CHM 3120 Exam 1 2010 Key

CHM 3120 Exam 1 2010 Key - CHM 3120 Exam 1 (Form Code A)...

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CHM 3120 Exam 1 (Form Code A) September 16, 2010 Instructions: On your scantron sheet enter your name, UF ID number (start on the first space and leave the last space blank), and Form Code (see above). This exam consists of 20 multiple choice questions each worth 10 points for a total maximum of 200 pts. You may retain your exam sheet. Turn in only the scantron. Bubbling errors of any kind will count as an incorrect response or result in the loss of points. 1. In Analytical Chemistry, we often use calibration curves. Which of the following statements is false concerning calibration curves? (A) Calibration curves permit the analysis of unknowns by comparison with standards (B) The slope of a calibration curve is a measure of a method’s detection limit. (C) Non-zero y-intercepts arise from blank contributions. (D) Straight line calibration curves are desirable but not required 2. A city’s water supply is fluoridated by adding NaF. The desired concentration of F - is 1.6 ppm. How many milligrams of NaF should be added per gallon treated water if the water already is 0.2 ppm in F - . (1gallon = 3.78 liters) (A) 50 mg (B) 5.3 mg (C) 11.7 mg (D) 18 mg (E) other 3. The concentration of copper in a drinking water sample was found to be 1.3 x 10 -8 M. Express the concentration in ppb. (A) 3.3 ppb (B) 11 ppb (C) 7.7 ppb (D) 0.84 ppb (E) other 4. An analytical procedure required the preparation of a solution containing 150 ppm chromium. How many grams of potassium dichromate (K 2 Cr 2 O 7 ) would be required to prepare 750 mL of this
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This note was uploaded on 10/13/2011 for the course CHM 3120 taught by Professor Harrison during the Fall '08 term at University of Florida.

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CHM 3120 Exam 1 2010 Key - CHM 3120 Exam 1 (Form Code A)...

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