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16.8 Thermal Energy - Review
"By failing to prepare, you are preparing to fail.”
Benjamin Franklin
Transfer of thermal energy from one object to another because of temperature difference.
Measure of how hot or cold an object is compared to a reference point.
Hot Cold
Celsius
I. Solids II. Liquids III. Gas IV. Which state would have the most heat and the highest
energy
Slow Medium Fast
Gas
ii. What about if you put it in a freezer?
iii. What is the process called?
The balloon would expand if placed near a fire
The balloon would shrink if placed in a freezer
Thermal Expansion
i. You warmed up the air inside of the balloon by a fire?
i. Mass ii. Temperature iii. Phase (solid, liquid, or gas)
The amount of heat needed to raise the temperature of 1 gram of a material by 1º C.
Q = m · c · Δt
Q = m · c · Δt Q = 300 g · 0.449 J/(g·Cº) · (50ºC - 25ºC) Q = 3,367.5 J
Transfer of thermal energy by objects touching.
Transfer of thermal energy when particles of a fluid move from one place to another.
Transfer of thermal energy by waves moving through space.
Copper, silver, aluminum, iron, steel, brass, bronze, mercury, dirty water
Glass, rubber, fiberglass, cotton, paper, wood, plastic, air, pure water
Energy is conserved.
Thermal energy can flow from colder objects to hotter objects ONLY if work is done on the system.
Absolute Zero cannot be reached.
-273 ºC -459 ºF
From section A to B: From section B to C: From section C to D: From section D to E: From section E to F: From section E to D: From section C to B:
A solid rising in temperature Phase change: Melting A liquid rising in temperature Phase change: Evaporation A gas rising in temperature Condensation Freezing
From section A to B: Potential Energy: Kinetic Energy:
From section B to C: Potential Energy:
Kinetic Energy: From section C to D: Potential Energy:
Kinetic Energy: From section D to E: Potential Energy:
Kinetic Energy:
Stays the same Increasing Increasing Stays the same Stays the Same Increasing Increasing Stays the Same
From section E to F: Potential Energy: Kinetic Energy:
From section E to D: Potential Energy:
Kinetic Energy: From section C to B: Potential Energy:
Kinetic Energy:
Stays the Same Increasing Decreasing Stays the same Decreasing Stays the same
0 ºC 32 ºF
100 ºC 212 ºF
Melting: the change from ______________ to _______________. Freezing: the change from _____________ to ________________. Evaporation: the change from _____________ to _____________. Condensation: the change from ___________ to _____________.
solid liquid
liquid solid
liquid gas
gas liquid
Sublimation: the change from ___________ to ____________. Deposition: the change from ___________ to ______________.
solid gas
gas solid
Which of these three substances below was likely used in this phase change experiment?
Substance Melting point Boiling point Bolognium 20 °C 100 °C
Unobtainium 40 °C 140 °C Foosium 70 °C 140 °C
Melting
Freezing
SublimationDeposition Condensation
Evaporation
Freezing
Thermal Energy
Melting
Condensation
Evaporation
76 Questions!!!!!! ¡ 152 Possible Points ¡ 5 True/False ¡ 10 Matching ¡ 56 Multiple Choice ¡ 5 questions from previous section (Energy)
¡ Any Questions!!!! ¡ Good Luck and Study !!