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# [Exam Tutorial] CHM139 Term Test 2 Winter 2011 Questions

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School
University of Toronto St. George
Department
Chemistry
Course
CHM135H1
Professor
all
Semester
Winter

Description
TT2 2011 1. Consider the reaction H (g) + I (g) => 2 HI(g). The relationship between the rate of 2 2 disappearance of I an2 the rate of formation of HI is: a) -Δ[I2]/Δt = +Δ[HI]/Δt b) -Δ[I2]/Δt = +2Δ[HI]/Δt c) -2Δ[I 2/Δt = -Δ[HI]/Δt d) -2Δ[I2]/Δt = +Δ[HI]/Δt e) -Δ[2 ]/Δt = -Δ[HI]/Δt 2. Consider the following statements about a chemical reaction: i) The forward reaction rate increases as the reaction gets going ii) The forward reaction rate always equals the reverse reaction rate iii) Since a catalyst affects forward and reverse rates differently, the yield of product is increased a) Only statement i) is true b) Only statement ii) is true c) Only statement iii) is true d) Only statements ii) and iii) are true e) None of the statements are true 3. The following rate data was obtained by students for the reaction between hydrogen peroxide and iodide under acidic conditions: Run [H2O 2 (M) [I] (M) Initial rate (M/s) 1 0.0080 0.015 1.16 x 10 -6 2 0.020 0.015 2.91 x 10 -6 3 0.020 0.0060 1.16 x 10 -6 The correct empirical rate law and value of the rate constant for this reaction are: a) Rate = k[H O 2[I2, k = 9.7 x 10 M s -3 -1 -1 2 - -1 -2 -1 b) Rate = k[H O 2 [2], k = 1.0 x 10 M s c) Rate = k[H O 2[I2 , k = 1.4 x 10 s -4 -1 0 - 1 -5 -1 d) Rate = k[H O 2 [2] , k = 7.7 x 10 s e) Rate = k[H O 2 [2] , k = 8.0 x 10 M s 1 -3 -1 4. Phosgene is formed by the reaction CO(g) + Cl (g) => COCl (g2, for which th2 activation energy is 135 kJ/mol. At what temperature will the reaction be 1000 times faster than it is at 125 °C for the same initial amounts of CO and Cl ? 2 a) 153 °C b) 180 °C c) 206 °C d) 233 °C e) 259 °C 5. Iron oxide ores are reduced to iron metal by exothermic reaction with carbon monoxide FeO(s) + CO(g)  Fe(s) + CO (g) 2 Which of the following changes in condition will cause the equilibrium to shift to the right? a) add FeO b) remove CO c) add CO 2 d) halve the volume e) reduce the temperature 6. For which of the following polyprotic acids is the first ionization step approximately 100%? a) H 2 b) H 2O 3 c) H 2O 3 d) H 2O 4 e) H 3O 4 -5 7. What is the pH of a 0.375 M solution of benzoic acid? [K = 6.a x 10 ) a) 8.9 b) 5.1 c) 2.3 d) 0.43 e) 11.7 8. Which of the following titrations result in an acidic solution at the equivalence point? a) CH 3OOH titrated with NaOH b)
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