Physical and Chemical Changes - PowerPoint PPT Presentation

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Physical and Chemical Changes

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Physical and Chemical Changes What is a PHYSICAL CHANGE? A physical change alters the form of a substance, but does not change it to another substance. – PowerPoint PPT presentation

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Title: Physical and Chemical Changes


1
Physical and Chemical Changes
2
What is a PHYSICAL CHANGE?
  • A physical change alters the form of a substance,
    but does not change it to another substance.

Example Making Orange Juice
3
What is a CHEMICAL CHANGE?
  • When a substance undergoes a chemical change, it
    is changed into a different substance with
    different properties.

Example Baking a Cake
4
5 Signs of a Chemical Change
  • Color Change

5
Precipitation
  • 2. Precipitation the solid that forms from a
    solution during a chemical reaction.
  • It looks like a cloudy solid in an otherwise
    clear solution.

6
5 Signs of a Chemical Change
  1. Gas Production
  2. Temperature Change

7
5 Signs of a Chemical Change
  1. Changes in Characteristic Properties (odor, light
    given off)

8
Chemical or Physical Change?
  • Cutting paper?
  • Physical

9
Chemical or Physical Change?
  • Ice melting?
  • Physical

10
Chemical or Physical Change?
  • Toast burning?
  • Chemical

11
Chemical or Physical Change?
  • Rocket fuel burning?
  • Chemical

12
Chemical or Physical Change?
  • Sawing wood?
  • Physical

13
Chemical or Physical Change?
  • Metal rusting?
  • Chemical

14
Chemical or Physical Change?
  • Disappearing puddle?
  • Physical

15
Chemical or Physical Change?
  • Candle burning?
  • Chemical

16
Chemical or Physical Change?
  • Dry ice?
  • Physical
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