Le Chatelier's Principle

• What principle is covered in this video?

  Le Chatelier's principle
• What does Le Chatelier's principle describe?

  It describes how the position of equilibrium is affected by changes in temperature, pressure, and concentration.
• What does the position of equilibrium refer to?

  It refers to the ratio of reactant particles to product particles at equilibrium.
• How do we determine if the equilibrium lies to the left or right?

  The equilibrium lies to the left if there are more reactants and to the right if there are more products.
• What happens to the position of equilibrium if conditions of a reversible reaction change?

  The position of equilibrium will shift to counteract the change.
• In the production of ammonia, what is the overall energy change of the forward reaction?

  • 92 kilojoules per mole
• What does a negative energy change indicate about the forward reaction?

  It indicates that the forward reaction is exothermic.
• What type of reaction is the backward reaction if the forward reaction is exothermic?

  The backward reaction is endothermic.
• What happens to the position of equilibrium if the temperature is decreased in an exothermic reaction?

  The equilibrium will shift to the right to produce more ammonia.
• What happens to the position of equilibrium if the temperature is increased in an exothermic reaction?

  The equilibrium will shift to the left to produce more nitrogen and hydrogen.
• How does increasing pressure affect the position of equilibrium?

  The equilibrium will shift to the side with fewer molecules to reduce pressure.
• In the ammonia production reaction, which side has fewer molecules?

  The right side has two molecules of ammonia.
• What happens to the position of equilibrium if pressure is decreased?

  The equilibrium will shift to the left to increase the number of molecules.
• What occurs if more nitrogen is added to the sealed container?

  The equilibrium will shift to the right to form more ammonia.
• What are the factors that affect the position of equilibrium according to Le Chatelier's principle?

  • Temperature
  • Pressure
  • Concentration
• How does the position of equilibrium change with temperature in an exothermic reaction?

  • Decreasing temperature: shifts right (more products)
  • Increasing temperature: shifts left (more reactants)
• How does the position of equilibrium change with pressure in a reaction?

  • Increasing pressure: shifts to side with fewer molecules
  • Decreasing pressure: shifts to side with more molecules
• How does the position of equilibrium change with concentration changes?

  • Adding reactants: shifts to products
  • Adding products: shifts to reactants