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The Equilibrium State quiz

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  • What does it mean when a chemical reaction does not go to completion?
    It means that not all reactants are converted into products, and some reactants remain when equilibrium is reached.
  • What is chemical equilibrium?
    Chemical equilibrium is the state where the rates of the forward and reverse reactions are equal, so the concentrations of reactants and products remain constant.
  • How is the equilibrium constant (K) related to the rate constants of a reaction?
    The equilibrium constant K is equal to the rate constant of the forward reaction divided by the rate constant of the reverse reaction.
  • How do you write the equilibrium expression for a reaction?
    The equilibrium expression is written as the concentration of products raised to their coefficients divided by the concentration of reactants raised to their coefficients, ignoring solids and liquids.
  • What does a K value greater than 1 indicate about a reaction?
    A K value greater than 1 means the forward direction is favored and more products are formed at equilibrium.
  • What does a K value less than 1 indicate about a reaction?
    A K value less than 1 means the reverse direction is favored and more reactants remain at equilibrium.
  • What does a K value equal to 1 indicate?
    A K value equal to 1 means neither direction is favored and the concentrations of products and reactants are equal at equilibrium.
  • At the start of a reaction, which rate is present: forward or reverse?
    At the start, only the forward rate is present because there are only reactants and no products yet.
  • Why does the forward rate decrease over time in a reaction?
    The forward rate decreases because the concentration of reactants decreases as they are converted into products.
  • When does the reverse rate begin to increase in a reaction?
    The reverse rate increases as products accumulate and begin to convert back into reactants.
  • How can equilibrium be visually identified on a concentration vs. time graph?
    Equilibrium is reached when the concentrations of reactants and products plateau and stop changing over time.
  • What is ignored when writing the equilibrium expression?
    Solids and liquids are ignored when writing the equilibrium expression.
  • What happens to the rates of the forward and reverse reactions at equilibrium?
    At equilibrium, the rates of the forward and reverse reactions are equal.
  • How can the value of K help predict the outcome of a reaction?
    The value of K indicates whether products or reactants are favored at equilibrium, helping predict the direction the reaction will proceed.
  • What must happen before equilibrium can be established in a chemical reaction?
    Equilibrium can only be established once the rates of the forward and reverse reactions become equal.