Kinetics Arrhenius & Activation Energy-problems

Kinetics Arrhenius & Activation Energy-problems - smith...

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Unformatted text preview: smith (jds5277) Kinetics Arrhenius & Activation Energy kimbrough (1234) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Remember in order to receive full credit you must show your work. You scratch work is do on the Monday we return from Spring Break. 001 10.0 points The reaction 2 HI H 2 + I 2 has rate constants k 1 = 9 . 7 10 6 M 1 s 1 and k 2 = 0 . 097 M 1 s 1 at T 1 = 326 . 85 C and T 2 = 526 . 85 C. What is the activation energy of this reaction? 1. 1 . 84 10 5 J 2. 7 . 93 10 3 J 3. 7 . 16 10 7 J 4. 6 . 59 10 4 J 5. 2 . 86 10 4 J 002 10.0 points Which one of the following four is not included in the Arrhenius equation? 1. specific rate constant 2. mass of the catalyst 3. absolute temperature 4. activation energy 003 10.0 points According to the Arrhenius equation for the rate constant of chemical reaction, the higher the activation energy, the ? at a given temperature. 1. slower the reaction 2. more endothermic the reaction 3. faster the reaction 4. more exothermic the reaction 5. more atoms are involved in a reaction 004 10.0 points An Arrhenius plot allows one to determine the ? by knowing the ? at different ? . 1. free energy; entropy; temperatures 2. rate constant; reaction rate; concentra- tions 3. entropy; enthalpy; temperatures 4. enthalpy; pressures; temperatures 5. activation energy; specific rate constant; temperatures 005 10.0 points Calculate the activation energy of a reaction if the rate constant is 0.9 s 1 at 25 C and 12.5 s 1 at 75 C. The universal gas constant is 8.314 J/mol K. ln parenleftbigg k 2 k 1 parenrightbigg = E a R parenleftbigg 1 T 1- 1 T 2 parenrightbigg 1. 26.4 kJ/mol 2. 820 J/mol 3. 19.7 kJ/mol 4. 31.8 kJ/mol 5. 45.4 kJ/mol 006 10.0 points What is the activation energy for a reaction which proceeds 50 times as fast at 400 K as it...
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This note was uploaded on 03/23/2012 for the course CHEMISTRY 101 taught by Professor Mrs.kimbrough during the Spring '12 term at University of Alabama at Birmingham.

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Kinetics Arrhenius & Activation Energy-problems - smith...

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