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