Reversible reactions

• What is Le Chatelier's principle?

  If a change is made to a reversible reaction at equilibrium, the reaction will move to oppose that change.
• How does increasing pressure affect the number of molecules in a reaction?

  Increasing pressure favors the side with fewer molecules.
• What happens to a reaction at equilibrium if the temperature is decreased in an exothermic reaction?


  The reaction will shift to the right to produce more heat.
• What is the effect of decreasing pressure on a reaction with more molecules on one side?

  Decreasing pressure favors the side with more molecules.
• What are the effects of temperature changes on endothermic and exothermic reactions?

  • Exothermic reactions:
  • Temperature down favors the forward reaction.
  • Endothermic reactions:
  • Temperature up favors the forward reaction.
• What is the definition of dynamic equilibrium in a reversible reaction?

  It is the position in a closed reversible reaction when the forward reaction rate equals the backward reaction rate.
• What happens to the concentrations of chemicals at dynamic equilibrium?

  The concentrations of the chemicals remain constant.
• What is the hydrated form of copper(II) sulfate?

  CuSO₄·5H₂O
• What occurs when energy is added to a reversible reaction?

  Some amount of energy is released in the reverse direction.
• What is the effect of increasing temperature on endothermic reactions?

  It favors the forward reaction.
• What is the effect of decreasing temperature on exothermic reactions?

  It favors the forward reaction.
• How does the number of molecules affect the direction of a reaction when pressure is changed?

  Higher pressure favors fewer molecules, while lower pressure favors more molecules.