Exam 2 Key

Exam 2 Key - Chemistry 105 B Exam 2 03/05/09 Dr. Jessica...

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1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 2 Name: __________________________________ 03/05/09 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 28 2 8 3 10 4 10 5 8 6 8 7 10 8 8 9 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 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!! =) First Letter of last Name
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2 1. (28 pt) Answer the following multiple choice questions. Circle the correct answer. a. Which of the following can only be defined as an acid by the Lewis model? i. HCl ii. H 2 PO 4 - iii. AlCl 3 iv. NO 2 - b. What is the pH of a 5.0 x 10 -5 M solution of NaOH? i. 4.30 ii. 9.70 iii. 3.30 iv. 10.70 c. The [OH - ] in a potato is 6.3 x 10 -9 M. What is the [H 3 O + ]? i. 6.3 x 10 -9 M ii. 1.0 x 10 -14 M iii. 6.3 x 10 -24 M iv. 1.6 x 10 -6 M d. Which of the following statements is true about HOBr, HBrO 2 , HBrO 3 , and HBrO 4 ? i. The order of acid strengths is HOBr > HBrO 2 > HBrO 3 > HBrO 4 ii. The order of acid strengths is HBrO 4 > HBrO 3 > HBrO 2 > HOBr iii. None are acids iv. HOBr is a base that produces OH - on dissolving in water
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This note was uploaded on 04/21/2009 for the course CHEM 105BL taught by Professor Warshel during the Spring '07 term at USC.

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Exam 2 Key - Chemistry 105 B Exam 2 03/05/09 Dr. Jessica...

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