Multiple Choice
Which term best describes a substance that increases the rate of a chemical reaction without being consumed or permanently altered in the process?
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15. Chemical Kinetics
Catalyst
Multiple Choice
Which of the following statements about catalysts is correct?
A
A catalyst lowers the activation energy of a reaction.
B
A catalyst changes the products of a chemical reaction.
C
A catalyst is consumed during the reaction.
D
A catalyst increases the equilibrium constant of a reaction.
Verified step by step guidance1
Understand the role of a catalyst in a chemical reaction: A catalyst provides an alternative reaction pathway with a lower activation energy, which increases the reaction rate without being consumed.
Recall that a catalyst does not change the reactants or products; it only affects how quickly equilibrium is reached.
Recognize that a catalyst is not consumed in the reaction, meaning it can be used repeatedly.
Know that a catalyst does not affect the position of equilibrium or the equilibrium constant; it only helps the system reach equilibrium faster.
Based on these points, identify that the correct statement is: 'A catalyst lowers the activation energy of a reaction.'
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