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3.3 3.3 Presentation Transcript

  • 3.3 Mixtures of Matter
  • Mixtures
    • Combination of 2 or more substances
    • Mixed, not bonded together
    • Can be separated physically
  • Heterogeneous Mixture
    • Not-even blending
    • Examples:
      • OJ with pulp
      • Milk
      • Dirty water
      • Oil/vinegar salad dressing
      • fog
  • Homogenous Mixture
    • Even blending
    • a.k.a. “solution”
    • Examples
      • Gas-gas
      • Gas-liquid
      • Liquid-gas
      • Solid-liquid
      • Solid-solid
  •  
  • Separating Mixtures
    • Each based on some physical property
      • Size of particles
      • Solubility
      • Boiling point
      • Melting point
      • Conductivity
      • Magnetism
      • Etc.
  • Filtration
    • heterogeneous mixtures – sep. by size
    • Best for solid in a fluid (liquid or gas)
  • Distillation
    • Good for homogeneous solutions (if components have different boiling points)
  • Crystallization
    • Form solid particles from a supersaturated solution
    • Adding more substance to solution = crystals!
  • Sublimation
    • Only works for substances that do this (at different temperatures)
  • Chromatography
    • Size separation
    • Commonly used for pigments
  • 15. Classify the following as heterogeneous or homogeneous
    • A. tap water
    • B. air
    • C. raisin muffin
  • 17. Describe the separation technique that could be used
    • A. two colorless liquids
    • B. a nondissolving solid mixed with a liquid
    • C. red and blue marbles of same size and mass