Distinguish Between
Distinguish between : Order and Molecularity of reaction
Distinguish between molecularity and order of reaction.
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Solution 1
ORDER OF A REACTION | MOLECULARITY OF A REACTION |
It is sum of the concentration terms on which the rate of reaction actually depends or it is the sum of the exponents of the concentrations in the rate law equation. | It is the number of atoms, ions or molecules that must collide with one another simultaneously so as to result into a chemical reaction. |
It need not be a whole number i.e. it can be fractional as well as zero. | It is always a whole number. |
It can be determined experimentally only and cannot be calculated. | It can be calculated by simply adding the molecules of the slowest step. |
It is for the overall reaction and no separate steps are written to obtain it. | The overall molecularity of a complex reaction has no significance. It is the only slowest step whose molecularity has significance for the overall reaction. |
Even the order of a simple reaction may not be equal to the number of molecules of the reactants as seen from the unbalanced equation. | For simple reactions, the molecularity can usually be obtained from the Stoichiometry of the equation. |
It may be an integer, fraction or zero | It is always an integer and never a fraction or zero. |
Solution 2
Order of reaction | Molecularity | |
1. | It is an experimentally determined property. | It is a theoretical entity. |
2. | It is the sum of powers of the concentration terms of reactants that appear in the rate equation. | It is the number of reactant molecules taking part in an elementary reaction. |
3. | It may be an integer, fraction or zero. | It is integer. |
4. | It is not based on a balanced chemical equation. | It is based on a balanced chemical equation. |
Concept: Temperature Dependence of Reaction Rates
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