Multiple Choice
Which term describes a substance that increases the rate of a chemical reaction without being consumed in the process?
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15. Chemical Kinetics
Catalyst
Multiple Choice
Which phrase best describes the effect of a catalyst on a chemical reaction?
A
It increases the activation energy, slowing down the reaction.
B
It is consumed during the reaction and forms new products.
C
It changes the equilibrium position of the reaction.
D
It lowers the activation energy, increasing the reaction rate without being consumed.
Verified step by step guidance1
Understand that a catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.
Recall that the activation energy (\[E_a\]) is the minimum energy required for reactants to transform into products during a reaction.
Recognize that a catalyst works by providing an alternative reaction pathway with a lower activation energy, which makes it easier for reactants to convert into products.
Note that because the catalyst is not consumed, it can be used repeatedly and does not change the overall equilibrium position of the reaction.
Conclude that the best description of a catalyst's effect is that it lowers the activation energy, thereby increasing the reaction rate without being consumed.
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