9.1 Rate of Reaction

9.1    Rate of  Reaction

What is the rate of  reaction?

  • Rate of reaction is the change in concentration of reactants or products per unit time. It refers to the rate of product formed or the rate of reactant used up
  • A balanced chemical equation gives no information about the rate of reaction. It has to be measured experimentally
  • The rate of reaction can also be obtained by calculating the gradient of a concentration-time graph
  • The higher the gradient(the steeper the graph), the higher the rate of reaction
  • The gradient of the graph decreases with time, this shows that the rate of reaction is inversely proportional to time. Which means, the rate of reaction decreases as the reaction proceeds


Collision theory

  • The collision theory states that, for the particles to react with each other, they must collide in the correct orientation with energy greater than or equal to the activation energy.
  • The activation energy is the minimum energy that that the reacting particles must possess for a successful collision to take place
  • Every reaction has a specific activation energy


  • If the collision results in the reactants changing into products, it is said to be an effective(or successful) collision


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