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CBSE Class 12 Chemistry Notes: Chemical Kinetics – Arrhenius Equations

by Anand Meena
April 22, 2019
in 12th Class, Class Notes
Reading Time: 2min read
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The effect of temperature on rate is given by Arrhenius law
k = A.e–E/RT            K = rate constant

    E = Activation energy

    R = Gas constant

    T = Absolute Temp.

    A = Frequency factor (Arrhenius Constant)

Taking log an both order
Arrhenius Equations Arrhenius Equations

On comparing with the equation of line

From the above equation it is clear that when T → ∞ then k becomes A.
i.e. Arrhenius constant is that value of rate constant at infinite temperatures.
Now on comparing Arrhenius equation with equation of straight line we have

Arrhenius Equations

Pre exponential factor

The effect of temperature on rate of reaction at two different temperature T1& T2 can be calculated by the Arrhenius law.

Class 12 Chemistry Notes Chemical Kinetics - Arrhenius Equations

Surface Area of Reactants:

In Solid reactions, surface area plays an important role. Larger surface area provides more active sites for reaction hence increase the rate of reaction whereas small surface areas decrease the rate of reaction.

Fine particle         – Large surface area
     Big size particle   – Small surface area

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Class 12 Chemistry Chemical Kinetics All Topics Notes CBSE Class 12 Chemistry All Chapters Notes

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Tags: 12 Chemistry12 Class ChemistryCBSE NotesChemistry for Class 12Class 12 NotesClass 12thClass XII ChemistryFree NotesXII Class

Anand Meena

Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics.

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