Category : Science Projects And Inventions
YOU NEED:
Connect two iron nails to a 9 volt battery with two 18 inch lengths of wire. Punch two holes in a piece of cardboard and pass the nails through them. Place the nails in a jar of salt water. Soon you will see that air bubbles begin to collect around the nails. Leave the apparatus for about 6 hours. You will see that the nail connected to the positive terminal gets coated with a thin layer of iron oxide or rust.
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