Physical and Chemical Changes. What is a Physical Change? A physical change changes the form of a substance, but does not create anything new. Starting.

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Presentation transcript:

Physical and Chemical Changes

What is a Physical Change? A physical change changes the form of a substance, but does not create anything new. Starting Substance = ending substance Example: Making Orange Juice An ice cube melting

What is a Chemical Change? Substances are changed into something new with different properties that the original substance. Starting substance = something new Example: Baking a Cake Wood burning

5 Signs of a Chemical Change 1. Color Change 2. Precipitation

Precipitation Precipitation – the solid that forms from a solution during a chemical reaction. It looks like a cloudy solid in an otherwise clear solution.

5 Signs of a Chemical Change 3. Gas Production 4. Temperature Change

5 Signs of a Chemical Change 5. Changes in Characteristic Properties (odor, light given off)

Chemical or Physical Change? Cutting paper? Physical

Chemical or Physical Change? Ice melting? Physical

Chemical or Physical Change? Toast burning? Chemical

Chemical or Physical Change? Rocket fuel burning? Chemical

Chemical or Physical Change? Sawing wood? Physical

Chemical or Physical Change? Metal rusting? Chemical

Chemical or Physical Change? Disappearing puddle? Physical

Chemical or Physical Change? Candle burning? Chemical

Chemical or Physical Change? Dry ice? Physical