The terms order and molecularity are common in chemical kinetics.
(a) What do you mean by order and molecularity?
(b) (i) Write two factors influencing rate of a reaction.
(ii) Write Arrhenius equation.

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Solution

ORDER OF REACTION MOLECULARITY OF A REACTION
It is sum of the concentration term on which the rate of reaction actually depends or it is the sum of the exponents of the concentration in the rate law equation. iIt is the number of atoms,ions or molecules that must collode with ine 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 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 molecular of the reactants as seen from the unbalance equation For simple reactions, the molecularity can u sally be obtain from the Stoichiometry of the equation.
i) Factors that affects the reaction rates of chemical reactions is the concentration of reactants, temperature, the physical state of reactants and their dispersion, the solvent, and the presence of a catalyst.
ii) $K = A^{\frac{- E a}{R T}}$
Here K is rate constant
Ea is activation enertgy
R is gas constant
T is temparature in kelvin.

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ORDER OF REACTION	MOLECULARITY OF A REACTION
It is sum of the concentration term on which the rate of reaction actually depends or it is the sum of the exponents of the concentration in the rate law equation.	iIt is the number of atoms,ions or molecules that must collode with ine 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 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 molecular of the reactants as seen from the unbalance equation	For simple reactions, the molecularity can u sally be obtain from the Stoichiometry of the equation.