Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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### Chemical Reaction Pathways of Compounds #### Reactions Involving Compounds A and B Suppose a pair of chemical compounds \( A \) and \( B \) can react in two different ways: 1. \( A + B \rightarrow C \): Reaction 1 gives product \( C \). 2. \( A + B \rightarrow D \): Reaction 2 gives product \( D \). #### Known Facts about the Reactions: - Both reactions are endothermic, but the heat of reaction of Reaction 2 is larger. - If a reaction vessel is charged (“filled”) with \( A \) and \( B \), then at first \( C \) is produced faster than \( D \). #### Qualitative Reaction Energy Diagrams: Use these facts to sketch a qualitative reaction energy diagram for both reactions. Note: because these sketches are only qualitative, the energies don't have to be exact. They only have to have the right relationship to each other. For example, if one energy is less than another, that fact should be clear in your sketch. ##### Graph Explanation: **Reaction Diagrams:** **1. Reaction 1** - **Y-axis (Energy):** Represents the energy level. - **X-axis (Reaction Coordinate):** Represents the progress of the reaction. - **Graph Characteristics:** The graph shows reactants \( A + B \) at a lower energy level. As the reaction proceeds, energy increases, reaching a peak, then drops slightly but ends at a higher energy level compared to the reactants, indicating an endothermic reaction. **2. Reaction 2** - **Y-axis (Energy):** Represents the energy level. - **X-axis (Reaction Coordinate):** Represents the progress of the reaction. - **Graph Characteristics:** Similar to Reaction 1, the graph shows reactants \( A + B \) at a lower energy level. As the reaction proceeds, the energy increases to a higher peak compared to Reaction 1, with a subsequent slight drop but ends at an even higher energy level, indicating a more endothermic reaction. ``` Reaction 1 Reaction 2 energy energy │ │ │ ___C │ ___D │ / │ / │ / │ / │ ___A + B / │ ___A + B / │ / / │ /
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Transcribed Image Text:### Chemical Reaction Pathways of Compounds #### Reactions Involving Compounds A and B Suppose a pair of chemical compounds \( A \) and \( B \) can react in two different ways: 1. \( A + B \rightarrow C \): Reaction 1 gives product \( C \). 2. \( A + B \rightarrow D \): Reaction 2 gives product \( D \). #### Known Facts about the Reactions: - Both reactions are endothermic, but the heat of reaction of Reaction 2 is larger. - If a reaction vessel is charged (“filled”) with \( A \) and \( B \), then at first \( C \) is produced faster than \( D \). #### Qualitative Reaction Energy Diagrams: Use these facts to sketch a qualitative reaction energy diagram for both reactions. Note: because these sketches are only qualitative, the energies don't have to be exact. They only have to have the right relationship to each other. For example, if one energy is less than another, that fact should be clear in your sketch. ##### Graph Explanation: **Reaction Diagrams:** **1. Reaction 1** - **Y-axis (Energy):** Represents the energy level. - **X-axis (Reaction Coordinate):** Represents the progress of the reaction. - **Graph Characteristics:** The graph shows reactants \( A + B \) at a lower energy level. As the reaction proceeds, energy increases, reaching a peak, then drops slightly but ends at a higher energy level compared to the reactants, indicating an endothermic reaction. **2. Reaction 2** - **Y-axis (Energy):** Represents the energy level. - **X-axis (Reaction Coordinate):** Represents the progress of the reaction. - **Graph Characteristics:** Similar to Reaction 1, the graph shows reactants \( A + B \) at a lower energy level. As the reaction proceeds, the energy increases to a higher peak compared to Reaction 1, with a subsequent slight drop but ends at an even higher energy level, indicating a more endothermic reaction. ``` Reaction 1 Reaction 2 energy energy │ │ │ ___C │ ___D │ / │ / │ / │ / │ ___A + B / │ ___A + B / │ / / │ /
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