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Mixutres2008
 

Mixutres2008

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Mixutres2008 Mixutres2008 Presentation Transcript

    • Notes: Mixtures
    • CW: Substances vs Mixtures
    • H: More about Mixtures
  • Mixtures November 12, 2008
  • Objectives
    • Describe the properties of mixtures
    • Compare a mixture to a substance
    • Name common separation techniques for a mixture
    • Define mixture, homogeneous, heterogeneous, distillation, filtration, chromatography
  • Mixture
    • Two or more kinds of elements or compounds combined without a chemical reaction.
    • Individual components maintain their individual properties.
    • Physical properties may change.
    • Their atoms do not change.
    • Mixtures do not combine in definite amounts. They can be present in any ratio.
  • Mixture Classification
    • Mixtures are classified according to how well they are mixed.
    • Heterogeneous
    • Homogeneous
  • Separation Techniques
  • Manually
  • Settling
    • Centrifuge is a device in which solid or liquid particles of different densities are separated by rotating them in a tube in a horizontal circle.
  • Filtration
    • Separates a solid from a liquid through the use of a porous material as a filter.
    • Paper, charcoal, or sand can serve as a filter.
  • Magnetism
  • Chromatography
    • Separates mixtures into the chemicals from which they are made.
  • Distillation
    • Solution is heated until it boils. The liquid with the lowest boiling point boils first and becomes a gas.
  •  
  • Decantation
    • Separates a liquid from insoluble solid sediment by carefully pouring the liquid from the solid without disturbing the solid
  •