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Types of Mixtures

Types of Mixtures. The saga continues…. Mixtures. Combination of more than one pure substance but not bonded chemically Can be separated physically or chemically! Salads, Kool-Aid, Pizza. Types of Mixtures: Homogeneous. “Homogeneous” means : appears the same throughout.

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Types of Mixtures

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  1. Types of Mixtures The saga continues….

  2. Mixtures • Combination of more than one pure substance but not bonded chemically • Can be separated physically or chemically! • Salads, Kool-Aid, Pizza.

  3. Types of Mixtures: Homogeneous • “Homogeneous” means: appears the same throughout. • Kool Aid contains water, sugar & coloring, but is not a pure substance because each of the ingredients can vary each time it is made. It is a homogeneous mixture because it is the same throughout and can be separated! • We say they are “miscible” (they dissolve completely).

  4. Types of Mixtures: Heterogeneous • “Heterogeneous” Mixture: Mixtures in which differences can be seen easily…oil & water, sand & water, flour & water.

  5. Mixtures also come in Different Forms • There are THREE Forms of mixtures: • Solutions • Suspensions • Colloids

  6. Solutions • A solution is a mixture that appears to be a single substance, but it is actually composed of 2 or more substances that are distributed evenly amongst each other. • SOLUTIONS ARE HOMOGENEOUS carbon dioxide is dissolved in water sugar & Kool-Aid powder are dissolved in water salt is dissolved in water

  7. Suspensions • A suspension is a mixture in which particles of a material are dispersed throughout a liquid or gas, but are large enough that they settle out. • SUSPENSIONS ARE HETEROGENEOUS Snow globe muddy water Italian dressing

  8. Colloids • A colloid is a mixture in which the particles are dispersed throughout but are not heavy enough to settle out. • COLLOIDS ARE HOMOGENEOUS Colloids have properties of both solutions & suspensions. milk mayonnaise

  9. Separating Mixtures • Substances in a mixture are physically combined, so processes bases on differences in physical properties are used to separate component • Numerous techniques have been developed to separate mixtures to study components

  10. Filtration • Sieving • Dissolving • Centrifuging • Evaporating • Distillation • Magnet

  11. Filtration • Used to separate heterogeneous mixtures composed of solids and liquids • Uses a porous barrier to separate the solid from the liquid • Liquid passes through leaving the solid in the filter paper

  12. Sieving • a porous material is used to separate particles of different sizes. • method is most commonly used to effect gross separations, as of liquids from suspended crystals or other solids.

  13. Dissolving • Used to separate two solids when one is soluble in water and the other is not • Put the solids in a solvent(water) and then use a filter to separate the insoluable solid

  14. Evaporation Evaporation can be used to separate a solute from the solvent in a solution

  15. Distillation • Used to separate homogeneous mixtures • Based on differences in boiling points of substances involved

  16. Centrifugesrotate containers of liquids to separate suspended materials with different densities. • Centrifuges separate different components of human blood or milk and to clarify solutions. A high speed separator can rotate at great speed to separate fat (cream) from milk. • The spin drier in washing machines is a type of centrifuge that throws out the liquid by the "centrifugal force" of the rotation.

  17. A magnet • Can be used to separate a magnetic substance from a non-magnetic substance

  18. What is it? Cheerios

  19. Homogeneous

  20. What is it? Trail Mix

  21. Heterogeneous

  22. What is it? Kool - Aid

  23. Homogeneous

  24. What is it? Italian Salad Dressing

  25. Heterogeneous

  26. Try these……….. Raisin Bran

  27. Orange Juice

  28. Air

  29. Cake Batter

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