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Transcript
Decomposition of Zinc Iodide Purpose: To observe a decomposition chemical reaction involving the formation of the constituent elements from a compound. To use electrical energy to break the chemical bonds of a compound. Background Information: Chemical reactions occur when atoms are separated, rearranged, and/or joined in a new way. In this experiment you will decompose the chemical compound you synthesized in the laboratory yesterday. Energy is always required to break the bonds of a compound. You will use a 9 volt battery to supply the energy for the reaction. The reaction is an example of electrolysis. Electrolysis is the process of using electricity to decompose compounds in an aqueous solution. You should observe the formation of zinc crystals at one electrode and the formation of iodine at the other. Equipment: Micropipet with water 9 Volt Battery Lead Wires with Clamps Watch Glass Copper Wire Chemicals: Product from the laboratory experiment completed yesterday. Experimental Procedure: Wear your safety glasses throughout the experiment! 1. Carefully take your sample of zinc iodide out of the oven. The watch glass will be hot and Mr. Gensits will demonstrate how to safely remove the sample. Record your observations of the product. 2. Using a micropipet, add a small amount of distilled water to the sample on the watch glass. 3. Carefully stir with a clean, dry glass stirring rod until the sample is completely dissolved. 4. Place two small pieces of copper wire in the solution in the watch glass. The ends of the two wires should be about 1 inch apart. Attach them to the watch glass using two small pieces of tape to prevent them from moving. 5. Attach the other ends of the two copper wires to the terminals of a 9 volt battery using the wire leads. For the best results do not move or disturb the wires. 6. Observe what happens at ends of the copper wires. 7. Wash the watch glass with soapy water and place it in the white plastic bin.