Question

define rate constant .​

Answer 1

Explanation:

The rate constant, or the specific rate constant, is the proportionality constant in the equation that expresses the relationship between the rate of a chemical reaction and the concentrations of the reacting substances.

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Answer 2

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• define rate constant

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• a coefficient of proportionality relating the rate of a chemical reaction at a given temperature to the concentration of reactant (in a unimolecular reaction) or to the product of the concentrations of reactants.

• The rate constant, or the specific rate constant, is the proportionality constant in the equation that expresses the relationship between the rate of a chemical reaction and the concentrations of the reacting substances.

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$r=k (T)[A] ^m[B]^n$

• r = reaction rate

• k(T) = reaction rate constant that depends on temperature

• [A] = molar concentrations of substances A in moles per unit volume of solution

• [B] = molar concentrations of substances B in moles per unit volume of solution

• m,n = partial orders of reaction

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∆ What Is Rate Constant?

• The rate constant is defined as the proportionality constant which explains the relationship between the molar concentration of the reactants and the rate of a chemical reaction.

• The rate constant is denoted by k and is also known as reaction rate constant or reaction rate coefficient. It is dependent on the temperature.

• There are two possible ways to calculate rate constant and they are:

1. Using the Arrhenius equation.
2. Using the Arrhenius equation.Using the molar concentrations of the reactants and the order of the reaction.

• Unit of rate constant is dependent on the order of reaction and is given:

• Zero order reaction : mol.L-1.s-1

• First order reaction : s-1

• Second order reaction : M-1.s-1

• Third order reaction : M-2.s-1

• Following are the ways to express rate constant:

$k = \frac{Rate}{[A] {}^{a} [B] {}^{b} }$

Where,

• k is the rate constant

• [A] and [B] are the molar concentration of reactants A and B

• a and b are the order of reaction.

• Rate constant from the Arrhenius equation,

$k=Ae {}^{ \frac{−Ea}{RT} }$

Where,

• A is the frequency of particle collision

• Ea is the activation energy

• R is the universal gas constant

• T is the absolute temperature

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