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Le Chatelier's Principle quiz #1

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Terms in this set (10)

  • What does Le Chatelier's principle state about a system at equilibrium when it is disturbed?
    Le Chatelier's principle states that if a system at equilibrium is disturbed, it will shift in a direction that counteracts the disturbance and reestablishes equilibrium.
  • According to Le Chatelier’s principle, how does a chemical system at equilibrium respond to a disturbance?
    According to Le Chatelier’s principle, a chemical system at equilibrium will shift in a direction that minimizes the effect of the disturbance and restores equilibrium.
  • What will happen to the chemical equilibrium if the temperature of the system is increased?
    If the temperature of the system is increased, the equilibrium will shift in the direction that absorbs heat: toward the products in an endothermic reaction, or toward the reactants in an exothermic reaction.
  • What actions would shift the equilibrium of CaF2(s) ⇌ Ca2+(aq) + 2F−(aq) toward the formation of solid calcium fluoride?
    Removing Ca2+ or F− ions from the solution, or adding a compound that reacts with Ca2+ or F−, would shift the equilibrium toward the formation of solid calcium fluoride.
  • How does the addition of an inert gas at constant volume affect the position of equilibrium in a gaseous reaction?
    Adding an inert gas at constant volume does not affect the position of equilibrium because it does not change the partial pressures of the reacting gases.
  • What is the effect of a catalyst on the equilibrium position of a chemical reaction?
    A catalyst does not change the equilibrium position; it only increases the rate at which equilibrium is reached by lowering the activation energy.
  • How does decreasing the volume of a container affect the equilibrium of a reaction involving gases?
    Decreasing the volume increases the pressure, causing the equilibrium to shift toward the side with fewer moles of gas.
  • What happens to the equilibrium constant (K) when the temperature of a reaction changes?
    The equilibrium constant (K) is temperature-dependent and will change when the temperature of the reaction changes.
  • How does Le Chatelier’s principle relate to thermodynamics in chemical reactions?
    Le Chatelier’s principle describes the direction a reaction shifts to restore equilibrium, which is a concept rooted in thermodynamics.
  • What is the difference between how kinetics and thermodynamics describe chemical reactions?
    Kinetics describes the rate or speed of a reaction, while thermodynamics determines the direction in which a reaction will shift at equilibrium.