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13.1 solutions
 

13.1 solutions

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    13.1 solutions 13.1 solutions Presentation Transcript

    • Solutions 13.1
    • Mixtures
      • A solution is a homogeneous mixture of two or more substances uniformly dispersed throughout a single phase.
        • Stable…no settling.
        • In a homogeneous mixture the particles are molecule-sized, so the mixture appears to be made of only one substance.
          • Homo = looks the same
        • The particles of a heterogeneous mixture are large enough to see.
          • Hetero = looks different
    • Suspensions
      • A suspension is a mixture in which particles of a material are more or less evenly dispersed throughout a liquid or gas.
        • In a suspension, the particles may remain mixed with the liquid while the liquid is being stirred, but later they settle to the bottom.
        • Not stable.
      • Particle Model for a Suspension
    • Solution
      • Any mixture that is homogeneous.
        • Air is a gaseous solution.
      • A homogeneous liquid mixture:
        • one main component—a liquid
        • one or more additional ingredients that are present in smaller amounts.
    • Solutions
      • The solvent is the primary ingredient in a solution.
        • Water is the most common solvent.
        • Water is known as the universal solvent.
      • The other ingredients are the solutes.
        • Solutes are dissolved in the solvent.
      • Aqueous solutions have water as the solvent.
    • Solid Solutions?
      • Another type of solution involves one solid mixed with another solid.
        • Examples include alloys such as:
          • brass, bronze, and steel
          • The “gold penny” you made in lab was really brass.
    • Liquid and Solid Solutions
      • Gold and Gold Alloy
    • Colloids
      • A colloid is a mixture. Particles are middle sized .
        • Bigger than solution but smaller than
        • Stable
        • Homogeneous
        • Example: Milk
          • Looks homogeneous. But milk contains fat and lumps of casein (protein) in a liquid called whey.
    • Colloids show up in light.
    • Separating Mixtures
      • Mixtures are separated based on their physical properties.
        • Filtering, settling, evaporation…
      • Chromatography separates by differences in attraction.
    • Distillation
      • Separates by differences in boiling point
      • As one component reaches its boiling point, it evaporates from the mixture and is allowed to cool and condense. This is called a distillate.
        • Salt water can be boiled to make pure water. When the water boils away the salt is left behind.
    • READ CHAPTER 13 SECTION 1
      • ADD ANY VOCAB THAT I DID NOT COVER TO YOUR 13.1 NOTES.
      • DO: p.459 1-12