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2009_final_exam - CHM 3120 Final Exam(Form Code A...

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CHM 3120 Final Exam (Form Code A) December 17, 2009 Instructions: On your scantron sheet enter your name, UFID number (start on the first space and leave the last space blank), and Form Code (see above). This exam consists of 30 multiple choice questions each worth 10 points for a total maximum of 300 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.Which of the following is not a correct statement concerning mass spectrometry (MS)? (1) High MS resolution requires both magnetic sector and an ESA focusing. (2)Ideally all ions in MS have the same kinetic energy. (3) In calculating resolving power for MS, m/ ! m gives twice the value of m/m 1/2 . (4)A corona discharge operates at high pressure and high voltage. 2. What is the cell voltage when saturated calomel and Pt electrodes are dipped into a solution containing 0.40 M Br 2 (aq) and 0.250 M Br - ? Br 2 (aq) + 2e - ! 2 Br - E o = +1.098 V (1) +0.932 V (2) +0.413 V (3) +0.844 V (4) +0.881 V (5) other 3. Concerning detectors for gas chromatography, which statement is false? (1) The thermal conductivity (TC) detector responds only to analytes that increase detector conductivity. (2) Helium is used as the TC carrier gas because of its high thermal conductivity. (3)The flame ionization (FI) detector uses a hydrogen/air flame (4) The FI detector has much better detection limits than the TC detector. 4. Calculate the energy in joules of a single photon with a frequency of 1.132 x 10 15 sec - 1 . (1) 9.88 x 10 -17 (2) 2.65 x 10 -9 (3) 7.47 x 10 -19 (4) 6.7 x 10 -12 (5) other 5. Which of the following statements is not true? (1) A reacti "# %& ’()"*+, %’ !- %& #+.(/%)+0 (2) A positive !1 ’()"*& ( *+(2/%"#0 (3) If Q>K, the reaction must proceed to the right to reach equilibrium (4) Galvanic cells use spontaneous chemical reactions for current flow. 6. A 40.0 wt% solution of HBr in water has a density of 1.50 g/mL. How much solution is required to prepare 0.150 L of 0.180 M HBr? (1) 2.50 mL (2) 3.64 mL (3) 4.49mL (4) 3.98 mL (5) other 7. Find the milligrams of Cl - left in solution if 50 mL of 0.10 M AgNO 3 is added to 250 mL of solution that contains 0.210 g NaCl. K sp (AgCl) = 1 x 10 -10 (1)2.28 x 10 -4 (2) 1.58 x 10 -7 (3) 3.17 x 10 -7 (4) 4.5 x 10 -9 M (5) other 8.
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