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LAB 4: SEMESTER FINAL

  1. Based on what you have learned about ions, charges, atomic masses, atomic structure, the periodic table, moles, volume, molarity, etc., can you predict the behavior in an electric field of a salt that has two + charges per atom instead of one ?


    CaCl2             Ca++     +     2Cl-

    versus

    NaCl             Na+     +     Cl-


  2. Design an experiment to test that prediction:
    • Question: What is the effect on electric current of using a salt with atoms that have two positive charges each instead of one?
    • Hypothesis (your prediction for how this salt will compare to NaCl).
    • Test description
    • Materials/Procedure
    • Data
    • Data Analysis (graphs, calculations, formulas used)
    • Conclusion -
      • restate hypothesis
      • hypothesis right or wrong
      • defense of your conclusion using data to support your arguments.


  3. Do the experiment (Final day)

  4. Final Report Form
    1. Cover Page - Title, authors, Science 3, date
    2. Experiment #1 - NaCl
      Experiment #2 - CsCl
      Experiment #3 - NaCl vs KCl
      Experiment #4 - NaCl vs CaCl2



LAB 1     LAB 2     LAB 3     General Instructions



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