July 22, 2013
Summer Chemistry
Dr. Forman
1. The treated coins appear to be composed of other metals opposed to copper for example zinc. We think this because the color changed from a copper color to silver.
2. We would say that the claim would be incorrect because it forms alloys not precious metals.
3. Two practical uses for metallic charges similar to those we observed in this investigation is because alloys were formed. This causes a stronger metal to be formed from less strong elements that composed them, then these alloys are able to be used for everyday uses.
4.
a. The penny that was only placed in the bubbling zinc chloride solution formed a less alloy of copper and zinc. However, the penny that was placed in both the bubbling zinc chloride solution and directly placed onto the hot plate formed a more combined alloy. Overall, they had different reactions depending on the procedure they undertook.
b. I think that they could be converted back but only if they had an element in use that was more reactive.
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