Chemical Equilibrium

• what does dynamic equilibrium mean?


  it occurs when the rate of the forwards reaction equals the rate of the reverse reaction and the concentration of reactants and products remain constant in a closed system
• what factors can alter the position of the equilibrium?

  • concentration of reactants or products
  • pressure
  • temperature
• explain Le Chatelier's principle 


  if a system at equilibrium is disturbed the equilibrium moved in the direction that tends to reduce the disturbance
• equilibrium to left

  
• equilibrium to left

  
• what effect does a catalyst have on the position of equilibrium?

  No effect ( catalyst affects rate of forward and reverse reaction equally)
• what condition affects the value of Kc?

  temperature
• what does Kc being greater or less than 1 suggest for the postion of equilibrium?


  greater than 1 = over to the right

  less than 1 = over to the left
• what effect does decreasing the temperature in an endo reaction have on Kc ?

  Kc decreases
• chemical equilibrium

  
• what type of system is Kc relevant for?

  homogeneous systems in eqilibrium
• what effect does increasing temperature of an endo reaction have on Kc?

  Kc increases
• what effect does decreasing the temperature of an exothermic reaction have on Kc?

  Kc increases
• what effect does increasing the temperature of an exothermic reaction have on Kc?

  Kc decreases