CBSE Class 12 Chemistry Notes: Chemical Kinetics – Factors Affecting the Rate of Reaction

CBSE Class 12 Chemistry Notes: Chemical Kinetics   Factors Affecting the Rate of ReactionNature of Reactants:

  • Ionic compounds react quickly.
  • When covalent compounds react, bond cleavage and new bond formation occurs so they react slowly
  • Homogeneous reaction is fast in comparison to Heterogeneous reactions, due to better intermixing of molecules.
  • Activation energy depends on chemical nature of reactants. If Activations energy is high reaction rate is slow and vice versa.

Concentration of Reactants:

  • Rate of reaction a product of active masses concentration.
  • As concentration Increase, rate of reaction increase due to increase the number of effective collision.
  • In gas phase reaction, increase in pressure results in increase in rate of reaction.

Time:

  • For Irreversible reaction rate of irreversible reaction decrease, with time
  • For reversible reaction rate of forward reaction decrease and backward reaction increase with time
  • In autocatalytic reaction rate increase with time.

Temperature:

  • The rate of reaction increases, with increase in temp.
  • Temperature Coefficient:

In the vicinity of 27oC, when the temperature of a reaction is raised by 10oC, rate of reaction becomes 2-3 times. Then ratio of rate constants of these 2 temp(s) is called as Temperature Coefficients

CBSE Class 12 Chemistry Notes: Chemical Kinetics   Factors Affecting the Rate of Reaction

CBSE Class 12 Chemistry Notes: Chemical Kinetics   Factors Affecting the Rate of Reaction

The above formula is valid for temperature closed to room temperature.

CBSE Class 12 Chemistry Notes: Chemical Kinetics   Factors Affecting the Rate of Reaction

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