When the number of moles of reactants and products are equal in reversible reactions which parameter would not affect at equilibrium?
Correct answer: D. Catalyst
- A. Temperature
- B. Pressure
- C. Volume
- D. Catalyst
Explanation
The addition of catalysts does not alter the equilibrium. Catalysts only help in achieving the equilibrium quicker. Option B and C would be correct only if all the products and reactants were gases, however the question does not specify that, hence option D is the best to choose. For change in temperature, the equilibrium remains in its new position, favoring the endothermic reaction if the surrounding temperature is high or favoring the exothermic reaction if the surrounding temperature is low.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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