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Metallurgical Thermodynamics

This quiz covers fundamental thermodynamic principles relevant to metallurgy, including thermodynamic systems, laws of thermodynamics, Gibbs free energy, equilibrium constants, Van't Hoff equation, Ellingham diagrams, and Pourbaix diagrams.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is NOT a type of thermodynamic system?

  1. Open system
  2. Closed system
  3. Isolated system
  4. Equilibrium system
Question 2 Multiple Choice (Single Answer)

The first law of thermodynamics states that:

  1. Energy can be created or destroyed.
  2. Energy can be transferred from one form to another.
  3. Energy can be stored in a system.
  4. All of the above
Question 3 Multiple Choice (Single Answer)

The second law of thermodynamics states that:

  1. The entropy of an isolated system always increases.
  2. The entropy of a closed system always decreases.
  3. The entropy of an open system always increases.
  4. The entropy of a system can never decrease.
Question 4 Multiple Choice (Single Answer)

The Gibbs free energy of a system is defined as:

  1. G = H - TS
  2. G = U + TS
  3. G = H + TS
  4. G = U - TS
Question 5 Multiple Choice (Single Answer)

The equilibrium constant for a chemical reaction is:

  1. The ratio of the concentrations of the reactants to the concentrations of the products.
  2. The ratio of the activities of the reactants to the activities of the products.
  3. The ratio of the partial pressures of the reactants to the partial pressures of the products.
  4. All of the above
Question 6 Multiple Choice (Single Answer)

The Van't Hoff equation relates:

  1. The equilibrium constant of a reaction to the temperature.
  2. The enthalpy of a reaction to the temperature.
  3. The entropy of a reaction to the temperature.
  4. The Gibbs free energy of a reaction to the temperature.
Question 7 Multiple Choice (Single Answer)

The Ellingham diagram is a plot of:

  1. The Gibbs free energy of formation of oxides as a function of temperature.
  2. The enthalpy of formation of oxides as a function of temperature.
  3. The entropy of formation of oxides as a function of temperature.
  4. The equilibrium constant for the formation of oxides as a function of temperature.
Question 8 Multiple Choice (Single Answer)

The Pourbaix diagram is a plot of:

  1. The equilibrium potential of a metal as a function of pH.
  2. The corrosion rate of a metal as a function of pH.
  3. The passivation potential of a metal as a function of pH.
  4. All of the above
Question 9 Multiple Choice (Single Answer)

The free energy change of a reaction is:

  1. The difference between the enthalpy and entropy changes of the reaction.
  2. The difference between the enthalpy and temperature changes of the reaction.
  3. The difference between the entropy and temperature changes of the reaction.
  4. The difference between the enthalpy and Gibbs free energy changes of the reaction.
Question 10 Multiple Choice (Single Answer)

The enthalpy of a reaction is:

  1. The heat absorbed or released by the reaction at constant pressure.
  2. The heat absorbed or released by the reaction at constant volume.
  3. The work done by the reaction at constant pressure.
  4. The work done by the reaction at constant volume.
Question 11 Multiple Choice (Single Answer)

The entropy of a reaction is:

  1. The change in the disorder of the system during the reaction.
  2. The change in the energy of the system during the reaction.
  3. The change in the volume of the system during the reaction.
  4. The change in the pressure of the system during the reaction.
Question 12 Multiple Choice (Single Answer)

The Gibbs free energy of a reaction is:

  1. The maximum amount of work that can be obtained from the reaction.
  2. The minimum amount of work that must be done to carry out the reaction.
  3. The difference between the enthalpy and entropy changes of the reaction.
  4. The difference between the enthalpy and Gibbs free energy changes of the reaction.
Question 13 Multiple Choice (Single Answer)

The equilibrium constant for a reaction is:

  1. The ratio of the concentrations of the reactants to the concentrations of the products.
  2. The ratio of the activities of the reactants to the activities of the products.
  3. The ratio of the partial pressures of the reactants to the partial pressures of the products.
  4. All of the above
Question 14 Multiple Choice (Single Answer)

The Van't Hoff equation relates:

  1. The equilibrium constant of a reaction to the temperature.
  2. The enthalpy of a reaction to the temperature.
  3. The entropy of a reaction to the temperature.
  4. The Gibbs free energy of a reaction to the temperature.
Question 15 Multiple Choice (Single Answer)

The Ellingham diagram is a plot of:

  1. The Gibbs free energy of formation of oxides as a function of temperature.
  2. The enthalpy of formation of oxides as a function of temperature.
  3. The entropy of formation of oxides as a function of temperature.
  4. The equilibrium constant for the formation of oxides as a function of temperature.
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