1. 14.7 Thermal Energy - Review

2. Explain the difference between a renewable and non-renewable resource.
A resource that can be replaced in a relatively short period of time
Non-Renewable
Exist in limited quantities and once used cannot be replaced.

3. Explain the difference between a renewable and non-renewable resources
a.) List the non-renewable resources
Oil, natural gas, coal and uranium
b.) List renewable resources
Solar, wind, hydroelectric, geothermal, biomass

4. What is solar energy?
Energy that turns the heat from the sun into electric energy

5. What is Geothermal Energy?
Energy that turns the heat in the earth into electric energy

6. What is the Hydroelectric Energy
Energy that turns flowing water in kinetic energy and the into electric energy

7. What is Heat?
Transfer of thermal energy from one object to another because of temperature difference.

8. What is Temperature
Measure of how hot or cold an object is compared to a reference.

9. Heat flows from _____ to _________
Hot
Cold

10. Define the units we use to measure temperature.
Celsius

11. Describe the movement of particles in a sold, a liquid and a gas.
Solids
Liquids
Gas
Which state would have the most heat and the highest temperature
Slow
Medium
Fast
Gas

12. Explain how a balloon would behave if you warmed up the air inside of it by a fire.
The balloon would expand if placed near a fire
What about if you put it in a freezer?
The balloon would shrink if placed in a freezer
What is the process called?
Thermal Expansion

13. What three things does thermal energy depend on?
Mass
Temperature
Phase (solid, liquid, or gas)

14. What is specific heat?
The amount of heat needed to raise the temperature of 1 gram of a material by 1º C.

15. What is the equation for heat?
Q = m · c ∙ Δt
Q = heat (J)
m = mass (g)
c = specific heat of substance (J/(g·Cº)
ΔT = change in temperature (C°)

16. If the specific heat of iron is
If the specific heat of iron is .449 J/gC and a 300 gram piece of iron is heated from º Celsius then what would be the amount of heat transferred?
Q = m · c ∙ Δt
Q = 300 g · J/(g·Cº) ∙ (50ºC - 25ºC)
Q = 3,367.5 J

17. Define Conduction
Transfer of thermal energy by objects touching.

18. Define Convection
Transfer of thermal energy when particles of a fluid move from one place to another.

19. Define Radiation
Transfer of energy by waves moving through space.

20. Name a good thermal conductor
Copper, silver, aluminum, iron, steel, brass, bronze, mercury, dirty water

21. Name a good thermal insulator
Glass, rubber, fiberglass, cotton, paper, wood, plastic, air, pure water

22. What does the 1st Law of Thermodynamics state?
Energy is conserved.

23. What does the 2nd Law of Thermodynamics state?
Thermal energy can flow from colder objects to hotter objects ONLY if work is done on the system.

24. What does the 3rd Law of Thermodynamics state?
Absolute Zero cannot be reached.

25. What is the value of Absolute Zero?ºC ºF