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Unformatted text preview: 1 Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 4 Name: ______________________________ 11/24/09 Last 4 Digits of USC ID:____ ____ ____ ____ Lab TAs Name: ___________________________ Lab: W 1 / W 4 / Th 9/ Th 1/ Th 4 Please circle lab section above . Question Points Score Grader 1 24 2 12 3 10 4 8 5 8 6 8 7 10 8 12 9 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 9 problems on 7 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 2 1. (24 pt) Answer the following multiple choice questions. i. Which of the following processes decreases the atomic number by 1? a. gamma-ray production b. electron capture c. beta-particle production d. positron production e. at least two of the above processes decrease the atomic number by 1 ii. The number of half-lives needed for a radioactive element to decay to about 6% of its ii....
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This note was uploaded on 01/06/2011 for the course CHEM 105BLG taught by Professor Parr during the Spring '08 term at USC.

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