CH302 Practice Quiz 5 on Kinetics1. The rate of the reaction2NH3 ‡ N2 + 3H2is equal to1. -3D[ NH3]/ D t2. + D [ NH3]/3 D t3. -2 D [ NH3]/ D t4. - D [ NH3]/2 D t5. + D [ NH3]/2 D t2. What are the units of the rate constant for the reactionPOCl + Cl2 ‡ POCl3With a rate expression: rate = k [POCl]1. M-2 sec -12. M-1 sec -13. M0 sec –14. M sec 15. M0 sec 13. The following data were collected for the reactionA + B ‡ Cat a particular temperature. Three experiments yield the following data:Initial Initial rateTrial [A] [B] [C]1 0.4 0.2 4 x 10-32 0.8 0.2 4 x 10-33 0.8 1.2 144 x 10-3What is the rate-law expression for thisreaction?1. 0.1 M-1s-1[B]22. 0.4 M-1s-1 [B][A]23. 0.1 M-1s-1 [A][B]24. 4 x 10-3 M-1s-1 [B][A]24 The reaction2NH3 ‡ N2 + 3H2is second order. At a certain temperature it has a rate constant of 0.15 M-1s-1At this temperature, how long would it take for 40% of a given sample to decompose?1. 2.2 sec.2. 5 sec.3. 4.44 sec.4. 10 sec.5 Which of the following statements is true:1. Activation energy increases with temperature.2. Catalysts are used to decrease the pre-exponential factor in the rate expression3. Reaction rate increases with increasing activation energy4. Endothermic reactions have a higher activation energy than exothermic reactions6 For a reaction the rate constant is 6 x 105sec-1 at 25oC. If A is 6.2 x 1012, what is the activation energy?1. 40kJ/mol2. 40 J/mol3. 3.3 kJ/mol4. -40kJ/mol5. -3.3 kJ/mol7. Consider the multi-step reaction that has the overall reactionNO2 + CO -----> NO + CO2What would be the observed rate expression given the proposed reaction mechanism below?NO2 +NO2 -----> NO3 +NO fastNO3 + CO ----> NO2 + CO2 slow1. Rate = k [NO2]2. Rate = k [NO2] 23. Rate = k [NO2] 2 [CO]/[NO]4. Rate = k [NO2] 2 [CO][NO]5. Rate = k [NO2] [CO]/[NO]8. Consider the reaction coordinate for A ‡ BWhat is the activation energy for A ‡ B ?1. 100 kJ/mol rxn2. 200 kJ/mol rxn3. 300 kJ/mol rxn4. 150 kJ/mol rxn5. 250 kJ/mol rxn300 kJ200 kJ50
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