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q3 ans - CHEM 0970(KOGUT QUIZ 3 SPRING 2008 MONDAY 1 PM 214...

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Unformatted text preview: CHEM 0970 (KOGUT) QUIZ 3 SPRING - 2008 MONDAY 2/04/08 1 PM - 214 CHEVRON NAME SCORE Points for each section will total 10 pts. 1. (4 pts.) Sketch the potential energy diagram for A2 + B2 —* 2 AB. The reaction is exothermic (AH; : -70 1d). The aetjyation energy (forward) is 60 kJ. b) Draw the transition state. Q'” B) I: if 1’13""3 2. (6 pts.) For a mechanism: Step I: NO(g) + “2 02¢) —> NOflg) h Step II: NOgm ‘v” N0(g} + 0(3) Step1“: 0mg) + 0e) —* 03w) a) Write the equation for the overall reaction. 22/02 “—303 W0 ' 2- 0 b) Nfl is a catalyst and ) 02 is an intermediate. e) Write the rate law for step Ill. 7201. wfimllfoj‘ CHEM 0970 (KOGUT) QUIZ 3 SPRING - 2003 MONDAY 2/04/08 6 PM - 217 EBERLY NAME SCORE Points for each section will total 10 pts. 1. (6 pts.) For a certain reaction, there is a suggested three step mechanism: Step I: H; + NO ——> H10 + N slow Step II: N + N0 —> N; + 0 fast Step Ill: 0 + H; —> H10 - fast a) What is the overall reaction? 2/42 + 2/1/04 N7, 7% 2&0 b) List any intermediates in this mechanism. c) The rate law for the overall reaction has been experimentally determined to be rate = k [H2] [N0]? Is this rate law consistent with the suggested mechanism? M0 H M Ma EA fly I ca flattné [#178103 2. (4 pts.) Sketch the potential energy diagram for a one-step reaction, A + B —> C + D. The activation energy for the forward direction is 100 RJ and the enthalpy of reaction is +40 kJ. What is the value of the activation energy in the reverse direction? CHEM 0970 (KOGUT) QUIZ 3 SPRING - 2008 THURSDAY 2/07/08 8 AM — 301 CHEVRON NAME SCORE Points for each section will total 10 pts. 1. (6 pts.) For NO in the upper atmosphere, Step I: N0(g) + 03(3) —’ NOztg) + 02(g} Step 11: 0(3) + NOHg) —> NOE) + 02¢) a) What is the overall reaction? b) NO. ls a catalyst; Ala—is an intermediate. c) Write the rate law for step I. x2412 :MOUIQQ 2. (2 pts.) Draw the transition state for step 11 in question #1. /“9 gavel @24wa 3. (2 pts.) For A2 + B; —> 2 AB, AH; : -50 Id. The activation energy for the forward process is 40.0 kJ. What is the value of the activation energy in the reverse direction? W 90 L) PG 2004]" 3222/ CHEM 0970 (KOGUT) QUIZ 3 SPRING - 2008 FRIDAY 2/08/08 1 PM - 301 CHEVRON NAME SCORE Points for each section will total 10 pts. 1. a) (2 pts.) What is the overall chemical reaction with the mechanism below? Step 1: Cl; H C1 + Cl Step 11: C1 + CH4 —> CH3 + HC] Step III: Cl + CH3 a CH3C1 vague A HC€+ 04ch b) (2 pts.) If step 1 is the slowest step, write the rate law for the overall reaction. 72972 lfifdgaj c) (2 pts.) List all intermediates in this mechanism. CH3)" Q9 2. (4 pts.) Sketch the potential energy diagram for the reaction C6H6 + NO; —> C6H5 NO: . The reaction has an activation energy in the forward direction of 80 k] and an activation energy in the reverse direction of 10 kJ. What is AH; in kJ/mol? I“ 20)” told) AHK is + 70K) Q+9+NQ+ ‘ g/Lé/VQ, ...
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