Consider this energy diagram:
a. How many elementary steps are involved in this reaction?

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Identify the number of peaks in the energy diagram. Each peak represents a transition state, which corresponds to an elementary step.

Count the number of valleys or intermediates between the peaks. These valleys represent the intermediates formed during the reaction.

The number of elementary steps is equal to the number of peaks in the energy diagram.

Verify that each peak corresponds to a distinct transition state, indicating a separate elementary step.

Summarize the total number of elementary steps based on the number of peaks identified in the energy diagram.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Elementary Steps

Elementary steps are the individual reactions that occur in a multi-step chemical reaction. Each step represents a single molecular event, such as the collision of reactants leading to products. Understanding the number of elementary steps is crucial for analyzing reaction mechanisms and determining the overall rate of the reaction.

Energy Diagram

An energy diagram visually represents the energy changes that occur during a chemical reaction. It typically shows the energy of reactants, products, and the transition states, indicating the activation energy required for the reaction to proceed. By examining the diagram, one can identify the number of steps and the energy barriers involved in the reaction.

Reaction Mechanism

A reaction mechanism is a detailed description of the step-by-step process by which reactants are converted into products. It includes the sequence of elementary steps, intermediates formed, and the transition states. Understanding the mechanism is essential for predicting reaction rates and the influence of various factors on the reaction.