Equilibrium state is achieved quickly by the addition of ________________?
Correct answer: D. catalyst
- A. reactants
- B. acid
- C. base
- D. catalyst
Explanation
A catalyst lowers the activation energy of both the forward and reverse reactions, increasing both rates and allowing equilibrium to be reached sooner. It does not change the equilibrium constant or the final equilibrium composition. Students may choose a reactant, acid, or base because these can affect a particular reaction, but they do not generally provide the defining equilibrium-speed effect of a catalyst.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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