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Rate of Chemical Reaction

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Estimated time: 7 minutes
Maharashtra State Board: Class 10

Rate of Chemical Reaction

Chemical reactions occur at different speeds. Some reactions happen quickly, while others take a long time to complete. Based on their speed, they can be classified into two groups:

1. Fast Reactions (Occur Quickly)

  • Cooking gas starts burning on ignition.
  • Effervescence forms when baking soda is added to dilute acid.
  • A white precipitate forms when dilute sulphuric acid is added to barium chloride solution.

2. Slow Reactions (Take Time)

  • Iron articles undergo rusting.
  • Rocks erode to form soil.
  • Alcohol forms when yeast is mixed with a glucose solution under proper conditions.

The rate of a reaction can change with different conditions. For example, milk takes longer to turn into curd in winter, but the process speeds up in summer due to higher temperatures.

CBSE: Class 12

Definition: Rate of Reaction

The rate of a chemical reaction may be defined as the change in concentration of any of the reactants or any of the products per unit time.

Rate of Reaction = `"Change in concentration of a reactant or a prodect"/"Time taken for the change"`

CBSE: Class 12

Formula: Rate of Disappearance

\[\mathrm{Rate}=\frac{\text{Decrease in concentration of Reactant}}{\text{Time interval}}\]

\[=-\frac{\Delta[R]}{\Delta T}\]

CBSE: Class 12

Formula: Rate of Appearance

\[\mathrm{Rate}=\frac{\text{Increase in concentration of Product}}{\text{Time interval}}\]

\[=+\frac{\Delta\left[P\right]}{\Delta T}\]

CBSE: Class 12

Formula: Differential Rate Equation

For a general reaction aA + bB → cC + dD:

\[\frac{dx}{dt}=-\frac{1}{a}\frac{d[A]}{dt}=-\frac{1}{b}\frac{d[B]}{dt}=+\frac{1}{c}\frac{d[C]}{dt}=+\frac{1}{d}\frac{d[D]}{dt}\]

Shaalaa.com | Chemical Kinetics part 1 (Introduction)

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