Exam 2 key

Exam 2 key - 1 Chemistry 105 B PLEASE PRINT YOUR NAME IN...

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Unformatted text preview: 1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 2 Name: __________________________________ 7/21/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TAs Name: _________________________________ Question Points Score Grader 1 20 2 8 3 18 4 10 5 16 6 8 7 10 8 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 9 problems on 9 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 2 1. (20 pt) Answer the following multiple choice questions. i. At 0 o C K w is 1.2 x 10-15 . The pH of pure water at 0 o C is: a. 7.00 b. 6.88 c. 7.56 d. 7.46 ii. Which of the following is not true for a solution at 25 o C that has a hydroxide concentration of 2.5 x 10-6 M? a. K w = 1 x 10-14 b. The solution is acidic b. The solution is basic c. The [H + ] is 4 x 10-9 M e. The K w is independent of what the solution contains. iii. Which of the following species, when dissolved in H 2 O, will not produce a basic solution? a. SO 2 b. NH 3 c. BaO d. Ba(OH) 2 e. none of these iv. If the K a for HCN is 6.2 x 10-10 , what is K b for CN- ? a. 6.2 x 10-24 b. 6.2 x 10 4 c. 1.6 x 10-5 d. 1.6 x 10 23 v. Which of the following aqueous solutions will have the highest pH? For NH 3 , K b = 1.8 x 10-5 ; for C 2 H 3 O 2- , K b = 5.6 x 10-10 . a. 2.0 M NaOH b. 2.0 M NH 3 c. 2.0 M HC 2 H 3 O 2 d. 2.0 M HCl e. all the same vi. Calculate the pH of a 0.10 M solution of Ca(OH) 2 . a. 13.3 b. 13.0 M c. 0.2 d. 0.1 3 vii. For the stepwise dissociation of aqueous H 3 PO 4 , which of the following is not a conjugate acid-base pair?...
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Exam 2 key - 1 Chemistry 105 B PLEASE PRINT YOUR NAME IN...

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