Substance Change

Substance Change

1. Physical Change

   • Changes of state
     • Increase in temperature
       • Melting
         • Solid to liquid
       • Evaporating
         • Liquid to Gas
       • Deposition
         • solid to gas
     • Decrease in temperature
       • Solidification
         • liquid to solid
       • Sublimation
         • gas to solid
       • Condensation
         • gas to liquid
   • Mixing

2. Chemical change

   • New substance produced
     • signs
       • Permanent colour change
       • Gas is given off
       • Solid precipitates out of solution
       • Change in temperature or light is given off

3. Chemical reactions

   • Examples
     • Combustion
       • Burning with oxygen
     • Photosynthesis
       • makes glucose from CO2 and water
     • Respiration
       • Sweating
         • Glucose + Oxygen = carbon Dioxide + Water vapour
     • Corrosion
       • Rusting
         • Iron + Water + Oxygen Gas = Iron Oxide
   • Old substances
     • Reactants
   • New substance
     • Product

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