Chemistry Quiz: Enthalpy and Real Gases
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Questions and Answers

What does the heat of sublimation involve?

  • The change in phase from liquid to gas
  • The energy released in a chemical reaction
  • The change in phase from solid to gas (correct)
  • The change in phase from solid to liquid

    • How is a specific property defined?

  • Is an extensive property multiplied by mass
  • Defines a specific variable (e.g., temperature) (correct)
  • Is independent of mass
  • Is dependent on the phase of the substance

    • What is the definition of a material's specific heat?

  • The ratio of heat required to change the temperature of mass by a change in temperature (correct)
  • Being different for constant pressure and constant temperature processes
  • A function of temperature
  • All of the above

    • What do properties having to do with equilibrium conditions, such as Gibbs and Helmholtz functions, refer to?

    <p>Properties having to do with equilibrium conditions, such as the Gibbs and Helmholtz functions</p> Signup and view all the answers

    In a saturated vapor, what is the relationship between temperature and pressure?

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

    How are properties of a superheated vapor characterized?

    <p>Properties beyond those of a saturated vapor</p> Signup and view all the answers

    What is the best definition of enthalpy?

    <p>The amount of useful energy in a system</p> Signup and view all the answers

    Which statement is not true for real gases?

    <p>Real gases are found only rarely in nature</p> Signup and view all the answers

    When is the stagnation state called the isentropic stagnation state?

    <p>Reversible as well as adiabatic</p> Signup and view all the answers

    During which process does the entropy of a fluid remain constant?

    <p>Isentropic stagnation process</p> Signup and view all the answers

    Which of the following processes is irreversible?

    <p>An isentropic deceleration of a moving perfect fluid</p> Signup and view all the answers

    What does the heat of vaporization involve?

    <p>The change in phase liquid to gas</p> Signup and view all the answers

    What happens during the stagnation process in fluid mechanics?

    <p>Increase in temperature and pressure</p> Signup and view all the answers

    What is a system composed of ice and water at 0°C said to be?

    <p>In thermodynamic equilibrium</p> Signup and view all the answers

    Which term is used to describe the properties of a fluid at the stagnation state?

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

    When does a liquid boil?

    <p>When its vapor pressure equals the ambient pressure</p> Signup and view all the answers

    Which of the following is NOT considered a thermodynamic property?

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

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