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326
(2)
(3)
(4)
(5)
Each step in a complex reaction is called as elementary reaction.
This implies that a complex reaction is broken down in a series of elementary reactions.
The overall reaction is obtained by adding all the elementary steps in a reaction.
The sequence of elementary reactions in a complex reaction help to determine the
mechanism of a chemical reaction.
(6) The concept of molecularity is applicable only for an elementary reaction.
(c) Example :
O 3 (g) ⎯⎯
→ O 2 (g) + O(g)
The above reaction is a single step elementary reaction.
*10.
Ans.
What do you mean by a complex reaction?
(a) Definition : A reaction that follows a simple rate law but occurs in a series of steps
is termed as a complex reaction.
(b) Explanation :
(1) A complex reaction occurs in multiple steps.
(2) Each step in a complex reaction is an elementary reaction.
(3) The overall reaction is obtained by adding all the elementary steps in a reaction.
(4) The sequence of elementary reactions in a complex reaction help to determine the
mechanism of a chemical reaction.
(5) Molecularity of a complex reaction has no meaning.
(c) Example : Refer 5.2 (f).
*11.
Ans.
Explain the terms rate determining step.
(a) The slowest step in the reaction mechanism is called a rate determining step.
(b) Explanation :
(1) A complex reaction occurs in multiple steps.
(2) Each step in a complex reaction is an elementary reaction.
(3) The sequence of elementary reactions in a complex reaction help to determine the
mechanism of a chemical reaction.
(4) One of the steps is the slowest step compared to other steps. Such a step is called
rate determining step.
(5) The rate of the overall reaction depends on the rate determining step.
(6) The overall reaction can never occur faster than its rate determining step.
(7) The rate determining step can occur anywhere in the reaction mechanism.
(8) The rate law of a rate determining step can be obtained from its stoichiometric equation.
Example : Refer 5.2 (g).
*12.
Ans.
Explain the term reaction intermediate.
Refer 5.2 (h).
Unique Solutions ®
S.Y.J.C. Science - Chemistry - Part I
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