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SHHHH! This is Silent reading time!

SHHHH! This is Silent reading time! . Grade 7 Science. Separating M ixtures and Solutions. Many products depend on technology for separating mixtures and solutions. What are the three solids and the liquid in the picture below? White, yellow and brown sugar Molasses .

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SHHHH! This is Silent reading time!

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  1. SHHHH! This is Silent reading time!

  2. Grade 7 Science Separating Mixtures and Solutions

  3. Many products depend on technology for separating mixtures and solutions What are the three solids and the liquid in the picture below? White, yellow and brown sugar Molasses

  4. What you will learn: In this chapter, you will • identify separation techniques that are used in and around the home • describe how to use different methods to separate a variety of mixtures • identify examples of how science related to mixtures and solutions affects our lives

  5. Student Activity: Discuss with a partner how you would separate the following mixtures…

  6. Separating Mixtures…

  7. Separating Mixtures…

  8. Discussion Question “Are the components you have separated still mixtures, or are they pure? Why or why not?”

  9. Open your books to page 278

  10. Separation Techniques Mechanical Sorting: • Used to separate the parts of a mixture based on properties such as particle size. • Examples: floatation & magnetism

  11. magnetism floatation

  12. Filtration: • A common way to separate solid particles from a mixture • The filters can have holes of varying sizes… small to microscopic.

  13. Oil filter Coffee filter Colander Furnace filter

  14. Evaporation: • Change of state from a liquid to a gas. • Used to recover a solid solute from a solution.

  15. Distillation: • Uses two changes of state: evaporation and condensation. • It allows you to recover BOTH the solute and solvent from a solution.

  16. Condensation Evaporation

  17. Short Distillation video: http://www.youtube.com/watch?v=xxNfJLMNS4E

  18. Another quick video: http://www.youtube.com/watch?v=Uep3AxaAqLw

  19. Paper Chromatography: • Used to separate the colored substances in a mixture such as ink. • Used to separate the solvents in a mixture.

  20. Neat Chromatography activity: http://www.youtube.com/watch?v=-fs5btFKdXA

  21. Separation Techniques in the Home: • Colanders • Clothes dryers • Window screens • Coffee percolators • Salad spinners Any others?

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