Answered: 2. For the reaction we studied: 21 +…

Chemistry

10th Edition

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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$### Transcription: 2. For the reaction we studied: \[ 2 \text{I}^- + \text{S}_2\text{O}_8^{2-} \rightarrow \text{I}_2 + 2 \text{SO}_4^{2-} \] \[ \Delta E_{\text{rxn}} \approx \Delta H_{\text{rxn}} = -322 \text{ kJ} \] **A.** Use this value and your experimental activation energy value to draw an **energy profile** for the reaction with the energies appropriately scaled on the vertical axis. **B.** Label $\Delta E_{\text{rxn}} (\Delta H_{\text{rxn}})$ and $E_a$ on the graph. **C.** Calculate the $E_a$ for the reverse reaction. ### Diagram Explanation: The diagram on the right is a graph representing an energy profile of a chemical reaction. The vertical axis is labeled as "E," representing energy, and the horizontal axis is labeled "Reaction progress," indicating how the reaction progresses over time. In such a graph: - The starting point on the vertical axis represents the energy level of the reactants. - The peak of the curve represents the transition state, which corresponds to the activation energy ($E_a$). - The final point represents the energy level of the products. - The difference in energy between the reactants and products ($\Delta E_{\text{rxn}}$ or $\Delta H_{\text{rxn}}$) is shown as the net energy change of the reaction.$

Transcribed Image Text:### Transcription: 2. For the reaction we studied: \[ 2 \text{I}^- + \text{S}_2\text{O}_8^{2-} \rightarrow \text{I}_2 + 2 \text{SO}_4^{2-} \] \[ \Delta E_{\text{rxn}} \approx \Delta H_{\text{rxn}} = -322 \text{ kJ} \] **A.** Use this value and your experimental activation energy value to draw an **energy profile** for the reaction with the energies appropriately scaled on the vertical axis. **B.** Label $\Delta E_{\text{rxn}} (\Delta H_{\text{rxn}})$ and $E_a$ on the graph. **C.** Calculate the $E_a$ for the reverse reaction. ### Diagram Explanation: The diagram on the right is a graph representing an energy profile of a chemical reaction. The vertical axis is labeled as "E," representing energy, and the horizontal axis is labeled "Reaction progress," indicating how the reaction progresses over time. In such a graph: - The starting point on the vertical axis represents the energy level of the reactants. - The peak of the curve represents the transition state, which corresponds to the activation energy ($E_a$). - The final point represents the energy level of the products. - The difference in energy between the reactants and products ($\Delta E_{\text{rxn}}$ or $\Delta H_{\text{rxn}}$) is shown as the net energy change of the reaction.

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