Arouse student curiosity. Irwin Talesnick’s famous orange juice clock is guaranteed to get your students thinking! How does the clock work? How long will the clock run on orange juice? Can you use something other than orange juice? Hundreds of questions can be asked and investigated. Allow students to design and do their own experiments. Instructions and teaching tips are provided.
Concepts: Electrolysis, oxidation–reduction, anode, cathode. Time Required: 15 minutes Materials Provided: Three-color, 24-hour clock face (atomic number 1, H, Hydrogen, through to atomic number 24, Cr, Chromium), complete clock assembly, hook-up wires, electrodes, orange juice.
A stiff piece of cardboard or wood for hanging the clock is required.