Podcast
Questions and Answers
What is the unit of the latent heat of fusion?
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?
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?
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?
If ΔT = 10°C, what is the change in temperature in Kelvin?
What is the unit of Q, the energy transferred as heat?
What is the unit of Q, the energy transferred as heat?
What is the primary mechanism of convection?
What is the primary mechanism of convection?
What type of substances can convection occur in?
What type of substances can convection occur in?
What drives the movement of molecules in convection?
What drives the movement of molecules in convection?
What is the main difference between convection and diffusion?
What is the main difference between convection and diffusion?
What is an example of convection in everyday life?
What is an example of convection in everyday life?
What is the energy required to change 0.05 kg of steam to liquid?
What is the energy required to change 0.05 kg of steam to liquid?
Which transition liberates more heat, steam to liquid or liquid to ice?
Which transition liberates more heat, steam to liquid or liquid to ice?
What is the energy required to change 0.05 kg of liquid to ice?
What is the energy required to change 0.05 kg of liquid to ice?
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?
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?
Which of the following statements is true about the steam to liquid and liquid to ice transitions?
Which of the following statements is true about the steam to liquid and liquid to ice transitions?
What is the specific heat capacity of lead in J.Kg-1.oC-1?
What is the specific heat capacity of lead in J.Kg-1.oC-1?
What is the unit of specific heat capacity?
What is the unit of specific heat capacity?
How much thermal energy is needed to increase the temperature of 200 g of water by 5 oC?
How much thermal energy is needed to increase the temperature of 200 g of water by 5 oC?
What would be the temperature change if 1046 J of thermal energy is added to 200 g of lead?
What would be the temperature change if 1046 J of thermal energy is added to 200 g of lead?
If the specific heat capacity of water is 1 kcal.Kg-1.oC-1, what is its value in J.Kg-1.oC-1?
If the specific heat capacity of water is 1 kcal.Kg-1.oC-1, what is its value in J.Kg-1.oC-1?
What is the total energy transferred as heat proportional to?
What is the total energy transferred as heat proportional to?
What is the average kinetic energy per molecule a measure of?
What is the average kinetic energy per molecule a measure of?
What is the sum of the average kinetic energy per molecule times the total number of molecules N equivalent to?
What is the sum of the average kinetic energy per molecule times the total number of molecules N equivalent to?
What is the physical quantity that is directly proportional to the total number of molecules N?
What is the physical quantity that is directly proportional to the total number of molecules N?
What is the relationship between the average kinetic energy per molecule and the temperature of the system?
What is the relationship between the average kinetic energy per molecule and the temperature of the system?
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.
