Reversible Reactions

• What is meant by a reversible reaction?

  It is a reaction where the products can react to reform the original reactants.
• What is meant by equilibrium in a reversible reaction?

  Equilibrium is the point where the forward and reverse reactions occur at exactly the same rate.
• What happens to the direction of a reversible reaction when conditions are changed?

  • The direction can be changed by altering conditions.
  • Heating may drive the reaction forward.
  • Cooling may drive the reaction backward.
• What is the energy change in the forward reaction of hydrated copper sulfate when heated?

  It is endothermic, absorbing energy.
• What is the energy change in the reverse reaction of anhydrous copper sulfate when water is added?

  It is exothermic, releasing energy.
• How do the energy changes in a reversible reaction relate to each direction of the reaction?

  • If a reversible reaction is exothermic in one direction, it is endothermic in the opposite direction.
  • The same amount of energy is transferred in each case.
• What is the color change observed when heating hydrated copper sulfate?

  It changes from blue to white.
• What is produced when hydrated copper sulfate is heated?

  Anhydrous copper sulfate and water are produced.
• What occurs at equilibrium in a sealed container during a reversible reaction?

  • The forward and reverse reactions occur at the same rate.
  • No net change in the concentration of reactants and products.
• Why is the copper sulfate reaction important for exams?

  It is often asked in exams.