Physical%20and%20Chemical%20Changes

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Physical and Chemical Changes
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Physical Changes

• Alter the physical properties of a substance
• DOES NOT change the identity of the substance

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• A physical change does not produce a new
  substance.
• Many physical changes can be reversed

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Physical Change
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Chemical Changes

• Substance is changed into a new substance with
  different properties.
• The identity of the substance IS changed.
• A reaction takes place creating a new substance.

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Unlike a physical change

• Chemical changes are very difficult or impossible
  to reverse

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• Heat or Light is given off.

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• A new odor is made.