examChr-07key

examChr-07key - Name Answer Key Seat - Chemistry 241 Exam 1...

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Unformatted text preview: Name Answer Key Seat - Chemistry 241 Exam 1 May 22, 2007 Honor Pledge: I have neither given nor received help on this exam, nor have I seen anyone else do so. Signed:__________________________________ 1. 2. 3. 4. 5. 6. 7. 8. 9. Total _________ 10 15 10 10 15 10 10 10 10 100 SHOW YOUR WORK CIRCLE NUMERICAL ANSWERS 1. (10 pts) A 12 oz. Coke can is determined to be 12.02 cm tall and 6.13 cm in diameter with a measurement uncertainty of 0.02 cm. What is the uncertainty in the volume of Coke in ounces? 3 2 2 355 2 cm h d h r V = = = 3 2 2 10 7 . 6 02 . 12 02 . 065 . 3 ) 01 )(. 2 ( . 2 1 = + = V e V 12 oz x 6.7x10-3 = 5.9x10-2 8.1x10-2 oz. 2. (15pts) Nonpolar compounds were separated by HPLC on an octadecyl (C 18 ) stationary phase. The eluent was 65% vol. methanol in water. If the percent methanol was changed to 50% a. How would the retention times be affected? EXPLAIN....
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This note was uploaded on 11/03/2009 for the course CHEM 241 taught by Professor Tiani during the Spring '08 term at UNC.

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examChr-07key - Name Answer Key Seat - Chemistry 241 Exam 1...

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