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The numerical value of the equilibrium c...

The numerical value of the equilibrium constant or any chemical change is affected by changing the

A

concentration of product

B

catalyst

C

concentration of reacting substance

D

temperature

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To solve the question regarding the factors that affect the numerical value of the equilibrium constant (K) for a chemical change, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Equilibrium Constant (K)**: The equilibrium constant (K) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given reaction at a specific temperature. 2. **Identifying Factors Affecting K**: The equilibrium constant is influenced by several factors, but it is crucial to note that K is primarily affected by temperature. Other factors such as concentration of reactants/products and the presence of catalysts do not change the value of K. 3. **Applying Le Chatelier's Principle**: According to Le Chatelier's Principle, if a system at equilibrium is subjected to a change in concentration, pressure, or temperature, the system will adjust to counteract that change. However, this principle indicates that while the position of equilibrium may shift, the value of K remains constant unless the temperature changes. 4. **Effect of Temperature on K**: - **Endothermic Reactions**: For reactions that absorb heat (endothermic), increasing the temperature shifts the equilibrium to the right (towards products), thus increasing K. - **Exothermic Reactions**: For reactions that release heat (exothermic), increasing the temperature shifts the equilibrium to the left (towards reactants), thus decreasing K. 5. **Conclusion**: The numerical value of the equilibrium constant (K) for any chemical change is affected only by changes in temperature. Changes in concentration of reactants or products, or the addition of catalysts, do not affect the value of K. ### Final Answer: The numerical value of the equilibrium constant (K) is affected only by changing the temperature. ---
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