Chemical Equilibrium Concepts
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Chemical Equilibrium Concepts

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Questions and Answers

What does a large value of the equilibrium constant Kc indicate about a reaction?

  • The reaction consumes most reactants. (correct)
  • The reaction goes to completion. (correct)
  • The reaction has equal amounts of reactants and products.
  • The reaction is at static equilibrium.

    • In a static equilibrium, the concentrations of reactants and products do not change over time.

    True

    What is dynamic equilibrium?

    Dynamic equilibrium is a state where the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products.

    Reversible reactions can proceed in both _____ and _____ directions.

    <p>forward, reverse</p> Signup and view all the answers

    Match the following characteristics with their respective types of equilibrium:

    <p>Dynamic Equilibrium = Constant concentrations but ongoing reactions Static Equilibrium = No change in concentration Reversible Reactions = Can proceed in both forward and reverse directions Reaction Rates = Speed at which reactants are converted to products</p> Signup and view all the answers

    Which of the following statements best describes dynamic equilibrium?

    <p>The rate of forward and reverse reactions are equal.</p> Signup and view all the answers

    At equilibrium, the concentrations of reactants and products change over time.

    <p>False</p> Signup and view all the answers

    What is needed for an equilibrium state to be achieved in a chemical reaction?

    <p>A closed system</p> Signup and view all the answers

    In a reversible reaction, products can __________ back to form reactants.

    <p>decompose</p> Signup and view all the answers

    Match the following terms with their correct characteristics:

    <p>Dynamic Equilibrium = Rates of forward and reverse reactions are equal. Static Equilibrium = No movement; reaction has stopped. Reversible Reaction = Products can revert to reactants. Closed System = Substances cannot enter or leave.</p> Signup and view all the answers

    Study Notes

    Reversible Reactions

    • Reactions where products can recombine to form reactants.
    • These reactions never complete.
    • Proceed in both directions: forward and reverse.

    Dynamic Equilibrium

    • Forward and reverse reactions occur at equal rates but in opposite directions.
    • Equilibrium state means the overall reaction does not stop.
    • Achievable only in closed systems where no substances can enter or leave.
    • At equilibrium, the amount of reactants and products remains constant.
    • Physical properties like color, density remain constant.
    • Equilibrium state is attainable from either direction: starting with reactants or products.

    Equilibrium Constant

    • Indicates the extent of a reaction at equilibrium.
    • Large Kc: The reaction proceeds almost to completion, with mostly products remaining.
    • Small Kc: The reaction reaches equilibrium with little conversion of reactants to products.
    • Moderate Kc: Comparable amounts of reactants and products at equilibrium.

    Factors that Affect Equilibrium State

    • Concentration
    • Pressure
    • Temperature

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    Chapter 9 Chemical Equilibrium PDF

    Description

    This quiz explores the key concepts of reversible reactions, dynamic equilibrium, and the equilibrium constant. You will learn about how reactions can proceed in both directions and the conditions required for equilibrium to be achieved. Test your understanding of the principles dictating chemical reactions and their behaviors in closed systems.

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