Temperature Dependence of Rate of Reaction – Class 12 | Chapter – 4 | Chemistry Short Notes Series PDF for NEET & JEE

Temperature Dependence of Rate of Reaction: The rate of a chemical reaction is dependent on several factors, including temperature. Generally, increasing the temperature of a reaction increases the rate at which it occurs. This is due to the fact that higher temperatures increase the average kinetic energy of the reactant molecules, leading to more frequent and energetic collisions between them, which can result in successful reactions.

Temperature Dependence of Rate of Reaction

The temperature dependence of a reaction is typically quantified by the Arrhenius equation:

k = Ae(-Ea/RT)


  • k is the rate constant
  • A is the pre-exponential factor
  • Ea is the activation energy
  • R is the gas constant
  • T is the temperature in Kelvin

The Arrhenius equation shows that the rate constant (k) increases exponentially with temperature, meaning that even small increases in temperature can have a significant effect on the reaction rate. The activation energy (Ea) is a measure of the energy required for the reactant molecules to overcome the energy barrier and undergo a reaction. As the temperature increases, the number of molecules with sufficient energy to overcome this barrier also increases, leading to an increase in the reaction rate.

It is important to note that the temperature dependence of a reaction can also be used to determine the activation energy of the reaction, which is a fundamental parameter that provides insight into the mechanism and nature of the reaction. By measuring the rate of the reaction at different temperatures and applying the Arrhenius equation, the activation energy can be calculated.

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By Team Learning Mantras