The following energy diagram is the reaction progress for the reaction: (CHg)3CCI + OH" → (CH3)3COH + cr at 45 °C. The energy diagram shows that the reaction mechanism has 2 steps. These 2 steps have the same orientation factors and same number of collisions per second. Which of the following statements concerning the mechanism is correct? 135 kJ- 115 kJ 90 kJ -25 kJ- (CH),CCI + OH reactants -60 kJ + (CH),COH + CF products reaction coordinate (progress of reaction) If a catalyst is added to the above reaction at 45 °C, the rate of the reaction will increase and the heat O a. (enthalpy) of the reaction will decrease for the forward reaction. b. In the mechanism of the above reaction, the activation energy of the first step is 135 k). O c.In the mechanism of the above reaction, the first step is most likely the rate determining step. d. The overall reaction of this reaction is endothermic. e. When the temperature is increased, the activation energy of both steps will decrease. Energy
The following energy diagram is the reaction progress for the reaction: (CHg)3CCI + OH" → (CH3)3COH + cr at 45 °C. The energy diagram shows that the reaction mechanism has 2 steps. These 2 steps have the same orientation factors and same number of collisions per second. Which of the following statements concerning the mechanism is correct? 135 kJ- 115 kJ 90 kJ -25 kJ- (CH),CCI + OH reactants -60 kJ + (CH),COH + CF products reaction coordinate (progress of reaction) If a catalyst is added to the above reaction at 45 °C, the rate of the reaction will increase and the heat O a. (enthalpy) of the reaction will decrease for the forward reaction. b. In the mechanism of the above reaction, the activation energy of the first step is 135 k). O c.In the mechanism of the above reaction, the first step is most likely the rate determining step. d. The overall reaction of this reaction is endothermic. e. When the temperature is increased, the activation energy of both steps will decrease. Energy
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Reaction Progress and Energy Diagram for (CH₃)₃CCl + OH⁻ → (CH₃)₃COH + Cl⁻ at 45°C**
The diagram presents the energy profile of a two-step reaction mechanism involving (CH₃)₃CCl and OH⁻, yielding (CH₃)₃COH and Cl⁻. Both steps in the mechanism exhibit identical orientation factors and collision numbers per second.
**Energy Diagram Explanation:**
- The y-axis represents energy, and the x-axis is the reaction coordinate, illustrating the progression of the reaction.
- The diagram begins at the energy level of the reactants, (CH₃)₃CCl and OH⁻.
- The first peak represents the transition state of the first step, with a peak energy of approximately 135 kJ.
- The curve descends to an intermediate point before reaching a second, smaller peak, indicating the transition state of the second step.
- Finally, the curve declines to a lower energy level, indicating the energies of the products, (CH₃)₃COH and Cl⁻.
**Question Analysis:**
Which statement regarding the mechanism is correct?
1. **a.** If a catalyst is added, the reaction rate increases, and the forward reaction's heat (enthalpy) decreases.
2. **b.** The activation energy of the first step is 135 kJ.
3. **c.** The first step is most likely the rate-determining step.
4. **d.** The reaction is endothermic overall.
5. **e.** Increasing the temperature decreases the activation energy for both steps.
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