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105af07_key_e2(2) - Chemistry 105a Exam#2 PLEASE PRINT YOUR...

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1 Chemistry 105a PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam #2 Name: _____________________________________________ 10/11/07 USC ID No: __________________________________________ Dr. Jessica Parr Lab TA’s Name: _____________________________________ Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 / F 1 Please circle lab section above Question Maximum Points Score Grader 1 14 2 14 3 18 4 10 5 8 6 10 7 16 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 your 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.) 4. There are 8 problems on 13 pages. Please count them before you begin. A periodic table is on the last page. 5. Good luck! =) First letter of last name
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2 1. (14 pts) Circle the correct answer. i. What is the concentration of potassium ions in a solution prepared by dissolving 27.2 g of potassium carbonate in 300.0 mL of water? a. 0.656 M b. 0.328 M c. 1.31 M d. 0.555 M e. 1.67 M ii. What would happen to the average kinetic energy of the molecules of a gas sample if the temperature of the sample increased from 20 o C to 40 o C? a. It would double. b. It would increase. c. It would decrease.
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