Multiple Choice
If a catalyst lowers the activation energy of a reaction, which of the following is most likely to occur?
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15. Chemical Kinetics
Catalyst
Multiple Choice
Which of the following best describes the role of a catalyst in the energetics of a chemical reaction?
A
A catalyst changes the overall enthalpy change (ΔH) of the reaction.
B
A catalyst lowers the activation energy, increasing the reaction rate without being consumed.
C
A catalyst increases the activation energy, making the reaction slower.
D
A catalyst is consumed during the reaction and alters the equilibrium position.
Verified step by step guidance1
Understand that a catalyst affects the energy profile of a chemical reaction by providing an alternative reaction pathway.
Recall that the activation energy (E_a) is the minimum energy required for reactants to transform into products.
Recognize that a catalyst lowers the activation energy, which increases the rate at which the reaction proceeds.
Note that the catalyst does not change the overall enthalpy change (\$\(\Delta\) H\$) of the reaction, meaning the energy difference between reactants and products remains the same.
Remember that a catalyst is not consumed in the reaction and does not alter the equilibrium position; it only helps the system reach equilibrium faster.
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