Le Chatelier’s Principle
Chemistry ⇒ Chemical Kinetics and Equilibrium
Le Chatelier’s Principle starts at 11 and continues till grade 12.
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See sample questions for grade 12
Describe the effect of decreasing the concentration of a reactant on the position of equilibrium.
Describe the effect of increasing temperature on an endothermic reaction at equilibrium.
Describe the effect of removing a reactant from a system at equilibrium.
Describe what happens to the equilibrium position if an inert gas is added to a reaction mixture at constant volume.
For the reaction: 2A(g) ⇌ B(g) + C(g), if the volume of the container is doubled, what happens to the equilibrium?
For the reaction: 2HI(g) ⇌ H2(g) + I2(g), what will be the effect of decreasing the volume of the container?
For the reaction: 2NO2(g) ⇌ N2O4(g), what will be the effect of increasing the pressure?
For the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), if the temperature is decreased, what happens to the equilibrium if the reaction is exothermic?
When the concentration of a reactant is increased in a system at equilibrium, the equilibrium will shift to: (1) The right (2) The left (3) Remain unchanged (4) Cannot be predicted
Which of the following changes will increase the yield of ammonia in the Haber process (N2 + 3H2 ⇌ 2NH3)? (1) Increasing temperature (2) Increasing pressure (3) Removing NH3 as it forms (4) Both 2 and 3
Which of the following changes will NOT affect the position of equilibrium? (1) Change in temperature (2) Change in pressure (3) Addition of a catalyst (4) Change in concentration
Which of the following changes will shift the equilibrium to the left for the reaction: 2NO2(g) ⇌ N2O4(g)? (1) Increasing pressure (2) Decreasing pressure (3) Removing N2O4 (4) Adding NO2
Fill in the blank: According to Le Chatelier’s Principle, if the concentration of a product is decreased, the equilibrium will shift to produce more _______.
Fill in the blank: Le Chatelier’s Principle can be used to predict the effect of _______ on the position of equilibrium.
Fill in the blank: Le Chatelier’s Principle is a qualitative tool used to predict the _______ of equilibrium shift.
If a system at equilibrium is subjected to a change in concentration, pressure, or temperature, the system will adjust to _______ the effect of the change.
True or False: Increasing the temperature of an exothermic reaction at equilibrium will shift the equilibrium to the left.
True or False: Le Chatelier’s Principle applies only to chemical equilibria, not to physical equilibria.
True or False: Le Chatelier’s Principle can be applied to predict the effect of changing the amount of a pure solid or liquid in a heterogeneous equilibrium.
True or False: Le Chatelier’s Principle can be used to predict the effect of changing the surface area of a solid reactant.
