key-q4ce - Quiz Number 4 i ' Chemistry 122, Dr. Mathews...

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Unformatted text preview: Quiz Number 4 i ' Chemistry 122, Dr. Mathews Tuesday, Feb 13, 2007 Name I I , Carmen ID Lab Instructor/Section No: 1. (8 pts) Consider the following reaction mechanism: I I N02c1 -—> N92 21’ 2 £11pr —>H(J:rl+.erfi' No.52 +/¥;D-*> flirt/fl} + M6 3 ofi+l§ol+pz§ ~HNo3+)(2 ‘ k 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. 0) Identify the reaction intermediate(s). ‘A/az/ 46/ 0/4] 2. (6 pts) The following mechanism has been proposed for the gas-phase reaction of H2 and ICI: H2(g)""+1c1 (g) -’/H1'(g)+HC1 (g) (1) Ian/(g) +ICI (g) -v 12 (g) +HCI (g) (2) a) Write the balanced equation for the overall reaction. ht; + 23304, a.) 2, HM + I; b) Identify any intermediates in the reaction and state whether or not they are catalysts. ALI * YIO+ a ce‘tak‘l’ \ c) Write rate laws for each of the elementary steps of the mechanism. WAC" : “again—4’3 Taiez 3 "/3; [#:22le ween! 720 $415. #2— d) If reaction (1) is slow and (2) is fast, what is the predicted rate law for the overall reaction? . rav’a : 4%, [#212le 3. (6 pts) NO catalyzes the decomposition of N20, possibly by the following mechanism: 2(ng> + N20. kgi —> N. (g) +1962 (9) 2/N02 (g) -> TNQ (g) + 02 (g) a) What is the chemical equation for the overall reaction? b) Why is NO considered a catalyst and not an intermediate? (Lam/56f 5/205 27‘ Mifiafa #75 175.7%?!) éaf f s V‘efurnal GL c) If experiments show no accumulation of NO2 in measurable quantities during the decomposition of N20, what can you conclude about the proposed mechanism regarding the role of NO2 and the relative speed of the first and second reactioqs? ’ / N0; is a. raw/m m I‘BfMéJWQ h r , 7% / 8440/ \Me 52ch 54649 )5 ‘Hzxs Mama/1a -/ fits/{I7} V79 344/ Nay, Friar/med v Quiz Number 4 ‘ Chemistry 122, Dr. Mathews Tuesday, Feb 13, 2007 Name , ‘ i r CarmenID Lab Instructor/Section No: l. (8 pts) Consider the following reaction mechanism: ‘ A + B -+ C + D ( 1) fast, reversible ‘ _ r. , ,4 “3+5 «*2 D + r- C + E -' F (2) slow * a) Write the overall reaction to the right of the mechanism. APE/fliggaélr j I “ b) Write the rate law that corresponds to the mechanism. I . a ‘ wall [<12er 41.4414 [42532551 firm bated). For [Q lw X D] 2. (6 pts) The gas-phase reaction 2N0 + C12 -’ 2NOCl seems to be explained by the following mechanism. ‘ NO + Cl2 ->7 NOClz‘ (1) NOCl2 + NO -> 2NOC1 (2) a) What would be the rate law if the first step were the slow one? r85“? = «fl; b) What would be the rate law if the second step were the slow one? rm ; 46,; [marzlfflfl (bf/WAS} fer 93%] c) Do the elementary steps add up to the overall reaction? What is the significance of NOClz? yas —- flag, a c? we 2&79495 234 film 0/204: 3. (6 pts) The oxidation of 802' to SO3 is catalyzed by N02. The reaction proceeds according to the following elementary steps: 1 (Mg) +802 (g) "91669 + 803 (g) 2M? (g) + 02 (g) —» are; (g) a) Show that the two reactions can be summed to give the overall oxidation of SO2 by 012 to give 803. b) Why do we consider NO2 as a catalyst and not an intermediate in this reaction? a z . . x . .L + m m vo/Vea/m {far/L»; \Me regatta; barf m‘furmJ 27¢ 8% V. c) What is the role of NO in the above mechanism? ‘ VEoW/fi/e /;)7l€rmez//.2a7la ( Quiz Number 4 ‘ Chemistry 122, Dr. Mathews ’ Thursday, Feb 15, 2007 Name C ‘ Carmen ID A Lab Instructor/Section No: 1. (8 pts)Consider the following reaction mechanism: A -’ B + C (1) fast, reversible C + D -’ E (2) fast, reversible E —> F ' (3) slow a) Write the overall reaction to the right of the mechanism. b) Write the rate law that corresponds to the mechanism. 2. (6 pts) The overall reaction of gases nitrogen dioxide and fluorine has a suggested mechanism of: N02+F2 _—> N02F+F (1) slow F + N02 —> N021: (2) fast a) What is the equation for the overall reaction? b) What would be the expression for the rate of the overall reaction with this mechanism?- c) What is the role of F in this mechanism? 3. (6 pts) NO catalyzes the decomposition of N20, possibly by the following mechanism: Nee) + N20, (g3 —~ N; (g) + 527(9) Z/NC? (g) *Z‘NQ (g) + 02 (g) a) What is the chemical equation for the overall reaction? —> 2%), b) Why is NO‘A considered a catalyst and not an intermediate? f7‘ /5 m Who/23 “sedan f 7» L535 4W ref/WM} ,fn r7252» grap*')ca/,ewafi~« c) Ifexperiments show no accumulation of NO2 in measurable quantities during the decomposition of N20, what can you conclude about the proposed mechanism regarding the role of NO2 and the relative speed of the first and second reactions? 23/51? /5 o7 negaéfl Mfimaa’ké / I '2 07m! Var: Seam/571W 35 7575i 7%; Mmzké/ * [my y/ «fly fly Qw/mo/l ...
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This note was uploaded on 06/11/2011 for the course CHM 122 taught by Professor Woodward during the Winter '07 term at Ohio State.

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key-q4ce - Quiz Number 4 i ' Chemistry 122, Dr. Mathews...

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