Exam%202%20Key - CHEM 1123 Fa112006 Exam 2 EXAM 2 CHEMISTRY...

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CHEM 1123 Fa11 2006 Exam 2 EXAM 2 CHEMISTRY 1123 October 17,2006 Name: I& Rules: No talking, do trading Calculators, No explosive flatulence, No use of any materials except pencil and Calculator, Place answer on NCS Form. 1, In the reaction 2A + 2B -+ C + 2D If the rate of disappearance of A is - 3.2 X MIS, What is the rate of formation of C? A) 3.2 X MIS B 6.4 X MIS C 1.6X M IS d D) 1.02 X MIS E) 5.6X MIS 2. lnitial Rate data were obtained for the following reaction: A + B + C + D Initial Initial Initial Experiment [A] [Bl rate 1 0.15 0.10 4.5 X 10-I 2 0.30 0.10 1 .8 3 0.15 0.20 9.0 X lo-' What is the rate law for this reaction? A) rate = k[A] B) rate = k[A][B] rate = ~[A]*[B] D) rate = ~ [ A ] ~ [ B ? - - E) rate = ~[A][B]~
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CHEM 1123 Fa11 2006 Exam 2 3. The decomposition of hydrogen peroxide is first order with a rate constant of -3 -1 3.66 X 10 s . If the initial concentration of hydrogen peroxide is 1.05 M, calculate the time in seconds, at which the hvdroaen ~eroxide decreases to 4. In the first order decomposition of dinitrogen pentoxide at 335 K If we start with 5.0 grams of N2O5, and have 3.2 grams after 95 s, What is the half life for the reaction (s)? (DP helper find k first) A) 247 B) 95 &w%fk-- = - A& C) 0.693 & 4&X 10-3 Lda> -3 4 (SS) ; R = y.+rlD 5. The rate constant, k, for the thermal decomposition of acetaldehyde is 0.10 1 -1 -1 -1 M- s at 500 K and 0.30 M s at 469 K. What is the value of the activation energy in kJlmol? CH3CHO(\) + CH4(g) + CO(g) D) -0.693 E) 32.0 -
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CHEM 1123 Fa11 2006 Exam 2 6. Consider the following 2- step mechanism, for the reaction of carbon monoxide with nitrogen dioxide.
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