Thermal Properties: Heat Capacity Quiz
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Questions and Answers

Which of the following is a measure of the energy required to produce a unit rise in temperature for one mole of a material?

  • Heat capacity (correct)
  • Thermal conductivity
  • Thermal shock resistance
  • Thermal expansion
  • How does heat capacity at constant pressure (Cp) usually compare to heat capacity at constant volume (Cv)?

  • Cp is usually less than Cv
  • Cp is equal to Cv
  • Cp is usually greater than Cv (correct)
  • Cp and Cv are not related to each other
  • What is the limiting value of heat capacity for solids?

  • $2R$
  • $5R$
  • $3R$ (correct)
  • $4R$
  • What happens to the heat capacity with increasing temperature for solids?

    <p>It increases</p> Signup and view all the answers

    What is the Debye temperature typically less than?

    <p>Room temperature</p> Signup and view all the answers

    What type of energy is stored as atomic vibrations, leading to an increase in heat capacity with temperature?

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

    Which type of material generally has a larger specific heat (cp)?

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

    What causes polymers to have larger linear coefficient of thermal expansion (α) values?

    <p>Strong secondary bonds</p> Signup and view all the answers

    Which material has the highest thermal conductivity (k)?

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

    What type of energy transfer mechanism is responsible for the low thermal conductivity of polymers?

    <p>Vibration/rotation of chain molecules</p> Signup and view all the answers

    Why do materials experience thermal stresses?

    <p>Restrained thermal expansion/contraction</p> Signup and view all the answers

    What type of curve represents thermal expansion with an increase in interatomic separation?

    <p>Asymmetric curve</p> Signup and view all the answers

    Which material has the smallest linear coefficient of thermal expansion (α) value?

    <p>Silica (cryst. SiO2)</p> Signup and view all the answers

    What is the main reason for the larger specific heat (cp) of polymers compared to metals and ceramics?

    <p>Weak secondary bonds</p> Signup and view all the answers

    What is the reason for the low thermal conductivity (k) of polymers?

    <p>Vibration/rotation of chain molecules</p> Signup and view all the answers

    Which type of material generally has a smaller linear coefficient of thermal expansion (α) value?

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

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