What is the effect of adding a catalyst on
(a) Activation energy $(E_{a})$ , and
(b) Gibbs energy $(△ G)$ of a reaction?

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Solution

(a) On adding catalyst activation energy decreases if the added catalyst is positive catalyst and if the added catalyst is negative catalyst then the activation energy increases.

(b) Gibbs energy is a state function which depends only upon the initial and final states of the reaction hence, there will not be any effect on the presence of catalyst on Gibbs energy.

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Q. What is the effect of adding a catalyst on:
(a) Activation energy

(E_{a})

and
(b) Gibbs energy

(Δ G)

of a reaction?

Q. What is the effect of catalyst on:
(i) Gibbs energy

(Δ G)

(ii) activation energy of a reaction

Q. What is the effect of catalyst on (i) Gibbs energy and (ii) activation energy of reaction?

The role of a catalyst is to change ...... .
(a) Gibbs energy of reaction
(b) enthalpy of reaction
(c) activation energy of reaction
(d) equilibrium constant

Q. Arrhenius studied the effect of temperature on the rate of a reaction and postulated that rate constant varies with temperature exponentially as

k = A e^{- \frac{E_{a}}{R T}}

This method is generally used for finding the activation energy of a reaction. Keeping temperature constant, the effect of catalyst on the activation energy has also been studied.
If x is the fraction of molecules having energy greater than

E_{a}

it will be given by:

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What is the effect of adding a catalyst on(a) Activation energy (Ea), and(b) Gibbs energy (△G) of a reaction?

What is the effect of adding a catalyst on
(a) Activation energy $(E_{a})$ , and
(b) Gibbs energy $(△ G)$ of a reaction?