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On February 25 one of Mr. Tobul's junior class was doing an experiment involving changing regular copper pennies into brass pennies. The experiment was done by placing a penny in a heated solution of sodium hydroxide and zinc dust then letting it sit for about a minute. After a minute the penny is removed from the solution and appears to be silver. Once the now silver penny is dry to make it gold the students placed the penny on a hot plate and watched the penny turn brass before their eyes. Why does this happen? Well the heated zinc forms a layer over the penny making it appear silver. Then when placed on the hot plate the silver and copper from the penny mix together to form brass, and make the penny a gold color.



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