UB CHE 102LEC - Test_1_Review (5 pages)

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Test_1_Review



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Test_1_Review

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Pages:
5
School:
University at Buffalo-SUNY
Course:
Che 102lec - General Chemistry Lecture
General Chemistry Lecture Documents
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Chemistry 102 REVIEW QUESTIONS Test 1 1 Hydrogen iodide decomposes at 800 K via a second order process to produce hydrogen and iodine according to the following chemical equation 2 HI g H2 g I2 g At 800 K it takes 142 seconds for the initial concentration of HI to decrease from 6 75 10 2 M to 3 50 10 2 M What is the rate constant for the reaction at this temperature 2 The equilibrium constant is given for one of the reactions below Determine the value of the missing equilibrium constant H2 g Br2 g 2 HBr g 4 HBr g 2 H2 g 2 Br2 g Kc 3 8 104 Kc 3 The reaction below has a Kp value of 41 What is the value of Kc for this reaction at 400 K N2 g 3 H2 g 2 NH3 g 1 4 The first order reaction SO2Cl2 SO2 Cl2 has a half life of 8 75 hours at 593 K How long will it take for the concentration of SO2Cl2 to fall to 16 5 of its initial value 5 In aqueous solution hypobromite ion BrO reacts to produce bromate ion BrO3 and bromide ion Br according to the following chemical equation 3 BrO aq BrO3 aq 2 Br aq 1 1 A plot of 1 BrO vs time is linear and the slope is equal to 0 056 M s If the initial concentration of BrO is 0 80 M how long will it take one half of the BrO ion to react 6 The reaction that occurs in a Breathalyzer a device used to determine the alcohol level in a person s bloodstream is given below If the rate of appearance of Cr2 SO4 3 is 1 64 M min at a particular moment what is the rate of disappearance of C2H6O at that moment 2 K2Cr2O7 8 H2SO4 3 C2H6O 2 Cr2 SO4 3 2 K2SO4 11 H2O 2 7 Consider the following reaction and its equilibrium constant 4 CuO s CH4 g CO2 g 4 Cu s 2 H2O g Kc 1 10 A reaction mixture contains 0 22 M CH4 0 67 M CO2 and 1 3 M H2O Which direction will the reaction proceed to reach equilibrium 8 Consider the endothermic reaction shown below C2H4 g I2 g C2H4I2 g If you were a chemist trying to maximize the amount of C2H4Cl2 describe 3 different tactics that you might try to achieve this 9 A certain substance X decomposes Fifty percent of X remains after 100 minutes How much X remains after 200 minutes if the reaction order with respect to X is a first order b second order 3 10 Consider the reaction in which HCl adds across the double bond of ethane HCl H2C CH2 H3C CH2Cl The following mechanism with the energy diagram shown below has been proposed for this reaction Step 1 HCl H2C CH2 H3C CH2 Cl Step 2 H3C CH2 Cl H3C CH2Cl a Based on the energy diagram determine which step is the rate determining step b What is the expected order of the reaction based on the proposed mechanism c Is the overall reaction endothermic or exothermic 4 ANSWERS 2 1 9 69 10 M 1s 1 10 2 6 9 10 4 3 4 4 10 4 22 7 hr 5 22 s 6 2 46 M min 7 No answer provided 8 No answer provided 9 a 25 b 33 10 No answer provided 5


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