A catalyst increases the rate of reaction by:
Correct answer: C. Providing an alternative reaction pathway with a lower activation energy.
- A. Increasing the reaction temperature.
- B. Increasing the concentration of reactants.
- C. Providing an alternative reaction pathway with a lower activation energy.
- D. Shifting the equilibrium towards the products.
Explanation
A catalyst speeds up a reaction without being consumed by providing a different mechanism or pathway for the reaction to follow. This alternative pathway has a lower activation energy, which allows a greater fraction of reactant molecules to react per unit of time.
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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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