What effect would the addition of a catalyst to the reactants have on the values

Question

What effect would the addition of a catalyst to the reactants have on the values of the half-life, ths rate constant, k, and change in enthalpy,AH, for a first order reaction? 31. (A) The 1s.k and // would all be larger than that of the uncatalyzed reaction. (B) The and k would be smaller than that ofthe uncatalyzed reaction, and would be unchanged. would be unchanged. would be unchanged. (C) The would be larger than that of the uncatalyzed reaction, the k would be smaller, and H (D) Theta would be smaller than that ofthe uncatalyzed reaction, the k would be larger, and H

Explanation / Answer

Addition of catalyst in first order reaction increases the rate constant as catalyst provide an alternate pathway with minimum activation energy to complete the reaction as soon as possible.As the activation energy gets reduced then according to Arrhenius equation as given below:

k=A*exp(-E/R*T)

The rate constant thus increases as the activation energy gets reduced on addition of catalyst.

Now as the rate constant increases the half life decreases as in first order reaction t1/2=ln2/k .

At last addition of catalyst does not have any effect on enthalpy change as the enthalpy change is only the function of temperature.

Thus, the correct option is d

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