physical & chemical changes
TRANSCRIPT
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Physical & Chemical Changes
•Is melted butter still butter?•Is soured milk still milk?•Are the ashes from a fire made of the same “stuff” as wood?
7th Grade
Brandy Butcher
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What is a physical change?
Change that affects one or more physical properties of a substance
A new substance is not formed
The substance keeps its identity (name)
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Examples of Physical ChangeAny state change
◦Melting◦Freezing◦Evaporating
DissolvingCuttingBending
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Examples of Physical Changes in NatureWater Cycle
Erosion
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Can you think of any examples?
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What is a chemical change?One or more substances are
changed into a new substance
New and different properties
New identity (name)
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Examples of a Chemical Change
Cooking Burning
Rusting
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Examples of Chemical Changes in NatureCarbon Cycle
Nitrogen Cycle
Chemical Weathering
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Can you think of any examples?
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What are the signs a chemical change is happening?Change in colorChange in odorProduction of heatProduction of fizzing, foam,
bubblesProduction of soundProduction of light
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What signs do this changes demonstrate?
Light/Sound/
Heat
Light/Sound/
Heat
Change in odor and color
Change in color
Change in odor and color
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Physical or Chemical Change?
Frying an egg?
Physical or Chemical
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Incorrect. Try again!
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Correct!
Try the next one!
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Physical or Chemical Change?
Souring Milk?
Physical or Chemical
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Incorrect. Try again!
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Correct!
Try the next one!
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Physical or Chemical Change?
Shredding paper?
Physical or Chemical
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Incorrect. Try again!
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Correct!
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