Chemistry > EXAM > University of North Carolina, Charlotte - CHEM 1252S14 1252 Exam 3 Key (All)

University of North Carolina, Charlotte - CHEM 1252S14 1252 Exam 3 Key

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Chemistry 1252 Exam #3 (75 minutes) March 31, 2014 First Name Last Name Signature SID# 800- You must sign to affirm that you have followed the UNC Charlotte Student Code of Academic Integrity, o... r your exam will not be graded. Please check the section in which you are enrolled: Michael (001) 9:30 AM ______ Jew (002) 2:00 PM _______ Please read each question carefully and answer it completely and clearly. The exam should have 6 pages for a total of 17 questions. Individual point values for free response are given in the corner of each answer space. You must show your work to receive any credit for problems involving calculations. All calculated answers must include units, and should be rounded to the appropriate number of significant figures! Additional equation: ( ) ( ) Page Points Score Grader 2 12 3 23 4 18 5 20 6 27 Total 100 https://www.coursehero.com/file/10746011/S14-1252-Exam-3-Key/ This study resource was shared via CourseHero.comA 2 Free Response Instructions: Solve the following problems in the boxes provided with each question. Be sure to show all your work, including units, and round your answers to the appropriate significant figures. 1. Consider the synthesis of NO and Cl2 to form NOCl, 2 NO(g) + Cl2(g) 2 NOCl(g). This overall reaction is first-order with respect to [NO] and first-order with respect to [Cl2]. (a) Write the overall rate law for this mechanism. (b) Write the overall rate law for this mechanism. (Be specific about which k values you include.) (Be specific about which k values you include.) Rate = Rate = +2 all or nothing +4 correct answer (+1 only if Step 2 used, or if incorrect substitution) (c) Which mechanism(s), (a) and/or (b), are consistent with the overall rate law? Circle your answer. +1 (consistent with (a) and (b)) (d) Draw a reaction profile on the potential energy/ I Reaction coordinate diagram depicting Mechanism (b). (i) Assume that the reaction is exothermic. reactants (ii) Label the reactants “R”, products “I”, and intermediate as “I”. E (iii) Label the activation energy for the first step using an arrow, paying careful attention to its length. +1 R > P + labels products +1 I labeled +1 2 hills reaction coordinate +1 2nd hill higher +1 correct Ea label Step 1: NO(g) + Cl2(g) NOCl2(g) slow Step 2: NO(g) + NOCl2(g) 2 NOCl(g) fast k1 k2 Step 1: NO(g) + NO(g) N2O2(g) fast Step 2: N2O2(g) + Cl2(g) 2 NOCl(g) slow k1 k– 1 k 2 2 4 k1[NO][Cl2] k1k2[NO]2[Cl2] k–1 Mechanism (a) Mechanism (b) both neither 1 5 https://www.coursehero.com/file/10746011/S14-1252-Exam-3-Key/ This study resource was shared via CourseHero.co [Show More]

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