Short description Key concepts: water electrolysis, green energy Duration: 25 minutes
Students will split water into hydrogen and oxygen and collect the two product gases in test tubes.

In small groups the kids will be designing and assembling a water electrolysis device. In principle, the "device" uses electricity from a battery, to electrochemically separate water into its constituent components (hydrogen and oxygen). Each group of students will be supplied with a plastic, transparent cup, two electrode leads (insulated wire with alligator clips at either end), two steel thumbtacks, two plastic test tubes, a nine-volt battery, table salt and water. Using these materials, they will build an electrochemical cell and collect the gases produced.

Electrochemical Cell Summary