Topic 6 Equilibria

• Define le chataliers principle [2]

  If a reaction is at equilibrium it is subjected to a change in concentration, pressure or temperature, the position of equilibrium will move to counteract the change.
• How does a change in concentration effect le chataliers principle [4]

  If you increase the concentration of a reactant, the equilibrium tries to get rid of the extra reactant. It does this ny making more product. So equilibrium shifts to the right.

  If you increase the concentration of product, the equilibrium tries to remove the extra product. This makes the reverse reaction go faster. So the equilibrium shifts to the left. Decreasing the concentration has the opposite effect.
• How does a change in pressure effect le chataliers principle? [2]

  Only effects gasses. Increasing the pressure shifts the equilibrium to the side with fewer gas molecules. This reduces the pressure. Decreasing the pressure shifts the equilibrium to the side with more gas molecules. This raises the pressure again.
• How does a change in temperature effect le chataliers principle? [2]

  Increasing the temperature means adding heat. The equilibrium shifts in the endothermic direction to absorb this heat. Decreasing the temperature means to remove heat. The equilibrium shifts in the exothermic direction to produce more heat in order to counteract the reaction.
• How does a catalyst effect le chataliers principle? [1]

  It has NO effect on the position of equilibrium. They can’t increase yield but they do mean equilibrium is reached faster
• What is the equilibrium constant for a+ bB <=> did + eE

  kc= [D]d [E]e/ [A]a [B]b