Lecture 10, Chemical Reactions


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Chemical Equations

  1. Symbolism of chemical formula
  2. Types of Reactions
    1. Combination Reactions (two elements or compounds combine)
    2. A + B - > AB

    3. Decomposition Reactions (something breaks down)
    4. AB -> A + B

    5. Displacement Reactions (Switch reactants)
    6. AB + CD -> AD + BC

  3. Examples:
    1. Demonstrate Electrolysis of Water and balance equations
      1. H2O(l) -> H2(g) + O2(g) (Decomposition)
      2. H2(g) + O2(g) -> H2O(l) (Combination)
    2. Demonstrate mixing baking soda with vinigar makes a fizz (bring matches):
      1. Baking Soda + Viniger -> ?
      2. Sodium Bicarbonate + Acetic Acid (Hydrogen Acetate)
      3. NaHCO3(s) + HC2H3O2 (aq) -> Na+(aq) + H2O(aq) + CO2(g) + C2H3O2- (aq)

    3. Demonstrate precipitation of silver chloride
      1. NaCl(s) -> Na1+(aq) + Cl1-(aq)
      2. AgNO3 (s) -> Ag1+ (aq) + NO31-(aq)
      3. Ag1+ (aq) + Cl1-(aq) -> AgCl (s)
      4. NaCl (aq) + AgNO3 (aq) -> AgCl (s) + NaNO3 (aq)

    4. Fe(s) + Cl2(g) -> FeCl3(s) (Do this one on board)


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Scott Van Bramer
Department of Chemistry
Widener University
Chester, PA 19013

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Last Updated 11/1/02