Exam1_2007crib

Exam1_2007crib - EXAM 1 CHEMISTRY 224 FEBRUARY 8 2007 1...

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EXAM 1 CHEMISTRY 224 FEBRUARY 8, 2007 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. 8. Statistical tables are included at the end of this exam THERE ARE 20 QUESTIONS. CHECK NOW TO BE SURE THAT YOUR EXAM INCLUDES ALL 20 QUESTIONS. STATISTICAL TABLES ARE INCLUDED AT THE END OF THE EXAM. EACH QUESTION IS WORTH TEN (10) POINTS (200 POINTS TOTAL) YOU ARE SUPPOSED TO KNOW (REMEMBER) ALL BASIC EQUATIONS. IF IT SEEMS THAT YOU NEED A CERTAIN COMPLICATED FORMULA WHICH IS NOT GIVEN IN THE TEXT OF THE EXAM WE SUGGEST THAT YOU HAVE A CLOSER LOOK AT THE PROBLEM – PERHAPS, IT CAN BE SOLVED WITHOUT USING THE FORMULA!
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1. Which one of the following statements is false: a. Precision can be estimated based on a series of replicate measurements b. For an arbitrary measurement, accuracy of the measurement is typically better than precision of the measurement. c. Running different experiments to measure the same quantity improves accuracy. d. The precision of the measurement can be usually characterized by Gaussian distribution. e. Accuracy is affected by systematic errors. Answer: b. 2. A calibration curve is made for Experiment 4 (Absorption Spectrophotometry: Fe(II) determination) and is fit to a linear function. This function describes the relationship between a. Concentration of phenanthroline and % transmission at a particular wavelength. b. Concentration of Fe 2+ and % transmission at a particular wavelength. c. Concentration of Fe 2+ and Absorbance over all wavelengths. d. Concentration of Fe 2+ and Absorbance at a particular wavelength. e. Concentration of Fe 2+ and Total Ion Current. Answer: d 3. A series of three numbers reads: 1, 3, 7. Please, determine the mean and the median of this series. Which of the following statements is true: a. The mean is greater than the median b. The median is greater than the mean c. The mean is equal to the median d. The median is greater than any number in the series e. The mean is greater than any number in the series Answer: a 4. Now imagine a series of three arbitrary numbers. Which of the following statements is true: a. The mean is always greater than the median (for any set of three numbers) b. The median is always greater than the mean c. The median is always equal to the mean d. The mean can be greater or equal to the median, but not less than the median e. The mean can be either greater, or equal to, or less than the median
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Answer: e 5. Given: solution of HClO 4 with concentration 8.00 mol/l (given volume – as much as you need). Required: solution of HClO 4 with concentration 0.250 mol/l (required volume 4.00 liters). Describe the preparation procedure.
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Exam1_2007crib - EXAM 1 CHEMISTRY 224 FEBRUARY 8 2007 1...

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