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Energetic Electrolysis Activity Guide Sciencenter, Ithaca, NY Page 5 www.sciencenter.org [Demonstrate the following procedure] Let’s all make two electrodes. Because we want an electrode with a lot of surface area, we are going to take a thin strip of foil and fold it back and forth accordion style. First push down your electrode so that it is flat. The alligator clips will carry the electricity from the battery into the electrodes. Clip one electrode on the end of each of your alligator clips. Next we can fully submerge our electrodes into the salt water. Before we connect to the battery please make sure that your electrodes are not touching each other. If the electrodes touch each other while they are connected to the battery, the battery will be damaged. [Stress the importance of this: if the electrodes touch, it will ruin the battery.] Now clip each free end of your alligator clips onto the springs of your battery. What do you see? (Gas bubbles will be produced on each electrode. There should be more gas bubbles on the electrode that is attached to the negative, cathode side where the hydrogen gas is produced) Do you notice more gas being produced at one of the electrodes? [There will be more gas produced at the cathode, negative side, where the hydrogen gas is produced.] Why do you think there is more gas produced there? [The electrolysis is splitting water or H2O. For each water molecule we see twice as much hydrogen gas than oxygen gas.] [Note: This is only accurate if you are using a sodium sulfate solution.] Great, what you are seeing is the production of hydrogen and oxygen gas! Why do you think there are more gas bubbles on one electrode than the other? [For every water molecule that separates, there is twice as much hydrogen (H20).] How do we know that we are actually trapping hydrogen gas? [Run a test, use our observation skills, etc.] One property of hydrogen gas is that it is very flammable. In fact hydrogen gas is so flammable that scientists are concerned about ways to safely store large amounts of hydrogen gas. [Show visitors the demonstration you have set up to capture hydrogen gas.] Slowly pull the test tube with hydrogen gas out of the water solution, being careful to keep the test tube pointed down so the gas doesn’t escape and to avoid having water flow up the test tube. [Holding the lit match under the test tube, slowly tilt the test tube. The hydrogen gas will encounter the flame and a quick explosion will occur.]PDF Image | Potentials of Hydrogen Power
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