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Entry Task: Dec 7 th Friday

Entry Task: Dec 7 th Friday. Question: Provide the 2 nd order integrated equation and when plotting for a 2 nd order reaction what labels would be on the x and y axis? You have 5 minutes! . Agenda:. Discuss the Integrated Rate Law ws Field any questions that might arise

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Entry Task: Dec 7 th Friday

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  1. Entry Task: Dec 7th Friday Question: Provide the 2nd order integrated equation and when plotting for a 2nd order reaction what labels would be on the x and y axis? You have 5 minutes!

  2. Agenda: • Discuss the Integrated Rate Law ws • Field any questions that might arise • HW: Rate Laws and Order ws

  3. The reaction 2A  B is first order in A with a rate constant of 2.8 x 10-2 s-1 at 800C. How long will it take for A to decrease from 0.88 M to 0.14 M ? PLUG & CHUG k = 2.8 x 10-2 s-1 SET IT UP ln [A]0 = [0.88 M] ln [0.14M]t = [X] t = X ln [0.14 M]t = (X) -(2.8x10-2) + ln [0.88 M] (X) -1.97 = -(2.8x10-2) + (-0.128) Get X by itself -1.97 - + 0.128 66 second 2.8x10-2

  4. As described in Exercise 14.28, the decomposition of sulfuryl chloride, SO2Cl2, is a first-order process. The rate constant for the decomposition at 660 K is 4.5 x 10-2 s-1. a) If we begin with an initial SO2Cl2 pressure of 340 torr, what is the pressure of this substance after 75s? k = 4.5 x 10-2-s-1 ln [A]0 = [340 torr] SET IT UP ln [X torr]t = [X] t = 75 s + ln [340 torr] ln [X torr]t = -(4.5 x 10-2) (75 s) ln[torr]t= 3.375 + (5.83) ln[torr]t= 2.455 Get rid of ln by ex on both sides [torr]t= e2.455= 11.6 torr or 12 torr

  5. 3. Consider the hypothetical aqueous reaction A(aq)  B(aq). Moles of A are monitored with respect to time. Determine SHOW EACH GRAPH whether the reaction is first or second order. -2.72 -2.89 -3.02 ln][A] -3.17 -3.32 -3.47 -3.62 40 10 20 30 Time (s) 33.4 30.4 27.4 24.4 21.4 18.4 15.4 40 10 20 30 Time (s)

  6. 3. Consider the hypothetical aqueous reaction A(aq)  B(aq). Moles of A are monitored with respect to time. What is the value of the rate constant for the reaction? Include units 19.61= (X)(10) + 15.38 19.61-15.38 = (X) 10 Rate constant is 0.42 M-1s-1

  7. 4. Consider the hypothetical aqueous reaction A(aq)  B(aq). Moles of A are monitored with respect to time. Determine SHOW EACH GRAPH whether the reaction is first or second order. -2.05 -2.36 -2.67 ln][A] -2.98 -3.29 -3.60 -3.91 160 40 80 120 Time (s) 50 40 30 20 10 160 40 80 120 Time (s)

  8. 3. Consider the hypothetical aqueous reaction A(aq)  B(aq). Moles of A are monitored with respect to time. What is the value of the rate constant for the reaction? Include units -2.70 = -(X)(40) + -2.30 -2.70-(-2.30) = (X) -40 Rate constant is 0.01 s-1

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