Le Chatelier's Principle

• What principle is covered in this video?

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

  Position of equilibrium during reversible reactions
• What factors affect the position of equilibrium?

  Temperature, pressure, and concentration
• What does the position of equilibrium refer to?

  Ratio of reactant to product particles
• When is the equilibrium said to lie to the left?

  When there are more reactants
• When is the equilibrium said to lie to the right?

  When there are more products
• What happens to the equilibrium when conditions change?

  It shifts to counteract the change
• What is the reaction for the production of ammonia?

  Nitrogen and hydrogen react to form ammonia
• What is the overall energy change of the forward reaction for ammonia production?

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

  It is exothermic and releases energy
• What type of reaction is the backward reaction if the forward reaction is exothermic?

  Endothermic
• What happens to the equilibrium if the temperature is decreased?

  It moves in the exothermic direction
• What does it mean if the equilibrium moves to the right?

  More ammonia particles are formed
• What happens to the equilibrium if the temperature is increased?

  It moves in the endothermic direction
• What is the effect of increasing pressure on the equilibrium?

  It moves to the side with fewer molecules
• How many molecules are on the left side of the ammonia reaction?

  Four molecules
• How many molecules are on the right side of the ammonia reaction?

  Two molecules
• What happens to the equilibrium if pressure is decreased?

  It shifts to the side with more molecules
• What happens if more nitrogen is added to the system?

  The equilibrium shifts to the right
• What are the effects of changing temperature, pressure, and concentration on equilibrium?

  • Decreasing temperature shifts equilibrium to exothermic direction
  • Increasing temperature shifts equilibrium to endothermic direction
  • Increasing pressure shifts equilibrium to side with fewer molecules
  • Decreasing pressure shifts equilibrium to side with more molecules
  • Adding reactants shifts equilibrium to product side