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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 In most cases ... – 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
  • In most cases, it can be reversed.

Example Melting ice Cutting paper
3
What is a Chemical Change?
  • When a substance undergoes a chemical change, it
    is changed into a different substance with
    different properties. (irreversible)

Example Baking a Cake Rusty nail
4
5 Signs of a Chemical Change
  1. Color Change
  2. Precipitation

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

6
5 Signs of a Chemical Change
  1. Changes in Characteristic Properties (odor, light
    given off)

7
Chemical or Physical Change?
  • Toast burning?
  • Chemical

8
Chemical or Physical Change?
  • Rocket fuel burning?
  • Chemical

9
Chemical or Physical Change?
  • Sawing wood?
  • Physical

10
Chemical or Physical Change?
  • Metal rusting?
  • Chemical

11
Chemical or Physical Change?
  • Disappearing puddle?
  • Physical
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