105b_Spring 2008_Practice Exam 2 parr

105b_Spring 2008_Practice Exam 2 parr - Chemistry 105 B...

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Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Practice Exam 2 Name: __________________________________ 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 18 2 10 3 10 4 20 5 14 6 10 7 18 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 7 problems on 10 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. (18 pts) Circle the correct answer. i. Which of the following is the strongest acid? a. H 2 SO 3 b. HNO 3 c. HNO 2 d. H 3 PO 4 e. HCN ii. The conjugate base of NH 3 is: a. NH 3 b. HNO 3 c. NH 4 + d. OH - e. NH 2 - iii. The pH of 1.00 x 10 -6 M HClO 4 (aq) is: a. 6.98 b. 6.00 c. 8.00 d. 7.00 e. 1.00 iv. If the pH of 0.10 M CH 3 COOH (aq) is 2.89, the percentage of acid dissociated is: a. 13% b. 5.0 % c. 10 % d. 1.3 % e. Need K a to do calculation v. Which of the following produces the weakest conjugate acid?
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This note was uploaded on 02/27/2008 for the course CHEM 105BL taught by Professor Warshel during the Fall '07 term at USC.

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105b_Spring 2008_Practice Exam 2 parr - Chemistry 105 B...

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