2009_exam_1 - CHM 3120 Exam 1(Form Code A Instructions On...

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CHM 3120 Exam 1 (Form Code A) September 17, 2009 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 sensitivity (C) The y-intercept must be close to zero for reliable results from a calibration curve (D) Straight line calibration curves are desirable but not required 2. The salinity of the Great Salt Lake was measured to be 19 parts per thousand sodium chloride. Calculate the molarity of the sodium ion in the Great Salt Lake. (A) 0.82 molar (B)0.46 molar (C) 2.3 x 10 -2 molar (D) 3.2 x 10 -1 molar (E) other 3. The concentration of copper in a drinking water sample was found to be 11 ppb. Express the ppb concentration in molarity. (A) 1.3 x 10 -6 (B) 1.7 x 10 -7 (C) 1.3 x 10 -8 (D) 1.7 x 10 -6 (E) other 4. An analytical procedure required the preparation of a solution containing 100 ppm chromium. How many grams of potassium dichromate (K 2 Cr 2 O 7 ) would be required to prepare 500 mL of this
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2009_exam_1 - CHM 3120 Exam 1(Form Code A Instructions On...

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