Chemical and Physical Changes Physical Changes Only changes physical properties, does not become a new substance (usually reversible). Only changes physical.

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Presentation transcript:

Chemical and Physical Changes

Physical Changes Only changes physical properties, does not become a new substance (usually reversible). 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. When 1 or more substances form a new substance. Evidence: Evidence: –Production of a gas (not phase change) –Formation of a precipitate –Change in color –Change in temperature (without heat being added or taken heat being added or taken away) away) –Emission of light or odor

Is it a chemical or physical change? Sugar dissolving in tea Sugar dissolving in tea Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Logs burning Logs burning Chemical Change Physical ChangePhysical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Cutting paper Cutting paper Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Crushing an aspirin Crushing an aspirin Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Metal rusting Metal rusting Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Lighter fluid burning Lighter fluid burning Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? An egg rotting An egg rotting Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? An egg breaking An egg breaking Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Law of Conservation of Mass No matter what change occurs: No matter what change occurs: mass before = mass after mass before = mass after # of atoms before = # of atoms after

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