Chemical Equilibrium: Reversible Reactions and Equilibrium Constant
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Questions and Answers

What is the defining characteristic of a reversible reaction?

  • It involves only reactants
  • It only occurs in one direction
  • It proceeds to completion
  • It reaches an equilibrium state (correct)

    • What is the necessary condition for equilibrium in a reversible reaction?

  • Equal concentrations of reactants and products (correct)
  • Presence of catalysts
  • Absence of products
  • Unlimited supply of reactants

    • In a complete reaction, what happens to all the reactants?

  • They are converted into products (correct)
  • They disappear
  • They are used up
  • They remain unchanged

    • What is the Law of Mass Action related to?

    <p>Concentration of reactants and products</p> Signup and view all the answers

    What happens to most chemical reactions in terms of completion?

    <p>They never go to completion</p> Signup and view all the answers

    What is responsible for the existence of life on Earth?

    <p>The delicate equilibrium phenomenon in the atmosphere</p> Signup and view all the answers

    What is the macroscopic characteristic of the reverse reaction in a reversible reaction?

    <p>Equal rate with the forward reaction</p> Signup and view all the answers

    What do reversible reactions in chemistry involve?

    <p>Products recombining to form reactants</p> Signup and view all the answers

    What is the main characteristic of irreversible reactions?

    <p>They never go to completion</p> Signup and view all the answers

    What is a common example of a reversible reaction in everyday life?

    <p>Formation of water from hydrogen and oxygen</p> Signup and view all the answers

    What happens when hydrogen iodide is heated in a closed flask?

    <p>Formation of purple iodine vapors</p> Signup and view all the answers

    What does the purple color fading in the reaction between hydrogen and iodine indicate?

    <p>The forward reaction</p> Signup and view all the answers

    What do aquatic plants and animals indirectly depend on for their lives?

    <p>The concentration of dissolved oxygen in water</p> Signup and view all the answers

    What is the main role of equilibrium phenomenon in the atmosphere for life on Earth?

    <p>Supporting the existence of life on Earth</p> Signup and view all the answers

    What does the delicate equilibrium phenomenon support in environmental systems?

    <p>The existence and balance of environmental systems</p> Signup and view all the answers

    What do irreversible reactions involve?

    <p>Formation of new substances only</p> Signup and view all the answers

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