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How does a catalyst affect a chemical reaction?
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15. Chemical Kinetics
Catalyst
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How does a catalyst increase the rate of a chemical reaction?
A
It increases the temperature of the reactants.
B
It changes the equilibrium position of the reaction.
C
It lowers the activation energy required for the reaction to occur.
D
It increases the concentration of the products.
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Understand that the rate of a chemical reaction depends on the activation energy, which is the minimum energy required for reactants to transform into products.
Recognize that a catalyst provides an alternative reaction pathway with a lower activation energy, making it easier for reactants to convert into products.
Note that by lowering the activation energy, a catalyst increases the number of effective collisions per unit time, thus increasing the reaction rate.
Remember that a catalyst does not change the temperature of the reactants; temperature is an external condition that can affect reaction rate but is not altered by the catalyst itself.
Also, a catalyst does not change the equilibrium position or the concentrations of reactants or products; it only helps the system reach equilibrium faster.
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