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 (D)</p> Signup and view all the answers

What is the unit of entropy?

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

What is the characteristic of a reversible adiabatic process?

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

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

<p>Carnot (D)</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 (B)</p> Signup and view all the answers

What is the unit of entropy?

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

What is entropy a measure of?

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

What is the unit of entropy?

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

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

<p>ΔG = ΔH - TΔS (C)</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 (A)</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 (B)</p> Signup and view all the answers

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

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

What is entropy an example of?

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

What is the characteristic of a phase transition?

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

What is the characteristic of an isothermal process?

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

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

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

What is the entropy change during an adiabatic expansion?

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

What is the relationship between entropy and thermodynamic probability?

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

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

<p>ΔS = ΔH / T (A)</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 (C)</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 (D)</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 (B)</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 (B)</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. (B)</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. (C)</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. (D)</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. (D)</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. (B)</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. (B)</p> Signup and view all the answers

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