Chemical Kinetics,rate law,rate constant,order,elementaryandcomplex,molecularity,rate constantsof app. and dissap.
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Course
Chemistry
Institution
In this notes, you will get the detailed knowledge of Chemical kinetics topics including rate law, rate constant, order, elementary/simple reaction, complex reaction, molecularity, rate constant of appearance and disappearance. This is well structured manually typed notes made for our students. You...
Study guide, Definitions & Notes
Topics Covered:
• Rate Law
• Rate Constant
• Order
• Elementary/Simple Reaction
• Complex Reaction
• Molecularity
• Rate constants of Appearance and Disappearance
Rate Law
For a reaction at a constant temperature,
aA + bB Products
According to rate law,
𝑦
(Rate)t ∝ [𝐴]𝑡𝑥 [𝐵]𝑡
Rate = K. [A]x [B]y → Differential rate law expression
Where, K = Rate constant/ velocity constant or specific rate
Also, x → Order with respect to A
Y → Order with respect to B
Here, x and y are partial orders
And (x + y) → Overall order of reaction (n)
Since orders are determined only experimentally so rate law cannot be written
without experimental data.
Rate Constant (K)
• For a reaction, K is the measure of rate.
• More value of K → More rate
• For a particular reaction, k depends upon temperature and catalyst only.
• Units if K depend upon the overall order of reaction (n).
For A Product
Rate = K[A] n
𝑀
( ) = K (M)n
𝑡𝑖𝑚𝑒
= K → M(1 – n) time-1
i.e., Zero order = n = 0 = K → M. time-1
First order = n = 1 = K → time-1
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