105a_Practice_Exam_2 key

105a_Practice_Exam_2 key - Chemistry 105 A Exam 2 03/04/08...

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1 Chemistry 105 A PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 2 Name: __________________________________ 03/04/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Lab: W 1 / W 4 / Th 9 / Th 1 / Th 4 Please circle lab section above . Question Points Score Grader 1 8 2 8 3 14 4 8 5 5 6 5 7 10 8 10 9 8 10 14 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. 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 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. (8 pts) Predict the precipitate formed when solutions of the two ionic compounds are mixed together, if no precipitate is formed write no reaction. a. Na 2 SO 4 and Ba(NO 3 ) 2 __________________ b. Pb(NO 3 ) 2 and KI __________________ c. CuCl 2 and LiOH __________________ d. MgBr 2 and ZnSO 4 __________________ 2. (8 pts) What is the oxidation state on the chromium in each of the following ionic compounds? a. CrCl 2 __________________ b. Cr 2 (SO 4 ) 3 __________________ c. K 2 CrO 4 __________________ d. (NH 4 ) 2 Cr 2 O 7 __________________
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3 3. (14 pts) The following oxidation-reduction reaction takes place in acid:
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105a_Practice_Exam_2 key - Chemistry 105 A Exam 2 03/04/08...

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