Le Chateliers principle

• What does Le Chatelier's principle describe?

  how the conditions of the closed system affect the position of equilibrium
• 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
• What does it mean if the equilibrium lies to the left?

  More reactants than products present
• What does it mean if the equilibrium lies to the right?

  More products than reactants present
• What happens to the position of equilibrium when conditions change?

  It shifts to counteract the change
• 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 reaction
• What happens to equilibrium if the temperature is decreased?

  It shifts to the exothermic direction
• What happens to equilibrium if the temperature is increased?

  It shifts to the endothermic direction
• What is the effect of increasing pressure on equilibrium?

  It shifts to the side with fewer molecules
• What happens to equilibrium if pressure is decreased?

  It shifts to the side with more molecules
• What are the key factors affecting equilibrium according to Le Chatelier's principle?

  • Temperature
  • Pressure
  • Concentration
• How does the position of equilibrium change with temperature adjustments?

  • Decreasing temperature: shifts to exothermic direction
  • Increasing temperature: shifts to endothermic direction
• How does the position of equilibrium change with pressure adjustments?

  • 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 adjustments?

  • Adding reactants: shifts to product side
  • Removing reactants: shifts to reactant side
• what does increasing the temperature do

  it favours the endothermic reaction
• what does decreasing the temperature do

  it favours the exothermic reaction
• what does increasing the pressure do

  it favours the side with the fewer moles of gas
• what does decreasing the pressure do

  it favours the side of reaction with ore moles of gas
• what will happen if the system at equilibrium is stressed by changing the conditions

  the position of equilibrium will move in the direction that counter acts the change
• at does yield mean

  the amount of something