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Unformatted text preview: Form B 1. Given the following potential energy diagram for the reaction X + Y Z + R The arrow "d" represents the a. Transition state b. activation energy of the forward reaction c. Δ H for the reaction d. activation energy for the reverse reaction 2. Which of the following statements are TRUE about catalysts? I. A catalyst can increase the equilibrium constant for a reaction. II. A catalyst can speed up a forward reaction and slow down the reverse reaction. III. A catalyst provides a reaction pathway with a lower activation energy for the forward reaction. IV. A catalyst provides a reaction pathway with a lower activation energy for the reverse reaction. V. A catalyst changes the mechanism in a reaction. a. I and II b. I, III and IV c. III and IV d. III, IV and V 3. The reaction A + B C has a reaction rate which is experimentally observed to follow the relationship Rate=k[A] 2 [B]. The overall order of the reaction is a. first b. second c. third d. zero 4. At some time, the rate of formation of C is observed to be 0.036 mol/L per second for the reaction below. 2A + 3B 4C + 2D In order, what is the rate of change of A, the rate of change of B, and the rate of change of D (all given in mol/L per second)? a.-0.009, -0.018, 0.027 b.-0.018, -0.027, 0.018 c.-0.072, -0.048, 0.072 d.-0.036, -0.036, 0.036 5. Given the following mechanism, which species below may be classified as intermediates in the formation of XO 2 from X and O 2 ? X + YO 2 XO + YO XO + YO 2 XO 2 + YO YO + O 2 YO 2 + O YO + O YO 2 a. X only b. both X and YO 2 c. both XO and YO d. both YO 2 and O 2 6. Stilbene exists in two confirmations, cis-stilbene and trans-stilbene. For the reaction where cis becomes trans, K c is 24.0 at 200 C. Initially there is only 0.850 M cis-stilbene. ⁰ What is the equilibrium concentration of trans-stilbene? Cis-stilbene trans-stilbene a. 0.034 M b. 0.508 M c. 0.816 M d. 0.022 M 7. Given the following data for the NH 4 + + NO 2- N 2 + 2H 2 O reaction, the rate law for the reaction is Trial [NH 4 + ] [NO 2- ] Rate 1 0.010 M 0.020 M 0.020 M/s 2 0.015 M 0.020 M 0.030 M/s 3 0.010 M 0.010 M 0....
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- Spring '10
- Reaction, Chemical reaction, Rate equation