Question:

The addition of a catalyst during a chemical reaction alters which of the following quantities of the reaction?

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A catalyst speeds up a reaction by decreasing activation energy, but it does not affect the thermodynamic properties of the reaction.
Updated On: Feb 25, 2025
  • Enthalpy
  • Activation energy
  • Entropy
  • Internal energy
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The Correct Option is B

Solution and Explanation

A catalyst functions by providing an alternative reaction pathway that has a lower activation energy (E\(_a\)), thereby increasing the reaction rate. - Catalysts do not alter: - Enthalpy (\(\Delta H\)): Since the reactants and products remain the same. - Internal energy (\(U\)): The total energy of the system is unchanged. - Entropy (\(\Delta S\)): The disorder of the system remains unaffected. Thus, a catalyst only lowers the activation energy, making it easier for reactants to reach the transition state.
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