use pencil. ACADEMIC INTEGRITY (Please sign below) : I certify that I have observed all the rules of ACADEMIC INTEGRITY while taking this exam. (signature)
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Last Name: ______________________ 2 1. (2 points each, no partial credit) For each of the following processes, determine whether it is exothermic or endothermic. (1) An ice cube melts in air. a. exothermic b. endothermic (2) A log burns inside a furnace. a. exothermic b. endothermic (3) A H 2 molecule dissociates into two H atoms. c. exothermic d. endothermic 2. (3 points each, no partial credit) Circle the most correct answer. (1) The following standing wave on a guitar string corresponds to: a. the ground state b. the 1 st excited state c. the 2 nd excited state d. the 3 rd excited state e. the 4 th excited state f. none of the above (2) Which of the following experiments demonstrates the particle nature of light: a. electron diffraction b. blackbody radiation c. the Rutherford experiment d. none of the above (3) Which of the following is a major industrial source of hydrogen gas? a. coal gasification b. hydrocarbon cracking c. the Fritz-Habor reaction d. none of the above
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Last Name: ______________________ 3 (4) The reaction 2 NI 3 (s) 2 I 2 (s) + 3 N 2 (g) is expected to: a. produce a large amount of P-V work. b. violate the 1 st law of thermodynamics. c. produce electrical work. d. have a Δ E close to zero. e. do none of the above. (5) Of the following properties: H, E, T, P, q, w a. only H and E are state functions. b. only w is not a state function. c. both q and w are not state functions. d.
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This note was uploaded on 12/12/2010 for the course CHEM 115A taught by Professor Mak,bradforth during the Fall '10 term at USC.

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exam4key - Chemistry 115a Professors Mak and Bau Thursday,...

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