Le Chatelier's Principle Lesson 2

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If a system in equilibrium is stressed it shifts in the opposite direction to reach a new equilibrium. ⇌ reactants products Chemists can shift the reaction to the Products or Reactants Left

If a system in equilibrium is stressed it shifts in the opposite direction to reach a new equilibrium. ⇌ reactants products Chemists can shift the reaction to the Products or Reactants Left

If a system in equilibrium is stressed it shifts in the opposite direction to reach a new equilibrium. ⇌ reactants products Chemists can shift the reaction to the Products or Reactants Right

If a system in equilibrium is stressed it shifts in the opposite direction to reach a new equilibrium. ⇌ reactants products Chemists can shift the reaction to the Products or Reactants Right

If a system in equilibrium is stressed it shifts in the opposite direction to reach a new equilibrium. ⇌ reactants products Chemists can shift the reaction to the Products or Reactants Right

If a system in equilibrium is stressed it shifts in the opposite direction to reach a new equilibrium. ⇌ reactants products Chemists can shift the reaction to the Products or Reactants Right

1.1 Increasing the temperature shifts in the direction that decreases energy: A + B ⇌ C + Energy stress- increase Tempreaction- shifts left

1.1 Increasing the temperature shifts in the direction that decreases energy: A + B + Energy ⇌ C stress- increase Tempreaction- shifts right

1.2 Decreasing the temperature shifts in the direction that increases energy. A + B + Energy ⇌ C stress- decrease Tempreaction- shifts left

2.1 Adding a reactant or product shifts the reaction in the direction that removes them. A + B ⇌ C + Energy reaction- shifts rightstress- increase [A]

2.2 Adding a reactant or product shifts in the direction that removes them. A + B ⇌ C + Energy stress- increase [C]reaction- shifts left

2.3 Removing a reactant or product shifts in the opposite direction. A + B ⇌ C + Energy stress- decrease [A]reaction- shifts left

2.4 Removing a reactant or product shifts in the opposite direction. A + B ⇌ C + Energy stress- decrease [C]reaction- shifts right

3.1Only changes to (aq) and (g) reactants or products cause the equilibrium to shift (s) and (l) have constant concentrations You can change the concentrations of (aq) and (g) CaCO 3(s) + 2H + (aq) + 2Cl - (aq) ⇌ Ca 2+ (aq) + Cl 2 (g) + CO 2(g) + H 2 O (l) (s) and (l) do not! no shift rightleft rightno shift

reactants 4.1Adding a catalyst does not shift the equilibrium Equilibrium is attained faster Forward and reverse rates are increased by the same amount products

5.1 Adding an inert (non-reactive) gas does not shift the equilibrium. Adding Ne (g) 2NH 3(g) ⇌ N 2(g) + 3H 2(g) No shift!

The Forward and Reverse Rates and Shifting Explain in terms of the immediate changes to the forward and reverse rates after each stress why each shift occurs 2CO (g) + O 2(g) ⇄ 2CO 2(g) + energy Shift Forward Reverse No change Increases Right 1.Some CO is added- more reactant collisions.

The Forward and Reverse Rates and Shifting Explain in terms of the immediate changes to the forward and reverse rates after each stress why each shift occurs 2CO (g) + O 2(g) ⇄ 2CO 2(g) + energy 2.CO is removed. Shift Forward Reverse left decreases same

The Forward and Reverse Rates and Shifting Explain in terms of the immediate changes to the forward and reverse rates after each stress why each shift occurs 2CO (g) + O 2(g) ⇄ 2CO 2(g) + energy 3.Temperature is increased- Shift Forward Reverse increases increases by more left both forward and reverse rates increase. We know it shifts left