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Why do most chemical reaction rates incr...

Why do most chemical reaction rates increase rapidly as the temperature rise ?

A

The fraction of molecules with kinetic energy greater than the activation energy increases rapidly with temperature

B

The average kinetic energy increases as temperature rises

C

The activation energy decreases as temperature rises

D

More collisions take place between particles so that the reaction can occur

Text Solution

Verified by Experts

The correct Answer is:
A
As the temperature rises , the molecules gain more kinetic energy and more number of collisions takes place leading to speeding up of reaction i.e., increasing the rate of reaction .
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The rate of a chemical reaction generally increases rapidly even for small temperature increase because of a rapid increase in

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Knowledge Check

  • The rate of a chemical reaction generally increases rapidly even for small temperature rise because of rapid increases in the

    A
    Colliison frequency
    B
    Activation energy
    C
    Fraction of molecules with energies in exess of the activation energy
    D
    Avergae kinetic energy of the molecules

  • The rate of chemical reaction increases:

    A
    (a) If the temperature is increased
    B
    (b) If the concentration of the reactants is decreased
    C
    (c ) If the concentration of the reactants is increased
    D
    (d) With time

  • Statement: The rate of a chemical reaction increases as the temperature is increased. Explanation: The collision frequency between the reactant molecules increases on increasing the temperature.

    A
    (a) `S` is correct but `E` is wrong
    B
    (b) `S` is wrong but `E` is correct
    C
    (c ) Both `S` and `E` are correct and `E` is correct explanation of `S`
    D
    (d) Both `S` and `E` are correct but `E` is not correct explanation of `S`.

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    Statement-1 : Rate of a chemical reaction increases as the temperature is increased. Statement-2 : As the temperature is increased fraction of molecules occupying E_(T) or more increases.

    Rate of which reactions increases with temperature:

    Rate of which reactions increase with temperature ?

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