The addition of a catalyst to the reaction system__________________?
Correct answer: D. Increases the rate of forward as well as backward reaction equally
- A. Increases the rate of forward reaction only
- B. Increases the rate of reverse reaction
- C. Increases the rate of forward but decreases the rate of backward reaction
- D. Increases the rate of forward as well as backward reaction equally
Explanation
A catalyst provides an alternative pathway with lower activation energy for both the forward and reverse reactions. Therefore, it increases both reaction rates, while the equilibrium position remains unchanged. Students commonly choose a by forgetting that a reversible reaction has a catalysed reverse pathway as well.
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About Activation Energy and Activated Complex
Activation energy is the minimum energy reactant particles need to form the activated complex, or transition state, during a reaction. Energy profile diagrams show the forward and reverse activation energies, while catalysts provide an alternative pathway with lower activation energy without changing the reaction enthalpy.
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