key-q4ab - Quiz Number 4 Chemistry 122, Dr. Mathews Monday,...

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Unformatted text preview: Quiz Number 4 Chemistry 122, Dr. Mathews Monday, Feb 12, 2007 Name . ‘ Carmen ID Lab Instructor/Section No: 1. (8 pts) Considerthe following reaction mechanism: ' @ H202 7H20+,o’ (9 gym—5% ~w+cFfi 4/sz +55 —>//Zfl +07%, @ C10+'Q3'.->¢€1+202 _@ zfigga quack / a) Write the molecularity of each elementary step to the‘left of the reaction. b) Write the overall equation for the reaction to the right of the mechanism. c) Identify the reactionintermediate(s). 0/ Msz ) &, 060/4114 2. (6 pts) The follOwing mechanism has been proposed for the gas-phase reaction of NO with H2 to form N20 and H20: . No we -> m (1) W+ H2 —> N20 + H20 (2) a) What is the overall balanced equation for the reaction? ag/l/fl 7L /7/2 “’9 W20 +420 b) Write a rate law for each elementary step. 1 a mm: A W11 (2 me. -=- z [W EH73, c) The observed rate law is Rate .'= k[NO]2[H2]. What can you conclude about the relative speeds of equation (1) and (2) ? , (z) is 7% shut 6+9? 3. (6 pts) The oxidationzof SO2 to SO3 is catalyzed by N02. * The reaction proceeds according to the following elementary steps: 2 09mg) i SO. (g) *N0 (g) + $03 (g9 2N0 (g) 02 (g) _’ W2 (9 a) Show that the two reactions can be summed to give the overall oxidation of $02 by 02 to give 803. V b) Why do we consider NO2 as a catalyst and not an intermediate in this reaction? £43 used in “fine {32* 57%;}? and rarivr‘neal in \Me 3a!me l c) What is the role of NO in the above mechanism? re 85bqu mil? Mac/[fie Quiz Number 4 ‘ ‘ Chemistry 122, Dr. Mathews Wednesday, Feb 14, 2007 Name L Carmen ID ‘ Lab Instructor/Section No: 1. (8 pts) Consider the following reaction mechanism: » A + B -* C + D - 7 (1) fast, reversible F, , «’7 Def c + E —»,F (2) slow 14 *gl'g a) Write the overgll reaction to the right of the mechanism. I bu k‘FZ 1i” [D] V b) Write the rate law that corresponds to the mechanism. 44 [5] We "A mpg {@233 “5ij gm fir m 2. (6 pts) The gas-phase reaction 2N0 + Cl2 -’ 2NOCl seems to be explained by the following mechanism. N0 + c12 —~’, N0012 (1) NOCl2 + NO -v 2NOC1 (2) a) What wodz: be the rate 1an if the first step were the slow one? nave = , mm) b) What would the rate law if the second step were the slow one? rare/:uéjfwaflimj 9 [xx/ad)»: :[wg arm: 77/) 1M 0) Do the elementary steps add up to the overall reaction? What is the significance of NOCIZ? )Zfi/ is & T330999 )YHE‘I‘MQHO/fafilev 3. (6 pts) The oxidation of SO2 to SO3 is catalyzed by N02. The reaction proceeds according to the following elementary steps: ‘ 7, [We +’ 802 (g) ~N€ng> + 803 (9) me) + 02 (g) -+ T1402 (g) a) Show that the two reactions can be summed to give the overall oxidation of SO2 by 02 to give 803. 259.7, 7L0; ‘9 £563 b) Why do we consider NO2 as a catalyst and not an intermediate in this reaction? f7Z 1'9 {/550/ 79) final/£2715 #6? (7979 me] 517+ 748 34404 c) What is the": role of NO in the above mechanism? raaaslrbe {firms}. JIM/6 ...
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This note was uploaded on 07/17/2008 for the course CHEM 122 taught by Professor Zellmer during the Winter '07 term at Ohio State.

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key-q4ab - Quiz Number 4 Chemistry 122, Dr. Mathews Monday,...

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