Gibbs Free Energy and Spontaneity Quiz
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Questions and Answers

What happens to the heat in an endothermic reaction?

  • Heat is absorbed (correct)
  • Heat remains constant
  • Heat is emitted
  • Heat is released

    • According to the Second Law of Thermodynamics, what is the direction of heat flow?

  • From an endothermic object to an exothermic one
  • From a colder object to a hotter one
  • From a nonspontaneous object to a spontaneous one
  • From a hotter object to a colder one (correct)

    • Which type of reaction is characterized by a negative ΔH value?

  • Nonspontaneous reaction
  • Endothermic reaction
  • Exothermic reaction (correct)
  • Spontaneous reaction

    • Which best describes the significance of the Second Law of Thermodynamics in chemical processes?

    <p>Prevents reversibility of reactions</p> Signup and view all the answers

    What is the effect of a negative ΔG value on a chemical reaction?

    <p>Favors spontaneity</p> Signup and view all the answers

    In which type of reaction is heat absorbed from the surroundings?

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

    What happens if ΔG is less than 0?

    <p>The reaction is spontaneous in the forward direction.</p> Signup and view all the answers

    In which direction does a reaction proceed if ΔG is greater than 0?

    <p>The reaction is spontaneous in the opposite direction.</p> Signup and view all the answers

    What do negative values of ΔH indicate about a reaction?

    <p>The reaction is exothermic.</p> Signup and view all the answers

    If a reaction has positive ΔS, what does it imply?

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

    What can you conclude about a system when ΔG = 0?

    <p>The system is at equilibrium.</p> Signup and view all the answers

    How can you describe a reaction with ΔG < 0?

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

    What is the standard entropy change for the reaction 2NH3(g) ⟶ NH2CONH2(aq) + H2O(l) at 25°C?

    <p>1.5 J/K</p> Signup and view all the answers

    For an endothermic reaction, what can be said about the relationship between ΔH, ΔS, and ΔG?

    <p>ΔH &lt; 0, ΔS &lt; 0, ΔG &gt; 0</p> Signup and view all the answers

    What does a negative value of ΔSuniv indicate regarding spontaneity?

    <p>The process requires more energy</p> Signup and view all the answers

    In which scenario would Gibbs’ free energy (ΔG) be negative?

    <p>ΔH &lt; 0 and TΔS &lt; ΔH</p> Signup and view all the answers

    If a reaction has a positive value for ΔSsys, what can be concluded about the surroundings' entropy change (ΔSsurr)?

    <p>It must be negative</p> Signup and view all the answers

    For an exothermic reaction, what happens to the system's entropy (ΔSsys) and the overall entropy change (ΔSuniv)?

    <p>Both ΔSsys and ΔSuniv increase</p> Signup and view all the answers

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