Micro-Magic Experiment

STRATEGY: Mix a variety of compounds to see what happens, then develop a theory to explain what you observed.

PROCEDURES: Place 2 drops of each solution in solution I column with 2 drops of the corresponding solution II in a microplate cell being careful not to contaminate one dropper with another chemical. Record observations. Empty into the chemical waste container after mixing the 10 combinations, and rinse the plate 3 times being careful not to splash.

DATA: Construct a ruled off data table on the lower portion of this paper to include chemical formulas and observations for all possible combinations of these 0.1 M solutions: silver nitrate, barium chloride, potassium sulfate, iron III chloride, and sodium carbonate.

THEORY: On a separate sheet of paper, write balanced equations including a small (s) subscript for any compound you believe to be a solid. Hint: see pg 454 in Heath or pg. 221 in Prentice Hall textbooks and refer to the solubility section of your yellow chart...cloudiness or crystals indicate that a solid has formed. List the reactants with the abbreviation N.R. to the right of the arrow for any mixtures which had No Reaction. On the back of your data sheet, write a well thought out paragraph to explain why precipitates form and what holds them together.

DATA TABLE

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Focus for Viewing
Electrical Interactions in Chemistry

1. How does something become negative?



2. How does something become positive?



3. What does "neutral" mean?



4. What do positives do to negatives?



5. What charges seem to be stationary and which seem to move?



6. Record this data:

wt. of uncharged sphere _____________
wt. of charged sphere _____________
electric force ____________
constant value of Fr² _____________

7. What is the mathematical formula that relates the force and distance between charged objects?



8. What makes a precipitate form?