How does the rate of a reaction change after a catalyst is added?A.The rate increases.B.The rate becomes zero.C.The rate decreases.D.The rate remains the same.

Understanding the Impact of Catalysts on Reaction Rates

When a catalyst is added to a reaction, it provides an alternative pathway for the reaction to occur with a lower activation energy. This means that more reactant molecules have enough energy to collide and react, effectively increasing the frequency of successful collisions leading to product formation.

Answer Analysis

1. Rate of Reaction: The rate of a chemical reaction is a measure of how quickly reactants are converted into products.
2. Role of Catalysts: Catalysts do not change the overall energy of the reactants and products; they merely alter the pathway of the reaction.
3. Effect of Catalysts on Rate: By lowering the activation energy, catalysts help the reaction proceed faster.

Conclusion

Considering these factors, the correct answer to the question regarding the effect of a catalyst on the rate of a reaction is:

A. The rate increases.

Adding a catalyst will enhance the rate of the reaction by making it easier for reactants to convert to products.