Engineering
Chemistry
Catalysis and Kinetics
Question
The enthalpy(H) of an elementary exothermic reaction A ⇌ B is schematically plotted against the reaction coordinate. The plots in the presence and absence of a catalyst are shown in dashed and solid lines, respectively. Identify the correct plot for the reaction.
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Solution
A catalyst provides an alternate pathway for a reaction to occur. The alternate pathway has a lower activation energy (Ea) meaning that the reactant molecules do not need to collide with as much energy in order for a reaction to occur. So more collision results in a reaction, so the reaction rate is faster.
Note that adding a catalyst does not change the amount of energy released (ΔH) for the reaction.
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