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
What occurs when a catalyst is added to a chemical reaction?
A
The activation energy of the reaction decreases, increasing the reaction rate.
B
The reaction enthalpy changes, making the reaction more exothermic.
C
The catalyst is consumed and becomes part of the final products.
D
The equilibrium position of the reaction shifts toward the products.
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.
Recall that activation energy (\[E_a\]) is the minimum energy required for reactants to transform into products; lowering \[E_a\] increases the reaction rate.
Recognize that a catalyst is not consumed in the reaction; it participates temporarily and is regenerated by the end of the reaction.
Know that a catalyst does not change the overall enthalpy change (\[\Delta H\]) of the reaction; the energy difference between reactants and products remains the same.
Understand that a catalyst does not shift the equilibrium position; it only helps the system reach equilibrium faster by speeding up both the forward and reverse reactions.
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