Chapter 9: Thermochemistry Energy Notes
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Questions and Answers

What is the enthalpy of fusion for the plateaus described?

  • $-96.6 \text{ kJ/mol}$
  • $-16.2 \text{ kJ/mol}$
  • $40.67 \text{ kJ/mol}$
  • $6.01 \text{ kJ/mol}$ (correct)
  • What is the purpose of Hess's Law, as described in the text?

  • To relate the enthalpies of formation of products and reactants
  • To calculate the enthalpy of vaporization for a substance
  • To calculate the amount of heat needed to move across temperature plateaus
  • To determine the enthalpy change for a reaction, regardless of the number of steps (correct)
  • What is the enthalpy change, $\Delta H_{rxn}$, for the reaction: $\text{Ca}^{2+}(\text{aq}) + 2 \text{OH}^{-}(\text{aq}) + \text{CO}{2}(\text{g}) \to \text{CaCO}{3}(\text{s}) + \text{H}_{2}\text{O}(\text{l})$?

  • $-16.2 \text{ kJ/mol}$
  • $-96.6 \text{ kJ/mol}$ (correct)
  • $-65.3 \text{ kJ/mol}$
  • $+178.1 \text{ kJ/mol}$
  • What is the enthalpy change, $\Delta H_{rxn}$, for the reaction: $2 \text{HCl}(\text{g}) + \text{F}{2}(\text{g}) \to 2 \text{HF}(\text{l}) + \text{Cl}{2}(\text{g})$?

    <p>$-1015.4 \text{ kJ/mol}$</p> Signup and view all the answers

    What is the enthalpy change, $\Delta H_{rxn}$, for the reaction: $\text{C}(\text{s}) + \text{O}{2}(\text{g}) \to \text{CO}{2}(\text{g})$?

    <p>$-393.5 \text{ kJ/mol}$</p> Signup and view all the answers

    What is the purpose of the $\Delta H_{fusion}$ and $\Delta H_{vap}$ constants mentioned in the text?

    <p>To calculate the amount of heat needed to move across temperature plateaus</p> Signup and view all the answers

    What is the First Law of Thermodynamics?

    <p>The total internal energy of an isolated system is constant.</p> Signup and view all the answers

    Which of the following is NOT a form of energy?

    <p>Absolute energy</p> Signup and view all the answers

    If a system is isolated, what can be said about its internal energy?

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

    Which of the following is a state function?

    <p>Internal energy</p> Signup and view all the answers

    In the context of thermodynamics, what is the surroundings?

    <p>The region outside the system.</p> Signup and view all the answers

    What is the relationship between heat and work in an isolated system?

    <p>Heat and work can be interchanged.</p> Signup and view all the answers

    What is the relationship between the change in internal energy, $\Delta E$, and the heat transferred, $q$, and work done, $w$, on a system?

    <p>$\Delta E = q + w$</p> Signup and view all the answers

    Which of the following is NOT a state function?

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

    If a system undergoes a change at constant volume, how is the change in internal energy, $\Delta E$, related to the heat transferred, $q_V$?

    <p>$\Delta E = q_V$</p> Signup and view all the answers

    Which of the following is NOT a component of the universe in the context of thermodynamics?

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

    If a system undergoes a change at constant pressure, how is the change in enthalpy, $\Delta H$, related to the change in internal energy, $\Delta E$, and the work done by the system, $w_P$?

    <p>$\Delta H = \Delta E + w_P$</p> Signup and view all the answers

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