Chemical Equilibrium Criteria and Expression Quiz
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Questions and Answers

What is the condition for chemical equilibrium?

  • Concentrations of reactants are constant
  • Rates of forward reaction equal rates of reverse reaction (correct)
  • Concentrations of products are higher than reactants
  • Rates of forward reaction are faster than reverse reaction
  • What does the equilibrium expression represent?

  • Volume change during a reaction
  • Rate of the forward reaction
  • Temperature dependence of a reaction
  • Concentrations of product and reactant in a reaction (correct)
  • What does the equilibrium constant, K, predict?

  • Temperature at which equilibrium is achieved
  • Initial concentrations of reactants
  • Rate of the chemical reaction
  • Extent of established chemical reaction (correct)
  • What is a characteristic of the equilibrium constant, K?

    <p>Dimensionless quantity</p> Signup and view all the answers

    Which factor determines the direction of the net reaction in a given set of initial concentrations?

    <p>Equilibrium constant, K</p> Signup and view all the answers

    What does Le Châtelier's Principle help predict in a system at equilibrium?

    <p>The effect of disturbances on an equilibrium system</p> Signup and view all the answers

    According to the Debye-Hückel equation, how does the activity coefficient of an ion change with increasing ionic strength?

    <p>The activity coefficient decreases</p> Signup and view all the answers

    How does the charge of an ion affect the departure of its activity coefficient from unity?

    <p>The departure from unity increases with increasing charge</p> Signup and view all the answers

    What is the relationship between ion size and activity effects?

    <p>Activity effects increase with decreasing ion size</p> Signup and view all the answers

    Which of the following equilibria is NOT affected by the ionic strength of the solution?

    <p>Redox equilibria</p> Signup and view all the answers

    If the activity coefficient of Ca2+ is found using the Debye-Hückel equation, what parameter is NOT needed for the calculation?

    <p>The concentration of Ca2+</p> Signup and view all the answers

    How does Le Châtelier's principle apply to the effect of ionic strength on chemical reactions?

    <p>Increasing ionic strength shifts the equilibrium towards the products</p> Signup and view all the answers

    What is the effect of adding a reactant to a homogeneous equilibrium system?

    <p>The equilibrium shifts to the right</p> Signup and view all the answers

    What type of equilibrium is represented by the reaction CaCO3(s) + H2O(l) + CO2(aq) ⇄ Ca2+(aq) + 2HCO3-(aq)?

    <p>Heterogeneous equilibrium</p> Signup and view all the answers

    Which of the following statements about Le Châtelier's principle is correct?

    <p>The system adjusts to partially offset the stress applied to the system</p> Signup and view all the answers

    Which of the following is not a form of equilibrium?

    <p>Temperature equilibrium</p> Signup and view all the answers

    What happens to a heterogeneous equilibrium system when the temperature is decreased?

    <p>The equilibrium shifts to the left</p> Signup and view all the answers

    What is the effect of increasing pressure on a system where the number of gas molecules on the reactant side is greater than the number of gas molecules on the product side?

    <p>The equilibrium shifts to the right</p> Signup and view all the answers

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