Thermodynamics
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Questions and Answers

What is the relation between entropy and thermodynamic probability?

  • S = k/W
  • S = W/k
  • S = 2.303 k/W
  • S = k log e W (correct)

    • Which process will be spontaneous if the total entropy increases?

  • Exothermic reaction
  • Isothermal process
  • Endothermic reaction
  • Adiabatic expansion (correct)

    • What is the entropy change during an isothermal process?

  • ΔS = 0
  • ΔS = nR ln V
  • ΔS = nCp ln T
  • ΔS = nR ln 2 (correct)

    • What happens to the entropy of the surroundings in an exothermic process?

    <p>It increases</p> Signup and view all the answers

    What is the unit of entropy?

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

    What is the characteristic of a reversible adiabatic process?

    <p>ΔS = 0</p> Signup and view all the answers

    Who demonstrated the maximum convertibility of heat into work using an imaginary reversible cycle?

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

    What is the entropy change during a phase transition, such as melting or boiling?

    <p>It is accompanied by an increase in entropy</p> Signup and view all the answers

    What is the unit of entropy?

    <p>JK⁻¹</p> Signup and view all the answers

    What is entropy a measure of?

    <p>The randomness or disorder of the molecules of the system</p> Signup and view all the answers

    What is the unit of entropy?

    <p>Joules per kelvin (J/K)</p> Signup and view all the answers

    What is the essential condition for a cyclic process?

    <p>Net work done is equal to heat absorbed</p> Signup and view all the answers

    What is the expression for the free energy change of a system?

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

    What is Clausius' statement about heat transfer?

    <p>Heat cannot pass from a colder body to a hotter body</p> Signup and view all the answers

    What is the Gibbs free energy of a system a measure of?

    <p>The maximum useful work done by a system</p> Signup and view all the answers

    What is the entropy change of fusion, ΔSf, given by?

    <p>ΔSf = ΔHf / Tf</p> Signup and view all the answers

    What is entropy an example of?

    <p>Extensive property</p> Signup and view all the answers

    What is the characteristic of a phase transition?

    <p>It occurs at a definite temperature</p> Signup and view all the answers

    What is the result of heat transfer in an exothermic process on the entropy of the surroundings?

    <p>Entropy of the surroundings increases</p> Signup and view all the answers

    What is the relationship between entropy and disorder in a system?

    <p>Entropy is directly proportional to disorder</p> Signup and view all the answers

    What is the characteristic of an isothermal process?

    <p>Temperature remains constant</p> Signup and view all the answers

    What is the expression for entropy change in an isobaric process?

    <p>ΔS = nCp ln(T2/T1)</p> Signup and view all the answers

    What is the entropy change during an adiabatic expansion?

    <p>ΔS = 0</p> Signup and view all the answers

    What is the relationship between entropy and thermodynamic probability?

    <p>S = k log e W</p> Signup and view all the answers

    During a phase transition at a definite temperature, what is the direction of heat transfer?

    <p>Heat is always absorbed by the system</p> Signup and view all the answers

    What is the correct expression for the entropy change during a phase transition?

    <p>ΔS = ΔH / T</p> Signup and view all the answers

    Which of the following is a characteristic of a reversible reaction at constant temperature and pressure?

    <p>Maximum work done is equal to the free energy change</p> Signup and view all the answers

    What is the effect of an increase in entropy on the spontaneity of a process?

    <p>The process becomes more spontaneous</p> Signup and view all the answers

    During a phase transition, what is the relation between the entropy change and the latent heat?

    <p>Entropy change is directly proportional to the latent heat</p> Signup and view all the answers

    What is the significance of the Gibbs free energy change in a reversible reaction?

    <p>It is a measure of the maximum work done</p> Signup and view all the answers

    What is implied by Clausius' statement about heat transfer?

    <p>Heat cannot pass spontaneously from a colder body to a hotter body.</p> Signup and view all the answers

    What is the primary purpose of the Carnot cycle?

    <p>To demonstrate the maximum convertibility of heat into work.</p> Signup and view all the answers

    What is a characteristic of entropy that is relevant to its measurement?

    <p>It is an extensive property.</p> Signup and view all the answers

    What is the significance of the Carnot cycle in understanding entropy?

    <p>It provides a theoretical framework for understanding entropy.</p> Signup and view all the answers

    What is implied by the concept of entropy as a measure of randomness or disorder?

    <p>Disorder is a more probable state than order.</p> Signup and view all the answers

    What is the relevance of temperature to the concept of entropy?

    <p>Entropy is measured per unit temperature, in JK⁻¹.</p> Signup and view all the answers

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