• reversible reaction is a reaction in which conversion of reactants to products and the conversion of products to reactants occur simultaneously.
  • A great many chemical reactions do not proceed entirely to completion.
  • The reaction of hydrogen gas and iodine vapor to from hydrogen iodide is an example of a reversible reaction.
  • The forward and reverse reactions can be written as follows.
  • In the forward reaction, hydrogen and iodine combine to form hydrogen iodides.
  • The reverse reaction decomposes back into hydrogen and I2.
  • When the rates of the forward andreverse reactions have become equal to one another, the reaction has achieved a state of balance.
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