schoolscienceproject.blogspot.in
Destroyed metal
Put a piece of aluminum
foil with a copper coin on it into a glass of water, and let it stand for a
day. After this the water looks cloudy and at the place where the coin was
lying the aluminum foil is perforated. This process of decomposition is known
as corrosion. It often occurs at the point where two different metals are
directly joined together. With metal mixtures (alloys) it is particularly
common if the metals are not evenly distributed. In our experiment the water
becomes cloudy due to dissolved aluminum. A fairly small electric current is
also produced in this process.
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