A Level Chemistry OCR Practice Exam

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What is the significance of the limiting reagent concept in a chemical reaction?

It indicates the maximum possible yield of products
It determines the temperature at which the reaction occurs
It helps in establishing reaction kinetics
It indicates the reactant that is completely consumed first

The correct answer is: It indicates the reactant that is completely consumed first

The significance of the limiting reagent concept in a chemical reaction lies in its role in identifying the reactant that is completely consumed first during the reaction. This is crucial because the limiting reagent dictates the maximum amount of product that can be formed. Once the limiting reagent is used up, the reaction cannot proceed any further, even if other reactants are still available. Understanding the limiting reagent helps chemists calculate the theoretical yield of products, as it provides insight into how much of each reactant is available and how they will react together. In practical applications, this concept is essential for optimizing reactions, minimizing waste, and ensuring that resources are used efficiently. Recognizing the limiting reagent also aids in understanding the stoichiometry of the reaction, which is vital for laboratory preparations and large-scale industrial processes.