Rate and Extent of Reaction

• Reaction rate


  Define reaction rate as the change in concentration of reactants or products per unit time.
• Rate


  = Dc/Dt

  (Unit: mol∙dm-3 .s -1).
• Catalyst


  Define the term catalyst as a substance that increases the rate of a chemical reaction without itself undergoing a permanent change
• Function of a catalyst 


  A catalyst increases the rate of a reaction by providing an alternative path of lower activation energy. It therefore decreases the net activation energy