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The Reaction Quotient quiz

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  • What does the reaction quotient (Q) help us determine in a chemical reaction?
    Q helps us determine if a chemical reaction is at equilibrium.
  • How is the reaction quotient (Q) calculated?
    Q is calculated as the concentration of products over the concentration of reactants, ignoring solids and liquids.
  • What does it mean if Q equals the equilibrium constant (K)?
    If Q equals K, the reaction is at equilibrium and no shift will occur.
  • What happens if Q is less than K?
    If Q is less than K, the reaction will shift forward (toward products) to reach equilibrium.
  • What happens if Q is greater than K?
    If Q is greater than K, the reaction will shift backward (toward reactants) to reach equilibrium.
  • When calculating Q, which phases of matter are ignored?
    Solids and liquids are ignored when calculating Q.
  • If a reaction shifts toward the products, what happens to the amount of products and reactants?
    The amount of products increases while the amount of reactants decreases.
  • If a reaction shifts toward the reactants, what happens to the amount of reactants and products?
    The amount of reactants increases while the amount of products decreases.
  • What is the relationship between Q and K at equilibrium?
    At equilibrium, Q equals K.
  • Why does Q always shift to reach K?
    Q shifts to reach K because the system seeks equilibrium.
  • In the expression for Q, what would the formula be for the reaction A(g) ⇌ B(g)?
    The formula for Q would be [B]/[A].
  • If Q is calculated to be 10 and K is 50, which direction will the reaction shift?
    The reaction will shift forward, toward the products, to reach equilibrium.
  • If Q is calculated to be 140 and K is 50, which direction will the reaction shift?
    The reaction will shift backward, toward the reactants, to reach equilibrium.
  • What does it mean for the system if both sides of a reaction were increasing or decreasing together?
    It would disrupt the balance; only one side can increase while the other decreases.
  • What fundamental steps should you follow to determine the direction of a reaction shift?
    Calculate Q, compare it to K, and determine which direction the reaction must shift to reach equilibrium.