A catalyst increases the rate of a reaction by
Correct answer: C. providing an alternative pathway with a lower activation energy
- A. increasing the kinetic energy of the reacting molecules
- B. raising the temperature of the reaction mixture
- C. providing an alternative pathway with a lower activation energy
- D. increasing the concentration of the reactants
Explanation
By offering a route with a smaller energy barrier, a catalyst allows a far larger proportion of collisions to be effective at the same temperature. It is recovered chemically unchanged at the end and it speeds the forward and reverse reactions equally, so the equilibrium position is untouched. A catalyst neither supplies energy nor alters concentration.
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About Factors Affecting Rate of Reaction
Reaction rate depends on the nature and concentration of reactants, pressure for gases, temperature, surface area and catalysts. Collision theory explains these effects through collision frequency, orientation and activation energy, while questions often distinguish a catalyst's effect on reaction rate from its lack of effect on equilibrium composition.
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