Matter- Physical Transformations
Review from last class…
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Bill Nye- Phases of Matter (Finish
correcting)
Phases of Matter- Changes
Phases of Matter- Transformations
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Energy (heat) causes matter to
change state
By adding energy you can change
solidsliquids and liquidsgases
By removing energy you can change
gasesliquids and liquids solids
Phase Changes: Adding Energy
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Solid  Liquid: Melting
 Temperature at which it changes is called
Melting Point
Liquid  Gas: Boiling/Evaporating
 Temperature at which it changes is called
Boiling Point
Adding energy speeds up molecules and
increases their movement
Phase Changes: Removing Energy
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Gas  Liquid: Condensation
 Same temperature as the Boiling point
Liquid  Solid: Freezing
 Same temperature as the Melting point
Removing energy causes the particles to slow
down and decreases their movement
Phase Changes: Solids to Gases
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Some solids can completely “skip” the
liquid phase and change from solid gas
or from gas solid
This is called Sublimation and
Deposition
Iodine: https://www.youtube.com/watch?v=Ft2KgtlP8Lk
Dry Ice: https://www.youtube.com/watch?v=QhTekm5NdiE
Physical Transformations
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Any change of state (phase) is
considered a physical transformation
The composition of the molecule
doesn’t change just what state it is in
Ex: Ice is made of H2O molecules, when
heated, the H2O molecules stay H2O,
only the speed they are moving and
their positioning changes
http://www.middleschoolchemistry.com/multimedia/chapter2/lesson4#ice_bomb
http://www.middleschoolchemistry.com/multimedia/chapter2/lesson5#melting_ice
Heating Curve for Water
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The flat line on a heating curve represents a
change of state
The sloped line on a heating curve represents
a change in temperature
Learning Check 1
A.
1)
B.
1)
C.
1)
Water condenses at a temperature of
0°C
2) 50°C 3) 100°C
At a temperature of 0°C, water
freezes
2) melts 3) changes to a gas
When a gas condenses, heat is
applied
2) removed
Solution 1
A. Water condenses at a temperature of
3) 100°C
B.
At a temperature of 0°C, water
1) freezes2) melts
C. When a gas condenses, heat is
1) removed
Learning Check 2
Is energy applied (1) or removed (2) in each
of the following:
____A.
Ice to liquid water
____B.
Water vapor to rain
____C.
Water to ice
When it rains, the air becomes
1) warmer
2) cooler 3) does not change
Solution 2
Is energy absorbed (1) or released (2) in each of the
following:
A.
Ice to liquid water
1
B.
Water vapor to rain
2
C.
Water to ice
2
When it rains, the air becomes
1) warmer
Learning Check 3
Complete using the terms gains or loses
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In the cooling coils of a refrigerator, liquid
Freon ___________ heat from the food and
changes to a gas
Food ___________heat and becomes
colder
In the back of the refrigerator, Freon
_________ heat and condenses back to a
liquid
Solution 3
Complete using the terms gains or loses

In the cooling coils of a refrigerator, liquid Freon
gains heat from the food and changes to a gas

Food loses
heat and becomes colder

In the back of the refrigerator, Freon loses heat
and condenses back to a liquid
Worksheet- Physical Transformations
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On the back side of the “Phases of
Matter-Bill Nye” sheet
Complete the questions and hand in
to the pass in bin