Sp_10_Parr_E2_key

Sp_10_Parr_E2_key - Chemistry 105 B Exam 2 03/04/10 Dr....

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1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 2 Name: ______________________________ 03/04/10 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Parr Lab TA’s Name: ___________________________ Lab: Tu 9/ Tu 1/ Tu 4 / W 1 / W 4 / F 1 Please circle lab section above . Question Points Score Grader 1 24 2 14 3 5 4 6 5 4 6 8 7 7 8 8 9 8 10 8 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. 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. 3. If necessary, please continue your solutions on the back of the preceding page (facing you). 4. You MUST submit all pages to the proctors, including the periodic table page. Put your name onto the periodic table page in the space provided . 5. You MUST use black or blue ink in order to be eligible for any regrades. (No whiteout, no erasable ink, no pencil.) 6. Only a Casio FX-260 calculator may be used on Chem 105a/b exams. 7. Turn off cell phones and other electronic communication devices and put them away, out of sight. They may not be taken out of your bag during the exam. 8. When time is called, stop working on your exam immediately, turn the exam over and pass it to the aisle. 9. Good luck!! =) First Letter of Last Name
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2 1. (24 pt) Answer the following multiple choice questions. i. HX (molar mass = 150. g/mol) and HY (molar mass = 50.0 g/mol) are weak acids. A solution of 12.0 g/L of HX has the same pH as one containing 6.00 g/L of HY. Which is the stronger acid? a. HX b. HY c. both have the same strength d. cannot be determined from the information given ii. Designate the conjugate Brønsted-Lowry acid for each of the following bases: NH 3 , CN - , and NH 2 - a. NH 3 , HCN, NH
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This note was uploaded on 03/24/2010 for the course CHEM 105B taught by Professor Bau during the Spring '08 term at USC.

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Sp_10_Parr_E2_key - Chemistry 105 B Exam 2 03/04/10 Dr....

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