105b practice exam 1

105b practice exam 1 - Chemistry 105 B Exam 1 02/07/08 Dr....

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Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 1 Name: __________________________________ 02/07/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 Please circle lab section above . Question Points Score Grader 1 10 2 10 3 12 4 9 5 10 6 9 7 12 8 5 9 5 10 10 11 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 11 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!! =) 1 First Letter of last Name
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1. (10 pts) Answer the following questions using the following data for the reaction: 4 HBr (g) + O 2 (g) → 2 H 2 O (g) + 2 Br 2 (g) Time (s) [HBr] (mol/L) 0 1.00 10 0.85 20 0.73 30 0.64 40 0.56 50 0.50 60 0.45 70 0.41 80 0.38 90 0.35 100 0.33 (a) What is the half-life for this reaction? ___________________________________ (b) What is the concentration of H 2 O after 30 s? _____________________________ (c) What is the concentration of Br 2 after 80 s? ______________________________ (d) If the initial concentration of O 2 is 1.0 M, what is the concentration of O 2 after 40 s? __________________________________________ (e)
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105b practice exam 1 - Chemistry 105 B Exam 1 02/07/08 Dr....

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