Chemical Reactions: Reversible and Irreversible
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Questions and Answers

What symbol is used to represent irreversible reactions?

  • → (correct)
  • +
  • ⇌
  • ∆G‡

    • What is the meaning of 'reaction equilibrium'?

  • When the rate of the forward reaction is zero
  • When there is no activation energy
  • When the rate of the forward reaction equals the rate of the reverse reaction (correct)
  • When the energy levels of the ground state and transition state are equal

    • What does a bidirectional arrow (⇌) represent in a chemical reaction?

  • Activation energy
  • Reversible reaction (correct)
  • Transition state
  • Irreversible reaction

    • What is the purpose of enzymes in biological systems?

    <p>Act as catalysts</p> Signup and view all the answers

    What is the role of activation energy (∆G‡) in a chemical reaction?

    <p>Increases reaction rate</p> Signup and view all the answers

    How can reaction rates be effectively increased?

    <p>Raising the temperature</p> Signup and view all the answers

    What is a reaction intermediate?

    <p>A chemical species with a finite chemical lifetime</p> Signup and view all the answers

    In an enzyme-catalyzed reaction, which complexes can be considered intermediates?

    <p>ES and EP complexes</p> Signup and view all the answers

    What determines the overall rate of a reaction with several steps?

    <p>The step with the highest activation energy</p> Signup and view all the answers

    What is the highest-energy point in the reaction coordinate diagram called?

    <p>Transition state</p> Signup and view all the answers

    In enzyme-catalyzed reactions, what are less stable chemical intermediates called?

    <p>Unstable intermediates</p> Signup and view all the answers

    What term is used for the step(s) that have similar activation energies in a reaction?

    <p>Rate-limiting step</p> Signup and view all the answers

    What is the main difference between allosteric and non-allosteric enzymes?

    <p>Non-allosteric enzymes have only an active site, while allosteric enzymes have an additional regulatory site.</p> Signup and view all the answers

    Which type of reaction proceeds in both directions, allowing reactants to reform the products as well?

    <p>Reversible reaction</p> Signup and view all the answers

    What is the role of a catalyst in a chemical reaction?

    <p>To increase the rate of the reaction</p> Signup and view all the answers

    How are irreversible reactions represented?

    <p>One-directional arrow (→)</p> Signup and view all the answers

    Which type of enzyme has transient complexes involving the enzyme, substrate, and product?

    <p>Allosteric enzymes</p> Signup and view all the answers

    What aspect of a chemical reaction is influenced by enzymes?

    <p>The speed at which reactants disappear</p> Signup and view all the answers

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