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Chemical and Physical Changes. Physical Changes. Only changes physical properties, does not become a new substance (usually reversible). Phase changes Dissolving Breaking. Chemical Changes. When 1 or more substances form a new substance. Evidence: Production of a gas (not phase change) - PowerPoint PPT Presentation
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Chemical and Chemical and Physical ChangesPhysical Changes
Physical ChangesPhysical Changes
Only changes physical properties, Only changes physical properties, does not become a new substance does not become a new substance (usually reversible).(usually reversible).– Phase changesPhase changes– DissolvingDissolving– BreakingBreaking
Chemical ChangesChemical Changes
When 1 or more substances form a new When 1 or more substances form a new substance.substance.
Evidence:Evidence:– Production of a gas (not phase change)Production of a gas (not phase change)– Formation of a precipitateFormation of a precipitate– Change in colorChange in color– Change in temperature (withoutChange in temperature (without heat being added or takenheat being added or taken away)away)– Emission of light or odorEmission of light or odor
Is it a chemical or physical Is it a chemical or physical change?change?
Sugar dissolving Sugar dissolving in teain tea
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Is it a chemical or physical Is it a chemical or physical change?change?
Logs burningLogs burning
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Is it a chemical or physical Is it a chemical or physical change?change?
Cutting paperCutting paper
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Is it a chemical or physical Is it a chemical or physical change?change?
Crushing an Crushing an aspirinaspirin
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Is it a chemical or physical Is it a chemical or physical change?change?
Metal rustingMetal rusting
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Is it a chemical or physical Is it a chemical or physical change?change?
Lighter fluid Lighter fluid burningburning
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Is it a chemical or physical Is it a chemical or physical change?change?
An egg rottingAn egg rotting
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Is it a chemical or physical Is it a chemical or physical change?change?
An egg breakingAn egg breaking
•Chemical Change
•Physical Change
OOPS!OOPS!Did it change size, color, shape Did it change size, color, shape
(Physical Change)?(Physical Change)?oror
Did it become different matter Did it become different matter (Chemical Change)?(Chemical Change)?
Correct!Correct!
Law of Conservation of MassLaw of Conservation of Mass
No matter what change occurs:No matter what change occurs:
mass before = mass aftermass before = mass after
# of atoms before = # of atoms # of atoms before = # of atoms afterafter
Images CitedImages Cited
http://www.learner.org/channel/http://www.learner.org/channel/courses/essential/physicalsci/courses/essential/physicalsci/session4/closer1.htmlsession4/closer1.html
http://www.hcbe.net/itc/http://www.hcbe.net/itc/powerpoints/science/files/powerpoints/science/files/CF61DBA93ED44B4B8A5C75E1A1AECF61DBA93ED44B4B8A5C75E1A1AEB2CC.pptB2CC.ppt
