Mixutres2008

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  • The gas is cooled in the condenser until the temperature falls below the boiling point when it condenses back into a liquid which is collected in a container
  • The lowest boiling substance boils away, while the other components of the mixture remain until the lowest boiling component has all boiled off. Only then does the temperature of the remaining mixture rise and other components are boiled off.
  • We use filtration frequently--in our coffee makers, automobile fuel lines, automobile air cleaners to name only a few examples.
  • Chromatography is used to separate and identify all sorts of substances in police work. Drugs from narcotics to aspirin can be identified in urine and blood samples, often with the aid of chromatography.
  • Mixutres2008

    1. 1. Mixtures November 16, 2009
    2. 2. Objectives <ul><li>Describe the properties of mixtures </li></ul><ul><li>Compare a mixture to a substance </li></ul><ul><li>Name common separation techniques for a mixture </li></ul><ul><li>Define mixture, homogeneous, heterogeneous, distillation, filtration, chromatography </li></ul>
    3. 3. Mixture <ul><li>Two or more kinds of elements or compounds combined without a chemical reaction. </li></ul><ul><li>Individual components maintain their individual properties. </li></ul>
    4. 4. <ul><li>Physical properties may change </li></ul><ul><li>Color </li></ul><ul><li>Melting point </li></ul><ul><li>Freezing point </li></ul><ul><li>Electron configuration of their atoms do not change. </li></ul>
    5. 5. <ul><li>Compounds combine in definite ratios – </li></ul><ul><li>H 2 0, C 6 H 12 O 6 , CO 2 , NaCl </li></ul><ul><li>Mixtures do not combine in definite amounts. They can be present in any ratio. </li></ul>
    6. 6. Matter Classification
    7. 7. Mixture Classification <ul><li>Mixtures are classified according to how well they are mixed. </li></ul><ul><li>Heterogeneous </li></ul><ul><li>Homogeneous </li></ul>
    8. 9. Separation techniques <ul><li>Manually . </li></ul>
    9. 10. Separation techniques <ul><li>Distillation </li></ul><ul><li>The solution is heated until it boils. The liquid with the lowest boiling point boils first and becomes a gas. </li></ul><ul><li>Evaporation </li></ul>
    10. 12. Separation techniques <ul><li>Decantation This separates a liquid from insoluble solid sediment by carefully pouring the liquid from the solid without disturbing the solid </li></ul>
    11. 13. Separation techniques <ul><li>Filtration . This separates a solid from a liquid through the use of a porous material as a filter. </li></ul><ul><li>Paper, charcoal, or sand can serve as a filter. </li></ul>
    12. 14. Separation techniques <ul><li>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. </li></ul>
    13. 15. Separation techniques <ul><li>Chromatography . a method for analyzing mixtures by separating them into the chemicals from which they are made. </li></ul>
    14. 16. Separation techniques <ul><li>Magnetism </li></ul>

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