In a reversible reaction, the equilibrium constant Kc changes only when there is a change in
Correct answer: C. temperature
- A. concentration of the reactants
- B. pressure of the system
- C. temperature
- D. the catalyst used
Explanation
Concentration and pressure changes shift the position of equilibrium so that the same value of Kc is restored, and a catalyst affects only the rate, so none of them alters the constant. Temperature is different because it changes the relative rates of the forward and reverse reactions unequally, giving a genuinely new value of Kc. For an exothermic reaction Kc falls as the temperature rises.
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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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