Chemical equilibrium is attained more rapidly upon the introduction of ________________?
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Answer: D. catalyst
Explanation
A catalyst lowers the activation energy of both forward and reverse reactions, allowing chemical equilibrium to be attained more rapidly without altering the position of equilibrium. By providing an alternative pathway with a lower energy barrier, reactant molecules convert to products much faster. Thermodynamic equilibrium concentrations remain unchanged because the catalyst speeds up forward and reverse rates equally. Catalysts participate temporarily in reaction mechanisms but are regenerated completely by the end of the process. Equilibrium is a state where forward and reverse reaction rates become equal in a closed system. Adding a catalyst saves industrial time and energy by reducing the temperature required to reach useful yields.
Adding more reactants shifts equilibrium position via Le Chatelier's principle rather than simply accelerating the rate of attainment. Acids can catalyze specific reactions, but they do not universally speed up the attainment of all chemical equilibria. Bases act as specific catalysts for certain organic mechanisms rather than being the general agent for all equilibria.
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