I dont undersrand 3 a-d please help ! Thank you ..how a catalyst increases the r
ID: 889636 • Letter: I
Question
I dont undersrand 3 a-d please help ! Thank you ..how a catalyst increases the reaction rate. Compared to how an increase in the temperature increases the reaction rate. why the addition of a catalyst to a reaction mixture can have such a pronounced effect on the rate of reaction, even if the temperature is held constant ..if a catalyst affects both the rate and the rate constant of ai reaction. ..why the order of a reaction is independent of temperature but the value of the rate constant varies with temperature.Explanation / Answer
a) A catalyst increases the rate of reaction by reducing the activation energy barrier by forming new intermediates. On the otherhand, increase in temperature supplies the rewuired activation energy for the reaction by molecular collission, hence increasing the rate of reaction.
b) Even if the temperature is constant, a catalyst reduces the activation barrier. Or in simple words, it splits the large activation energy required for a reaction by splitting into small steps by formation of interemediates with reactant moleculaes. Hence, a minimal energy supply can drive the rate of reaction forward with high rate even if the temperature is kept constant.
c) A catalyst enhances the rate of reaction. It may or may not increase the rate constant for the overall reaction as the overall reaction is now divided into a group of reaction due to formation of intermediates.
d) Rate constant increases with temperature and the expression is given by Arrhenious equation. This is because with increase in temperature supplied, the kinetic energy of reactant molecules increases and they started to collide with each other providing energy for the reaction in forms of collision. But, on the otherhand the order of a reaction, first of all, is an experimental quantity and is not affected by change in temperature of the reaction.
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