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H15_Kinetics 2 - krohn(tek335 H15 Kinetics 2 Mccord(52445...

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krohn (tek335) – H15: Kinetics 2 – Mccord – (52445) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The reaction 2 NO(g) + 2 H 2 (g) N 2 (g) + 2 H 2 O(g) is first-order in H 2 and second-order in NO. Starting with equal concentrations of H 2 and NO, the rate after 25% of the H 2 has reacted is what percent of the initial rate? 1. 1.56% 2. 6.25% 3. 42.2% correct 4. 75.0% 5. 56.3% Explanation: 002 10.0 points A reaction has k = 8 . 39 M 1 · s 1 . How long does it take for the reactant concentration to drop from 0.0840 M to 0.0220 M? 1. 1.42 s 2. 2.00 s 3. 5.42 s 4. 8.39 s 5. 4.00 s correct Explanation: 003 10.0 points The graph is a plot of ln A vs t for the reaction A B 1 2 3 4 5 0.2 0.4 0.6 0.8 1.0 1.2 rate = k [A] is the rate law for this reaction. What was the initial concentration of [A]? 1. 0.6 M 2. 5 M 3. 1.8 M 4. 3.0 M correct 5. 1.1 M Explanation: 004 10.0 points Consider the mechanism ClO (aq) + H 2 O( ) HOCl(aq) + OH (aq) K , fast I (aq) + HOCl(aq) HOI(aq) + Cl (aq) k 1 , slow HOI(aq) + OH (aq) OI (aq) + H 2 O( ) k 2 , fast What is the rate law? 1. rate = k 1 [I ] [HOCl] 2. rate = k 1 K [ClO ] [I ] 3. rate = k 1 k 2 K [ClO ] [I ] 4. rate = k 1 K [ClO ] [I ] [OH ] 5. rate = k 1 K [ClO ] [I ] [OH ] 1 correct Explanation: 005 10.0 points Consider the mechanisn
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krohn (tek335) – H15: Kinetics 2 – Mccord – (52445) 2 NO 2 (g) + F 2 (g) NO 2 F(g) + F(g) slow F(g) + NO 2 (g) NO 2 F(g) fast What does the reaction profile show? 1. one maximum for the second step 2. two maxima, the first being highest cor- rect 3. two maxima, the second being highest 4. two maxima, both the same height Explanation: 006 10.0 points For a multistep reaction the observed order of the reaction is generally determined by the 1. time at which the concentrations of all species are measured.
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