Which of the following is not characteristics of reversible reaction__________________?
Correct answer: C. a catalyst changes the direction of reaction
- A. whole amount of reactant does not change into product
- B. chemical equilibrium is established
- C. a catalyst changes the direction of reaction
- D. rate of forward reaction decreases as reaction proceeds
Explanation
A catalyst does not change the direction or position of equilibrium; it lowers the activation energy for both forward and reverse reactions equally. Therefore, saying that a catalyst changes the direction of a reversible reaction is incorrect. Students may choose option d by confusing the decreasing forward rate with an absence of reverse reaction, but the forward rate normally decreases as reactants are consumed.
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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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