Exam1_2008crib - EXAM 1 CHEMISTRY 224 FEBRUARY 5, 2008 1....

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EXAM 1 CHEMISTRY 224 FEBRUARY 5, 2008 1. Read the following instructions carefully 2. Write your name and Purdue ID number on the answer sheet 3. Write your Graduate Instructor’s name on the line for “Instructor” on the answer sheet 4. Use a #2 pencil to code all information on the answer sheet. 5. Code your name and Purdue ID number on the answer sheet 6. Code 0224 as the “Section number” on the answer sheet. 7. Code the one best answer to each question on the answer sheet. THERE ARE 20 QUESTIONS. CHECK NOW TO BE SURE THAT YOUR EXAM INCLUDES ALL 20 QUESTIONS. EACH QUESTION IS WORTH TEN (10) POINTS (200 POINTS TOTAL) YOU ARE SUPPOSED TO KNOW (REMEMBER) A NUMBER OF BASIC EQUATIONS. ADDITIONAL FORMULAS AND STATISTICAL TABLES ARE INCLUDED AT THE END OF THE EXAM. WE STRONGLY SUGGEST THAT YOU CHECK THE REFERENCE SECTION AT THE END OF THIS BOOKLET BEFORE YOU START WORKING ON THE EXAM. ATENTION: SOME OF THE QUESTIONS THAT LOOK LIKE THEY REQUIRE COMPLEX CALCULATIONS CAN ACTUALLY BE ANSWERED BY USING SIMPLE REASONING AND INTUITION.
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1. Analyst Ethan analyzed a sample of Bud Light beer and found the content of lactic acid to be 0.00052778 ± 0.00000691 M. What is the correct and appropriate form to present this result at the US Food and Drug Administration meeting: a. 0.00052778 ± 0.00000691 M b. 0.0005 ± 0.000007 M c. 0.528 ± 0.007 mM d. 0.00053 ± 0.00001 M e. 52.8 ± 0.7 µ M Answer: c. 2. Analyst Ethan carried out three repeat measurements of absorbance, resulting in the values A 1 , A 2 , and A 3 . He subsequently calculated the average absorbance, A . Unfortunately, his laboratory notebook has been compromised by an accidental spill involving the sample of Bud Light. The surviving notebook entries are A 1 =0.174, A 2 =0.161, and A =0.168. What was the value of A 3 ? a. 0.173 b. 0.162 c. 0.165 d. 0.169 e. 0.171 Answer: d 3. In the context of glucose determination experiment, the concept of sensitivity describes: a. how well the measurement scheme can discriminate between glucose and galactose b. how reproducible is any given measurement c. by how much transmittance T drops in response to an increase in glucose concentration d. how wide is the range of glucose concentrations where the measurement can be performed with the accuracy of 1% or better. e. by how much the absorbance A drops due to the presence of the stray light Answer: c. 4. You are working in a Quality Control laboratory for Eli Lilly down in Indianapolis. You have been tasked with making sure all the batches of Prozac® are up to specification standard and have a method (called a Standard Operating Procedure) to follow. Your superiors periodically slip a Prozac standard into your batch of tests. Why?
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a. Not many measurements are done, so more are needed to determine the average concentration of active compound in the pills, c . b. It is to make a one-point calibration curve. c. The true concentration true c is known for the standard pills. The accuracy of your measurements is therefore being assessed.
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This note was uploaded on 04/07/2008 for the course CHEM 224 taught by Professor Scottmcluckey during the Spring '08 term at Purdue University-West Lafayette.

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Exam1_2008crib - EXAM 1 CHEMISTRY 224 FEBRUARY 5, 2008 1....

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