Briefly comment on the effect of a catalyst on each of the following. (a) activation energy A
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(a) activation energy
A catalyst lowers the activation energy by changing the reaction mechanism.
A catalyst lowers the activation energy by changing the rate.
A catalyst raises the activation energy by changing the reaction mechanism.
A catalyst does not change the activation energy.
A catalyst raises the activation energy by changing the rate.
(b) reaction mechanism
A catalyst always simplifies a reaction mechanism.
A catalyst does not change the reaction mechanism.
A catalyst always makes a reaction mechanism more complicated.
A catalyst changes the reaction mechanism.
(c) enthalpy of reaction
A catalyst always raises the enthalpy of reaction.
A catalyst does not change the enthalpy of reaction.
A catalyst always lowers the enthalpy of reaction.
A catalyst changes the enthalpy of reaction, either raising or lowering it.
(d) rate of forward step
A catalyst decreases the rate of the forward reaction.
A catalyst does not change the rate of the forward reaction.
A catalyst increases the rate of the forward reaction.
(e) rate of reverse step
A catalyst does not change the rate of the reverse reaction.
A catalyst decreases the rate of the reverse reaction.
A catalyst increases the rate of the reverse reaction.
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Authors: Jacqueline Birt, Keryn Chalmers, Albie Brooks, Suzanne Byrne, Judy Oliver
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