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Chemistry for Engineering Students
Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter11: Chemical Kinetics
Section: Chapter Questions
Problem 11.61PAE
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### Understanding Reaction Energy Diagrams and the Effect of Enzymes In this section, we will explore how enzymes impact reaction energy using a reaction energy diagram. #### Reaction Energy Diagram: **Graph Components:** - **Y-axis (Vertical):** Represents the energy of the reaction. - **X-axis (Horizontal):** Represents the course of the reaction. The diagram has two curves: - **Pink Curve:** Represents the reaction energy without the enzyme. - **Gray Curve:** Represents the reaction energy with the enzyme. **Key Points on the Diagram:** - **Starting Energy Level:** Both the enzyme-catalyzed reaction and the uncatalyzed reaction start at the same energy level. - **Peak Energy with Enzyme:** The energy peak is significantly lower for the gray curve (with enzyme), indicating reduced activation energy. - **Peak Energy without Enzyme:** The pink curve reaches a higher peak, showing higher activation energy without the enzyme. **Labels:** 1. **Activation Energy Without Enzyme:** - This is marked as the higher energy requirement indicated by the pink curve. The arrow indicating this should point from the starting level to the peak of the pink curve. 2. **Activation Energy With Enzyme:** - This is represented by the lower energy requirement along the gray curve. The arrow indicating this should point from the starting level to the peak of the gray curve. **Answer Bank:** - Activation energy without enzyme - Activation energy with enzyme Enzymes are biological catalysts that lower the activation energy required for a reaction to occur, thereby increasing the reaction rate. This concept is visually demonstrated by the difference in peak heights between the gray and pink curves on the reaction energy diagram.
Transcribed Image Text:### Understanding Reaction Energy Diagrams and the Effect of Enzymes In this section, we will explore how enzymes impact reaction energy using a reaction energy diagram. #### Reaction Energy Diagram: **Graph Components:** - **Y-axis (Vertical):** Represents the energy of the reaction. - **X-axis (Horizontal):** Represents the course of the reaction. The diagram has two curves: - **Pink Curve:** Represents the reaction energy without the enzyme. - **Gray Curve:** Represents the reaction energy with the enzyme. **Key Points on the Diagram:** - **Starting Energy Level:** Both the enzyme-catalyzed reaction and the uncatalyzed reaction start at the same energy level. - **Peak Energy with Enzyme:** The energy peak is significantly lower for the gray curve (with enzyme), indicating reduced activation energy. - **Peak Energy without Enzyme:** The pink curve reaches a higher peak, showing higher activation energy without the enzyme. **Labels:** 1. **Activation Energy Without Enzyme:** - This is marked as the higher energy requirement indicated by the pink curve. The arrow indicating this should point from the starting level to the peak of the pink curve. 2. **Activation Energy With Enzyme:** - This is represented by the lower energy requirement along the gray curve. The arrow indicating this should point from the starting level to the peak of the gray curve. **Answer Bank:** - Activation energy without enzyme - Activation energy with enzyme Enzymes are biological catalysts that lower the activation energy required for a reaction to occur, thereby increasing the reaction rate. This concept is visually demonstrated by the difference in peak heights between the gray and pink curves on the reaction energy diagram.
### Enzymes and Activation Energy **Overview:** Enzymes take part in nearly all metabolic reactions. An enzyme's role in biochemical reactions is crucial, particularly in terms of how it impacts the activation energy required for these reactions. This section will explore the effect of enzymes on activation energy. **Question:** How do enzymes affect the activation energy of a reaction? **Input:** \[ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \] **Reaction Energy Diagram:** Label the reaction energy diagram with the appropriate terms. **Effect of Enzymes:** *Diagram Explanation:* - The y-axis represents Energy. - Two curves are shown: - The **pink curve** represents the activation energy without an enzyme. - The **gray curve** represents the activation energy with an enzyme. - Labels should be applied to indicate: - "Activation energy without enzyme" for the higher peak. - "Activation energy with enzyme" for the lower peak. **Answer Bank:** - activation energy without enzyme - activation energy with enzyme **Diagram Labels:** - The higher energy peak should be labeled "activation energy without enzyme." - The lower energy peak should be labeled "activation energy with enzyme." By reducing the activation energy, enzymes allow reactions to proceed more quickly and efficiently. This is crucial in biological systems, where reactions need to occur at a pace that supports life.
Transcribed Image Text:### Enzymes and Activation Energy **Overview:** Enzymes take part in nearly all metabolic reactions. An enzyme's role in biochemical reactions is crucial, particularly in terms of how it impacts the activation energy required for these reactions. This section will explore the effect of enzymes on activation energy. **Question:** How do enzymes affect the activation energy of a reaction? **Input:** \[ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \] **Reaction Energy Diagram:** Label the reaction energy diagram with the appropriate terms. **Effect of Enzymes:** *Diagram Explanation:* - The y-axis represents Energy. - Two curves are shown: - The **pink curve** represents the activation energy without an enzyme. - The **gray curve** represents the activation energy with an enzyme. - Labels should be applied to indicate: - "Activation energy without enzyme" for the higher peak. - "Activation energy with enzyme" for the lower peak. **Answer Bank:** - activation energy without enzyme - activation energy with enzyme **Diagram Labels:** - The higher energy peak should be labeled "activation energy without enzyme." - The lower energy peak should be labeled "activation energy with enzyme." By reducing the activation energy, enzymes allow reactions to proceed more quickly and efficiently. This is crucial in biological systems, where reactions need to occur at a pace that supports life.
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