Physical and Chemical Changes - PowerPoint PPT Presentation

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Physical and Chemical Changes

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Chemical Changes. The substance has changed. It looks and is different. Irreversible – PowerPoint PPT presentation

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Title: Physical and Chemical Changes


1
Physical and Chemical Changes
2
Physical Change
  • Substance looks different, but its not
  • Reversible
  • Characteristic properties remain the same
  • Types
  • Phase changes
  • Dissolution
  • Deformation

3
Phase Changes
  • Transformation of matter from one state to
    another
  • States of matter Solid, Liquid and Gas
  • Changes of state
  • Fusion (melting) S L
  • Vaporization (evaporation) L G
  • Deposition G S
  • Freezing (solidification) L S
  • Sublimation S G
  • Condensation G L
  • See textbook figure 20 on p. 191

4
Chemical Changes
  • The substance has changed
  • It looks and is different
  • Irreversible

5
Signs of Chemical Change
  1. Colour change rust, browning of an apple
  2. Bubbling/gas produced vinegar baking soda
  3. Precipitate formed 2 solutions that mix and a
    solid forms in the new solution
  4. Heat or light given off fireworks
  5. Temperature or mass change
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