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



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