Question

why different reactions have different rate constants ?​

Answer 1

Answer:

RATE OF REACTION

Rate of reaction in the change in concentration of a reactant or product in a unit interval of time.

The rate of reaction at any instant of time depends upon the molar concentration of the reactants at that time.

Its units are always mol litre⁻¹ time⁻¹

REACTION RATE CONSTANT

It is the rate of reaction when the molar concentration of each of the reactants is unity.

The rate constant does not depend upon the concentration of the reactants.

Its units depend upon the order of reaction.

Explanation:

Answer 2

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In chemical kinetics a reaction rate constant or reaction rate coefficient, k, quantifies the rate of a chemical reaction.[1]

For a reaction between reactants A and B to form product C

a A + b B → c C

Here k(T) is the reaction rate constant that depends on temperature, and [A] and [B] are the molar concentrations of substances A and B in moles per unit volume of solution, assuming the reaction is taking place throughout the volume of the solution. (For a reaction taking place at a boundary one would use instead moles of A or B per unit area.)

The exponents m and n are called partial orders of reaction and are not generally equal to the stoichiometric coefficients a and b. Instead they depend on the reaction mechanism and can be determined experimentally.

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