kinetics lab pdf.pdf

7 show the calculation for determining the rate

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7. Show the calculation for determining the rate constant, k, for trial 2 . 8. A completed Results Table #5. 9. The graph used to determine the activation energy, E a , for the reaction. Use Excel (or some other graphing program) to generate your graph via computer. See the instructions for this graph in AsULearn under the Kinetics topic. Follow these instructions carefully. Trial ln k 5 3.385 × 10 -3 -5.6 6 3.141 × 10 -3 -4.1 7 3.579 × 10 -3 -6.8 1 T (K 1 ) k = Rate ([I ] x )([S 2 O 8 2 ] y ) k = (4.8 × 10 6 M / s) (0.040M) 1 (0.040M) 1 k = 3.0 × 10 3

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ln k vs 1/T ln k -7.5 -7 -6.5 -6 -5.5 -5 -4.5 -4 -3.5 0.003100 0.003200 0.003300 0.003400 0.003500 0.003600 y = -6163.7x + 15.261 R 2 = 1 1/T (K -1 )
10. Calculate the numerical value for E a from the graph. Report E a in units of kJ/mole. E a = -(slope)(R) E a = -(-6163.7 K)(8.314 J/K mol) E a = 51.24 kJ/mole 11. Look back at your completed Results table #3. Discuss the implications of temperature as well as addition of a catalyst to the rate of the reaction. Are your rate constants, k, essentially constant for all trials. Should they be constant for all trials? Explain !!! My rate constants, k, are fairly constant for trials 1 through 5 and varied through trials 6, 7, and 8. They should vary in the final three trials, and not remain constant for all trials, because variables were manipulated prior to data collection. Trial 6 was heated, trial 7 was cooled, and a catalyst was added in trial 8. The manipulation in temperature caused the rate of the reaction to increase when the solution was heated and to decrease when the solution was cooled. An increase in temperature increases the rate of a chemical reaction due to an increase in the collision frequency of the particles in the reaction, while a decrease in temperature does just the opposite. In trial 8 the addition of a FeSO 4 /CuSO 4 catalyst provides a lower activation energy for the reaction, causing the rate of reaction to increase. 12. Answer the following questions. Show all work! 1. Give the correct chemical formulas for the following: a. calcium fluoride- CaF 2 b. hydrogen sulfide- H 2 S c. potassium persulfate- K 2 S 2 O 8 2. Determine the correct chemical names of the following species: a. MgO- magnesium Oxide b. NO (g)- nitric oxide c. N 2 O 5 - dinitrogen pentoxide

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3. Using the kinetic data in the table below, determine the rate law that the following reaction obeys.
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