Chemical Reactions: Enthalpy and Gibbs Free Energy Quiz
18 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the change in entropy for the given reaction?

  • 56.5 J/K
  • 186.8 J/K
  • -130 J/K (correct)
  • -138.1 J/K

    • What is the standard enthalpy change for the reaction?

  • -92.31 kJ/mol
  • -467.0 kJ/mol (correct)
  • 0 kJ/mol
  • -167.080 kJ/mol

    • Which value represents the Gibbs free energy at a temperature of 20°C?

  • 263 C (correct)
  • -693 C
  • 693 C
  • -263 C

    • What is the change in Gibbs free energy for the given reaction at 25°C?

    <p>-186.8 kJ/mol K</p> Signup and view all the answers

    At what temperature does the change in enthalpy equal -149.54 kJ?

    <p>0°C</p> Signup and view all the answers

    For a spontaneous reaction, what combination of changes in entropy and enthalpy would typically be observed?

    <p>Positive entropy and negative enthalpy change</p> Signup and view all the answers

    What is the Gibbs Free Energy value for the given reaction 𝑴𝒈+𝟐 (𝒂𝒒) + 𝑯𝑪𝒍 (𝒈) → 𝑴𝒈+𝟐 (𝒂𝒒)+ 𝟐𝑪𝒍− (𝒂𝒒) + 𝑯𝟐 (𝒈) at 20 degrees Celsius?

    <p>-58.79 kJ/mol</p> Signup and view all the answers

    Which class of reaction is characterized by having a positive Gibbs Free Energy value?

    <p>Endergonic - Non-Spontaneous</p> Signup and view all the answers

    What does a negative Gibbs Free Energy value imply for a process?

    <p>The process is spontaneous.</p> Signup and view all the answers

    In which direction does energy flow in a reaction with a negative Gibbs Free Energy value?

    <p>From hot to cold</p> Signup and view all the answers

    What is the formula to calculate the change in Gibbs Free Energy (△G) for a system?

    <p>△G = △H - T△S</p> Signup and view all the answers

    Which parameter can be used to classify reactions based on the change in free energy of the reaction?

    <p>Gibbs Free Energy (△G)</p> Signup and view all the answers

    Which formula is used to calculate Gibbs Free Energy?

    <p>G = ΔH - TΔS</p> Signup and view all the answers

    In a spontaneous reaction, the Gibbs Free Energy value is typically:

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

    What is the entropy change for the reaction: 2 Al(s) + 6 HCl(g) → 2 AlCl3(s) + 3 H2(s)?

    <p>-28.3 J/mol K</p> Signup and view all the answers

    Which of the following reactions is exergonic/exothermic?

    <p>2 Al(s) + 7/2 O2(g) → Al2O3(s)</p> Signup and view all the answers

    Which of the following changes is associated with more randomness?

    <ul> <li>2 mol K -&gt; + 130.6 J</li> </ul> Signup and view all the answers

    What is the heat change (∆H) for the reaction: Al(s) + HCl(g) → AlCl3(s) + H2(g)?

    <p>-1781.6 kJ/mol</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser