topic : chemistry
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Topic : Chemistry Aim : Explain the different types of phase changes and the energy changes involved. Do Now: ON NOTES SHEET HW: Ditto – Periodic Tables Families Review (last page of Periodic Table Notes Packet). http://www.youtube.com/watch?v=XaDxwe8l3us&feature=related. Phase Changes. - PowerPoint PPT PresentationTRANSCRIPT
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Topic: Chemistry
Aim: Explain the different types of phase changes and the energy changes involved.
Do Now: ON NOTES SHEET
HW: Ditto – Periodic Tables Families Review (last page of Periodic Table Notes Packet)
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http://www.youtube.com/watch?v=XaDxwe8l3us&feature=related
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Phase Changes
• Involves the absorption OR release of heat (energy).
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Substance absorbs heat energy
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Melting • Solid liquid
• Solid ABSORBS heat energy
Substance absorbs heat energy
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Melting points of different substances• Iron: 1536ºC• Gold: 1063ºC• Glucose: 150ºC• Urea: 132-134ºC
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Vaporization • Liquid gas
• Liquid ABSORBS heat energy
• When it occurs on surface of liquid: evaporation
LIQUID
GASLiquid absorbs heat energy
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Boiling points of different substances• Alcohol (Ethanol): 79ºC• Iodine: 184.3ºC• Mercury: 356.9ºC• Olive oil: 300ºC• Jet fuel: 163ºC
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Condensation • Gas liquid
• Gas LOSES heat energy
LIQUID
GASGas loses heat energy
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Freezing • Liquid solid
• Liquid LOSES heat energy
Substance loses heat energy
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Sublimation • Solid Gas
• No liquid phase
• Ex: dry ice
Solid
GASSolid absorbs heat energy
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Moth balls commonly undergo the process of sublimation. Sublimation is the process in which a solid changes directly to its gaseous phase, skipping the liquid phase.
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And an animation of the phase changes of water
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Let’s summarize…
1. List the different types of phase changes.
2. Explain what happens to heat energy in each phase change.
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1. When a liquid becomes a solid, energy
1. does not change
2. is released
3. is absorbed
4. is first absorbed, then released
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2. _______ is the process in which liquid changes to gas below the boiling point.
1. Sublimation
2. Condensation
3. Evaporation
4. Combustion
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3. On a hot day, the outside of a glass containing a cold drink becomes frosty. When touching the glass, it feels
1. water that has passed through the glass
2. water that has condensed from a gas in the air
3. water that has solidified
4. water that has absorbed energy
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4. The change of a liquid to a solid is called
1. freezing
2. Melting
3. sublimation
4. vaporization
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5. During which of the following processes is there a decrease in the heat content of the form of water indicated?
1. Ice as it forms on a lake
2. Water droplets as they fall to the ground
3. Water as it evaporates from a pond
4. Snow as it melts on a mountainside
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6. When substances go directly from the solid phase to the gas phase, the phase change is called
1. sublimation
2. condensation
3. evaporation
4. vaporization
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Heat (thermal energy)
Tem
pera
ture
º C
.
100
0
A
B
C
DE
melting
freezing
condensing
boiling
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• http://www.youtube.com/watch?v=vDZhUkp30tE&feature=related