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Understanding Mixtures and Colloids

Feb 21, 2025

Mixtures Bamboozled Review

Use to practice. Remember to also study your notes, labs, and textbooks. Extra-help is available during snack & lunch recess by appointment

Types of Mixtures

Labeling Mixtures

  1. Solution

    • Has a solute and a solvent
    • Has high solubility
    • Never exhibits a Tyndall effect
  2. Suspension

    • Dust cloud
    • Muddy water
    • Sometimes exhibits a Tyndall effect
  3. Colloid

    • Meringue
    • Milk
    • Always exhibits a Tyndall effect

Characteristics of Mixtures

Homogeneous Mixtures

  • Consist of 2 or more substances
  • Same phase throughout
  • Uniform composition

Heterogeneous Mixtures

  • Consist of 2 or more substances
  • Different phases present
  • Scatters light

Tyndall Effect in Suspensions

  • Exhibits Tyndall effect when mixing, but not after particles settle.

Differences Between Suspensions and Colloids

  • Colloid: Particles do not settle.
  • Suspension: Particles settle, forming density layers.

Types of Colloids

Foam

  • Colloid of a gas in a liquid or a solid.

Emulsion

  • Colloid of a liquid in a liquid.

Gel

  • Colloid of a liquid in a solid.

Aerosol

  • Colloid of a liquid in a gas.

Sol

  • Colloid of a solid in a liquid or a solid.

Elements vs. Compounds

Element

  • Made of one pure substance
  • Comprised of atoms

Compound

  • Made of two or more pure substances
  • Comprised of molecules

Identifying Types of Colloids

  1. Emulsion: Mayonnaise, Egg
  2. Gel: Gummy bears, Hair gel
  3. Aerosol: Hairspray
  4. Foam: Whipped cream, Popcorn
  5. Sol: Marker ink, House paint