The Gold Penny Lab. In this lab, you will be converting a regular penny into a “gold” penny. In doing so, you are following a tradition that goes back to the earliest days of chemistry. The modern practice of chemistry started with the study of alchemy in medieval Europe and the Middle East.
Before 1982, pennies contained about 95% copper and 5% zinc. After 1982, however, the composition of pennies was changed to contain mostly zinc and only a small amount of copper.
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Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry.. 11.3k 6 6 gold badges 34 34 silver badges 82 82 bronze badges. asked Dec 13 '12 at 1:57.. So when use vinegar-salt solution to clean penny, Copper Oxide parellely reacts with HCl and CH3COOH both and gives.
The silvery color you're seeing on the penny is actually a type of white brass, not pure zinc. This is thermodynamically more favorable than pure separate metals and thus serves as the driving force. Anyway, whatever the specific chemical reason, we've now deposited zinc onto copper. The most amazing trick is to turn it into gold.
Hi Osakwe, that is an interesting question. Gold is a pretty soft metal so usually it will gradually lose weight over its lifetime. For example, a new wedding band may measure 1.5mm thick and weigh 3 grams. 20 years later afrer be scratched, polished, scratched again, etc. that same band may measure 0.5mm thick and weigh just 1.5 grams.
Chemical reactions are responsible for the change in a penny’s appearance over time. Kids will love trying their hand at the classic cleaning pennies science experiment to see if they can use a chemical reaction to make pennies shine brightly once again. Cleaning Pennies Science Experiment. If you have dirty, dull, or green pennies lying.