• A first-order reaction is a reaction in which the rate is proportional to the concentration of only one reactant.
  • The rate of a reaction is determined graphically by the slope of a tangent to the curve at any point.
  • The rates of some reactions depend on the concentrations of more than one reactants.
  • A reaction is said to be first order with respect to  and second order withrespect to .
  • Overall, it is a second- order reaction.
  • TheRate law and the order of a Reaction must be determined experimentally.
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