Notes
Slide Show
Outline
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Unit 6 – Solids, Liquids and Solutions
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Intermolecular Forces
  • Dipole-dipole attraction
  • Hydrogen bonds
  • Dispersion forces
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Forces and Phases
  • Substances with very little intermolecular attraction exist as gases
  • Substances with strong intermolecular attraction exist as liquids
  • Substances with very strong intermolecular (or ionic) attraction exist as solids
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Phase Differences
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Three Phases of Matter
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Effect of Pressure on Boiling Point
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Types of Solids
  • Crystalline Solids:  highly regular arrangement of their components [table salt (NaCl), pyrite (FeS2)].
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Representation of Components in a Crystalline Solid
  • Lattice:  A 3-dimensional system of points designating the centers of components (atoms, ions, or molecules) that make up the substance.
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Unit Cell
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Packing in Metals
  • Model:  Packing uniform, hard spheres to best use available space.  This is called closest packing.  Each atom has 12 nearest neighbors.


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Types of Solids
  • Amorphous solids:  considerable disorder in their structures (glass and plastic).
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Water phase changes
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Phase Diagram
  • Represents phases as a function of temperature and pressure.
  • Critical temperature:  temperature above which the vapor can not be liquefied.
  • Critical pressure:  pressure required to liquefy AT the critical temperature.
  • Critical point:  critical temperature and pressure (for water, Tc = 374°C and 218 atm).
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Phase changes by Name
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Water
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Carbon dioxide
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Carbon
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Sulfur
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Classification of Matter
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Solute
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Solvents
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Dissolution of sodium Chloride
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Concentrated vs. Dilute
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Heat of Solution
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Electrolytes vs. Nonelectrolytes
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Definition of Electrolytes and Nonelectrolytes
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Electrolytes?
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Answers to Electrolytes
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Suspensions and Colloids
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Types of Colloids
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The Tyndall Effect
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Factors Effecting Solubility
  • The solubility of MOST solids increases with temperature.
  • The rate at which solids dissolve increases with increasing surface area of the solid.
  • The solubility of gases decreases with increases in temperature.
  • The solubility of gases increases with the pressure above the solution.
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Therefore…
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Saturation of Solutions
  • A solution that contains the maximum amount of solute that may be dissolved under existing conditions is saturated.
  • A solution that contains less solute than a saturated solution under existing conditions is unsaturated.
  • A solution that contains more dissolved solute than a saturated solution under the same conditions is supersaturated.
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Solubility Chart
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Calculations of Solution Concentration
  • Concentration - A measure of the amount of
  • solute in a given amount of solvent or solution
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Colligative Properties
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Freezing Point Depression
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Boiling Point Elevation
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Freezing Point Depression and Boiling Point Elevation Constants
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Properties of Acids
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Acids you SHOULD know:
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Sulfuric Acid
  •  Highest volume production of any chemical in the U.S.
  •  Used in the production of paper
  •  Used in production of fertilizers
  •  Used in petroleum refining
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Nitric Acid
  • Used in the production of fertilizers
  • Used in the production of explosives
  • Nitric acid is a volatile acid – its reactive components evaporate easily
  • Stains proteins (including skin!)
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Hydrochloric Acid
  • Used in the pickling of steel
  • Used to purify magnesium from sea water
  • Part of gastric juice, it aids in the digestion of protein
  • Sold commercially as “Muriatic acid”
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Phosphoric Acid
  • A flavoring agent in sodas
  • Used in the manufacture of detergents
  • Used in the manufacture of fertilizers
  • Not a common laboratory reagent
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Acetic Acid
  • Used in the manufacture of plastics
  • Used in making pharmaceuticals
  • Acetic acid is the acid present in vinegar
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Acids are Proton Donors
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Strong Acids vs. Weak Acids
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Strong Acid Dissociation
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Weak Acid Dissociation
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Organic Acids
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Examples of Organic Acids
  •  Citric acid in citrus fruit
  •  Malic acid in sour apples
  •  Deoxyribonucleic acid, DNA
  •  Amino acids, the building blocks of protein
  •  Lactic acid in sour milk and sore muscles
  •  Butyric acid in rancid butter
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Acids Effect Indicators
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Acids Have a pH less than 7
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Acids React with Active Metals
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Acids React with Carbonates
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Effects of Acid Rain on Marble
(calcium carbonate)
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Acids Neutralize Bases
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Properties of Bases
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Examples of Bases
  •  Sodium hydroxide (lye), NaOH
  •  Potassium hydroxide, KOH
  •  Magnesium hydroxide, Mg(OH)2
  •  Calcium hydroxide (lime), Ca(OH)2
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Bases Effect Indicators
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Bases have a pH greater than 7
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Bases Neutralize Acids