Thermodynamics: Specific Heat Capacity
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Questions and Answers

What is the unit of the latent heat of fusion?

  • kcal/kg°C (correct)
  • joules/kg
  • joules/kg°C
  • kcal/kg

    • If 1 calorie is equal to 4.186 joules, how many joules are in 5 calories?

  • 20.93 kJ (correct)
  • 20.93 kcal
  • 20.93 joules
  • 21.04 joules

    • What is the specific heat capacity of air?

  • 1.047 kJ/kg°C
  • 0.25 kcal/kgK
  • 0.25 kcal/kg°C (correct)
  • 1047 J/kg°C (correct)

    • If ΔT = 10°C, what is the change in temperature in Kelvin?

    <p>10 K</p> Signup and view all the answers

    What is the unit of Q, the energy transferred as heat?

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

    What is the primary mechanism of convection?

    <p>Mechanical transfer of molecules</p> Signup and view all the answers

    What type of substances can convection occur in?

    <p>Liquids and gases</p> Signup and view all the answers

    What drives the movement of molecules in convection?

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

    What is the main difference between convection and diffusion?

    <p>Convection involves bulk movement, diffusion involves individual molecules</p> Signup and view all the answers

    What is an example of convection in everyday life?

    <p>Heating a pot of water on a stove</p> Signup and view all the answers

    What is the energy required to change 0.05 kg of steam to liquid?

    <p>113000 J</p> Signup and view all the answers

    Which transition liberates more heat, steam to liquid or liquid to ice?

    <p>Steam to liquid</p> Signup and view all the answers

    What is the energy required to change 0.05 kg of liquid to ice?

    <p>2260 kJ</p> Signup and view all the answers

    What is the ratio of the energy required to change 0.05 kg of steam to liquid to the energy required to change 0.05 kg of liquid to ice?

    <p>6.75:1</p> Signup and view all the answers

    Which of the following statements is true about the steam to liquid and liquid to ice transitions?

    <p>The steam to liquid transition requires more energy than the liquid to ice transition</p> Signup and view all the answers

    What is the specific heat capacity of lead in J.Kg-1.oC-1?

    <p>130 J.Kg-1.oC-1</p> Signup and view all the answers

    What is the unit of specific heat capacity?

    <p>kcal.Kg-1.oC-1</p> Signup and view all the answers

    How much thermal energy is needed to increase the temperature of 200 g of water by 5 oC?

    <p>12540 J</p> Signup and view all the answers

    What would be the temperature change if 1046 J of thermal energy is added to 200 g of lead?

    <p>6 oC</p> Signup and view all the answers

    If the specific heat capacity of water is 1 kcal.Kg-1.oC-1, what is its value in J.Kg-1.oC-1?

    <p>4180 J.Kg-1.oC-1</p> Signup and view all the answers

    What is the total energy transferred as heat proportional to?

    <p>The total number of molecules N</p> Signup and view all the answers

    What is the average kinetic energy per molecule a measure of?

    <p>The temperature of the system</p> Signup and view all the answers

    What is the sum of the average kinetic energy per molecule times the total number of molecules N equivalent to?

    <p>The total energy transferred as heat</p> Signup and view all the answers

    What is the physical quantity that is directly proportional to the total number of molecules N?

    <p>The total energy transferred as heat</p> Signup and view all the answers

    What is the relationship between the average kinetic energy per molecule and the temperature of the system?

    <p>The average kinetic energy per molecule is directly proportional to the temperature of the system</p> Signup and view all the answers

    Study Notes

    Units and Conversions

    • Q is measured in kilocalories (kcal)
    • C is measured in joules per kilogram per kelvin (joules/Kg/K) or kilocalories per kilogram per degree Celsius (kcal/Kg/°C)
    • m is measured in kilograms (kg)
    • ΔT is measured in kelvin (K) or degrees Celsius (°C)
    • 1 Calorie is equal to 4.186 joules

    Specific Heat Capacities

    • Air: c = 0.25 kcal/Kg/°C = 1047 J/Kg/°C
    • Water: c = 1 kcal/Kg/°C = 4186 J/Kg/°C
    • Lead: c = 0.03 kcal/Kg/°C = 130 J/Kg/°C

    Latent Heat

    • Latent heat of vaporization of water (Lv) = 2260 kJ/kg
    • Latent heat of fusion of water (Lf) = 335 kJ/kg

    Example Problems

    • To increase the temperature of 200 g of water by 5°C, Q = ?
    • Q = m × c × ΔT
    • For liquid to ice transition, Q = m × Lf
    • For steam to liquid transition, Q = m × Lv

    Convection

    • Convection is the mechanical transfer of hot molecules in a gas or liquid from one place to another
    • The sum of kinetic energy per molecule is equal to the average kinetic energy per molecule times the total number of molecules (N)

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    Description

    Quiz on thermodynamics concepts including specific heat capacity, units of measurement, and conversion between calories and joules. Test your understanding of heat transfer and temperature changes.

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