chem_13_quiz_1

chem_13_quiz_1 - Chem 13, Spring 2008 Professor Reaney Quiz...

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Chem 13, Spring 2008 NAME :____________________________ Professor Reaney DATE AND TIME: __________________ Quiz # 1: Total points = 50 Quiz Version: 1 2 3 4 5 6 Total Time: 30 minutes BE SURE TO INDICATE WHICH VERSION of THE QUIZ YOU HAVE on the SCANTRON or YOU WILL LOSE POINTS! This is a multiple choice exam. Select the BEST answer of the given choices. To receive full credit you must show your work on this page AND indicate correct answer on the scantron. Turn in both. Ambiguity leads to loss of points NOT GAIN of POINTS, so be clear. USE PENCIL ONLY on SCANTRON. 1. (5 pts) For the reaction: CO (g) + Cl 2 (g) COCl (g) + Cl (g) . Assume the rate laws are: k f [CO][Cl 2 ] = k r [COCl][Cl] or more precisely rate f = rate r . k f = 1.4 x 10 -28 M -1 s -1 and k r = 9.3 x 10 10 M -1 s -1 . What is K c for the reaction? a) 1 d) 6.64 x 10 -38 b) 6.64 x 10 38 e) 1.5 x 10 39 c) 1.5 x 10 -39 2. (3 pts) Which one of the choices below is an indication of the degree of accuracy in experimental results? a) coefficient of variation d) relative standard deviation b) relative error e) none of the choices provided c) mean and standard deviation 3. (3 pts) Standard deviation is an indication of: a) accuracy d) precision b) the Q-test e) reactions c) guard digits 4. (3pts) Given Beer’s Law, A = ebc, the units of A are: a) lumens d) M b) cm -1 * M -1 e) none of the choices provided c) cm 5. (3 pts) In absorbance spectroscopy not using λ max in the analysis commonly leads to: a) gross error in the standard curve d) random error in the standard curve b) a larger working range for the standard curve e) no choice is good c) a smaller working range for the standard curve 6. (3pts) The Q-test is good for evaluating: a) standard deviation d) the normal distribution of a population b) the presence of gross error e) none of the choices provided c) mean
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7. (3 pts) In absorbance spectroscopy which is most likely to affect ε for a molecule? a) using concentrations of analyte less than 0.01 M b) electronic noise of the instrument c) using concentrations of analyte greater than 0.01 M d) changing the pathlength of the cuvette e) none of the choices provided 8. (3pts) You are given an aqueous solution of HI. Ka in water for HI is: a) equal to 1 d) not enough info. is provided b) greater than 1 e) negligible c) less than 1 9. (3pts) HCl dissociates in water. Specifically for this reaction the strongest base is: a) Cl - d) H 2 O b) H 3 O + e) species not provided
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chem_13_quiz_1 - Chem 13, Spring 2008 Professor Reaney Quiz...

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