Podcast Beta
Questions and Answers
What is the unit of the latent heat of fusion?
If 1 calorie is equal to 4.186 joules, how many joules are in 5 calories?
What is the specific heat capacity of air?
If ΔT = 10°C, what is the change in temperature in Kelvin?
Signup and view all the answers
What is the unit of Q, the energy transferred as heat?
Signup and view all the answers
What is the primary mechanism of convection?
Signup and view all the answers
What type of substances can convection occur in?
Signup and view all the answers
What drives the movement of molecules in convection?
Signup and view all the answers
What is the main difference between convection and diffusion?
Signup and view all the answers
What is an example of convection in everyday life?
Signup and view all the answers
What is the energy required to change 0.05 kg of steam to liquid?
Signup and view all the answers
Which transition liberates more heat, steam to liquid or liquid to ice?
Signup and view all the answers
What is the energy required to change 0.05 kg of liquid to ice?
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?
Signup and view all the answers
Which of the following statements is true about the steam to liquid and liquid to ice transitions?
Signup and view all the answers
What is the specific heat capacity of lead in J.Kg-1.oC-1?
Signup and view all the answers
What is the unit of specific heat capacity?
Signup and view all the answers
How much thermal energy is needed to increase the temperature of 200 g of water by 5 oC?
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?
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?
Signup and view all the answers
What is the total energy transferred as heat proportional to?
Signup and view all the answers
What is the average kinetic energy per molecule a measure of?
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?
Signup and view all the answers
What is the physical quantity that is directly proportional to the total number of molecules N?
Signup and view all the answers
What is the relationship between the average kinetic energy per molecule and the temperature of the system?
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)
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
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.
