Sp_10_Parr_E3_key

Sp_10_Parr_E3_key - Chemistry 105 B Exam 3 04/01/10 Dr....

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1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 3 Name: ______________________________ 04/01/10 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. 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 12 2 10 3 10 4 10 5 8 6 8 7 8 8 6 9 10 10 8 11 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. There are 11 problems on 11 pages. Please count them before you begin. A periodic table and some useful equations can be found on the last page. 3. If necessary, please continue your solutions on the back of the preceding page (facing you). 4. You MUST submit all pages to the proctors, including the periodic table page. Put your name onto the periodic table page in the space provided . 5. You MUST use black or blue ink in order to be eligible for any regrades. (No whiteout, no erasable ink, no pencil.) 6. Only a Casio FX-260 calculator may be used on Chem 105a/b exams. 7. Turn off cell phones and other electronic communication devices and put them away, out of sight. They may not be taken out of your bag during the exam. 8. When time is called, stop working on your exam immediately, turn the exam over and pass it to the aisle. 9. Good luck!! =) First Letter of Last Name
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2 1. (12 pt) Predict the signs of Δ S sys and Δ S surr for the following reactions: a. Combustion of liquid octane: 2 C 8 H 18 (l) + 25 O 2 (g) 16 CO 2 (g) + 18 H 2 O (g) Δ S sys : positive negative Δ S surr : positive negative b. Rusting of iron: 4 Fe (s) + 3 O 2 (g) 2 Fe 2 O 3 (s) H o = -1652 kJ Δ S sys : positive negative Δ S surr : positive negative c. Dissolving ammonium chloride in water, the temperature of the solution
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Sp_10_Parr_E3_key - Chemistry 105 B Exam 3 04/01/10 Dr....

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