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How is the reaction rate influenced by energy of activation ?

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What are threshold energy and energy of activation ?

With 100 kJ mol- activation energy for an uncatalysed reaction at 20°C, the catalyst lowers the energy of activation by 75%. What will be the effective rate if other conditions are same?

Knowledge Check

  • Basal Metabolic Rate is influenced by

    A
    GH
    B
    Glucagon
    C
    thyroxine
    D
    ADH

  • A certain endothermic reaction: Ato Product, DeltaH=+ve proceeds ina sequence of three elementary steps with the rate constant K_(1),K_(2) and K_(3) and each one having energy of activation E_(1),E_(2) and E_(3) respectively at 25^(@)C . The observed rate constannt for the reaction is equal to K_(3)sqrt((K_(1))/(K_(2))) . A_(1),A_(2) and A_(3) are Arrhenius parameters respectively. Presence of a catalyst decreasesthe energy of activation of each path by half the value of E_(1) . Assuming the other factors same, the observed energy of activation would be

    A
    `E_(3)-(E_(2))/2`
    B
    `2E_(3)-E_(2)`
    C
    `E_(2)-(E_(3))/2`
    D
    `(E_(1))/2+(E_(2))/2+E_(3)`

  • A: Lesser the activation energy, greater is the rate of reaction R: Activation energy of a reaction is independent of temperature

    A
    Both A and B are true and R is the correct explanation of A
    B
    Both A and R are true and R is not the correct explanation of A
    C
    A is true but R is false
    D
    A is false but R is true

    • Similar Questions

    Explore conceptually related problems

    Explain the factors influencing rate of reaction.

    At 25^(0)C the activation energy for a catalysed reaction is 162 kJmol^(-1) and for uncatalysed reaction is 350 kJ mol^(-1) . How many times the rate is increased in the presence of catalyst ?

    (A) Lesser the activation energy, greater is the rate of reaction (R ) Activation energy of a reaction is independent of temperature

    A certain endothermic reaction: Ato Product, DeltaH=+ve proceeds ina sequence of three elementary steps with the rate constant K_(1),K_(2) and K_(3) and each one having energy of activation E_(1),E_(2) and E_(3) respectively at 25^(@)C . The observed rate constannt for the reaction is equal to K_(3)sqrt((K_(1))/(K_(2))) . A_(1),A_(2) and A_(3) are Arrhenius parameters respectively. The observed energy of activation for the reaction is

    (A)Catalyst increases the rate of reaction. (R ) Catalyst functions by lowering the energy of activation.

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