Distinguish between : Order and Molecularity of reaction
Distinguish between molecularity and order of reaction.
|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.
|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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