Chemistry+Ch2-4

==**Vocabulary Review: ** == **[] **

=Physical and Chemical Changes (2-4) =
 * In a physical change, substances change form but not their identities. In a chemical change, substances change into other substances.


 * Matter changes whenever energy is added to or taken away from it.


 * Changes of state occur when a substance gains or loses energy and the particles of the substance are rearranged.


 * Chemical changes are also called chemical reactions. Chemical reactions either absorb or release energy.

A precipitation is the formation of a solid in a solution during a chemical reaction. [|Notes Chapter 2 Section 4.doc]

Power Point Review of Physical and Chemical Change

The following website explains the difference between physical and chemical changes: []

The following music video reviews physical and chemical change:

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The following video reviews physical and chemical change (and introduces some high school chemistry) media type="youtube" key="ZobSZq6WUcM" height="390" width="480"

The following video reviews physical changes (melting, evaporation, condensation): media type="youtube" key="yyxc-81JDbo" height="390" width="480"

Another review video on physical and chemical change:

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Explanation of how heat causes changes in states of matter:

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Another video explaining how heat is involved in changes in state:

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Bill Nye explains chemical reaction:

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Take a quiz on physical and chemical changes using one of the following websites: []

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