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Thermo practice

Quiz by Natalie Wieland

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13 questions
Show answers
  • Q1
    The standard enthalpy of formation for nitrogen dioxide is the enthalpy change of the reaction
    1/2N2(g) + O2(g) --> NO2(g)
    N2(g) + 2O2(g) --> N2O4(g)
    NO(g) + 1/2O2(g) --> NO2(g)
    N2(g) +2O2(g) --> 2NO2(g)
    60s
  • Q2
    Which of the following has a non-zero standard enthalpy of formation?
    H2O(l)
    Hg(l)
    N2(g)
    Na(s)
    60s
  • Q3
    For endothermic reactions at constant pressure
    dH>0
    dH<0
    dS>0
    S<0
    60s
  • Q4
    At a certain temperature C(s) + O2(g) --> CO2(g) has a dG of -339.4 kJ/mol. This means that at this temperature
    the system is at equilibrium
    the system will not react
    this system has a high reaction rate
    gaseous carbon dioxide spontaneously forms
    60s
  • Q5
    Which processes are spontaneous at all temperatures?
    dH (+) and dS (-)
    dH (+) and dH (+)
    dH (-) and dS (-)
    dH (-) and dS (+)
    60s
  • Q6
    The process which is nonspontaneous at all values of temperature is
    dH (+) and dS (+)
    dH (-) and dS (+)
    dH (-) and dS (-)
    dH (+) and dS (-)
    60s
  • Q7
    Which of these four processes is improbable at a low temperature but becomes more probable as the temperature rises?
    dH (+) and dS (+)
    dH (-) and dS (-)
    dH (-) and dS (+)
    dH (+) and dS (-)
    60s
  • Q8
    In which of the following four processes is there an increase in entropy?
    2SO2(g) + O2(g) --> SO3(g)
    H2O2(l) --> H2O(l) + 1/2 O2(g)
    Hg(g) --> Hg(l)
    H2O(g) --> H2O(s)
    60s
  • Q9
    What is the enthalpy change for the following reaction under standard conditions? CS2(l) + 3O2(g) --> CO2(g) + 2SO2(g), dHf CS2(l) = +88 kJ/mol, dHf CO2(g) = -394 kJ/mol, dHf SO2(g) = -297 kJ/mol
    -779 kJ
    -1076 kJ
    -603 kJ
    -900 kJ
    120s
  • Q10
    A reaction takes place within a system. As a result, the entropy of the system decreases. Which of the following statements MUST be true?
    The entropy of the surroundings increases
    The entropy of the universe decreases
    The reaction is endothermic
    The Gibbs free energy of the system increases
    60s
  • Q11
    When propane burns in air, heat is released: C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O (g). What are the signs of H, S, and G (respectively) for this process as illustrated by the above equation
    - - +
    + + -
    - + -
    - + +
    60s
  • Q12
    Electrolysis of water is a chemical change because
    hydrogen bonds are broken
    bonds between H atoms and O atoms in individual molecules are broken
    the phase changes from liquid water to gaseous hydrogen and oxygen
    a great deal of energy is required
    60s
  • Q13
    Gas A2 reacts with gas B2 to form gas AB at constant temperature. The bond energy of AB is much greater than that of either reactant. For this process, what are the signs of dH and Ssurr?
    + -
    - +
    + +
    - -
    60s

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