CH302 Spring 2009 Practice Quiz 5. The TA Version 1. Which of the following expressions would be equal to the rate of the reaction below? 2 KMnO4 + 3 Na2SO3 + H2O Æ 2 MnO2 + 3 Na2SO4 + 2 KOH 1. -(Δ[KOH] / 2·Δt) 2. -(Δ[Na2SO4] / Δt) 3. (2·Δ[MnO2] / Δt) 4. (Δ[H2O] / Δt) 5. -(Δ[Na2SO3] / 3·Δt) 6. -(Δ[KMnO4] / Δt) 2. Consider the data below: Experiment number [A] M [B] M [C] M [D] M initial rate M·s-1 1 0.025 0.03 0.04 0.056 1.04 x 10-6 2 0.025 0.12 0.04 0.056 4.16 x 10-6 3 0.025 0.015 0.08 0.056 5.2 x 10-7 4 0.075 0.03 0.01 0.056 9.36 x 10-6 5 0.025 0.06 0.07 0.112 1.04 x 10-6 What is the overall order of this reaction? 1. 1 2. 2 3. 3 4. 4 5. 5 6. 6 3. What would be the units of the rate constant (k) for the rate law below? rate = k·[O2]·[CO]-1·[Cl2]1 1. s-1 2. M-2·s-1 3. M-1·s-1 4. M1·s-1 4. Consider two hypothetical zero-order reactions. If reaction 1 is faster than reaction 2 at room temperature, but slower than reaction 2 at much higher temperatures, then reaction 1 must have the (larger/smaller) activation energy and must have the (larger/smaller) pre-exponential factor. (Hint: consider both the Arrhenius equation and combined Arrhenius equation.) 1. larger, smaller 2. larger, larger 3. smaller, smaller 4. smaller, larger 5. Consider the elementary reaction: H2CO3(aq) Æ CO2(aq) + H2O(l) If k = 3.6 x 102 s-1, and there is initially 0.781 M H2CO3, what is the [H2CO3] after 1.2 ms have passed? 1. 0.507 M 2. 0.349 M 3. 0.584 M 4. 1.203 M6. Consider the reaction: AgClO(aq) Æ 1/2 O2(aq) + AgCl(s) If an aqueous system initially has a [AgClO] of 112 mM and 3 minutes later has a [AgClO] of 7 mM, what is the half life of H2O2(aq)? 1. 90 seconds 2. 180 seconds 3. 60 seconds 4. 45 seconds 5. not enough information 7. To which of the following reactions would collision state theory not apply? (Note: consider the direction of the arrow in arriving at the correct answer). 1. N2(g) + 3 H2(g) Æ 2 NH3(g) 2. CH4(g) + 2 O2(g) Æ CO2(g) +2 H2O(g) 3. 2 H2(g) + O2(g) Æ 2 H2O(g) 4. CaCO3(s) Æ CaO(s) + CO2(g) 8. Consider the reaction mechanism below: step 1: 2 NO2(g) Æ 2 NO(g) + O2(g) step 2: Br2(g) + NO(g) Æ Br2NO(g) step 3: Br2NO(g) + NO(g) Æ 2 BrNO(g) overall: Br2(g) + 2 NO2(g) Æ 2 BrNO(g) + O2(g) If step 3 is the slow step, addition of which of the species below would slow down the observed rate of the reaction? 1. NO(g) 2. BrNO(g) 3. Br2(g) 4. O2(g) 5.
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