Photo: Pok Rie

What does vinegar do to copper pennies?

When copper is exposed to oxygen, it forms molecules called copper oxide that make pennies look dirty. Pouring vinegar over the pennies helps break up this copper oxide and expose the pure copper on the penny. As the penny dries and is exposed to the air, a chemical reaction occurs and the penny turns green!

wltx.com - Turn copper pennies green with this chemistry experiment - WLTX.com

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The small coin easily reacts with oxygen to turn green, similar to the Statue of Liberty.

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COLUMBIA, S.C. — This experiment is a chemistry experiment that involves a reaction between copper and oxygen, also know as an oxidation reaction.

To do this experiment, you will need:

pennies

a sheet or bowl

white vinegar

paper towel

The setup for this experiment is pretty simple. You want to line your cookie sheet or bowl with paper towels, I double lined it! Then, place your pennies on the paper towel. Finally, pour vinegar over the pennies and make sure the paper towels their sitting on are completely saturated. Next, we wait! You will need some patience with this experiment. While it will be a bit smelly from the vinegar, it's best to wait multiple hours to a few days to see the best results. Have your students take observations every few hours to record any changes you see!

After some time, you should notice the pennies turning green!

How did this happen?

Pennies are made of copper. When copper is exposed to oxygen, it forms molecules called copper oxide that make pennies look dirty. Pouring vinegar over the pennies helps break up this copper oxide and expose the pure copper on the penny. As the penny dries and is exposed to the air, a chemical reaction occurs and the penny turns green! The green compound is called malachite. You may notice that not all of your pennies turn green. This usually has to do with the age of your pennies. Prior to 1982 pennies were made of copper. After 1982, they were made with only 2.5% copper and coated with zinc, so there are not as many copper molecules exposed to do this reaction.

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What coins to look out for?

9 of the most valuable coins in the world The 1794 Flowing Hair Silver Dollar. picture alliance/Getty Images. ... The 1787 Brasher Doubloon. ... The 1787 Fugio cent. ... The 723 Umayyad Gold Dinar. ... The 1343 Edward III Florin. ... The 1943 Lincoln Head Copper Penny. ... The 2007 $1 Million Canadian Gold Maple Leaf. ... 1913 Liberty Head V Nickel. More items... •

bankrate.com - 9 Of The World's Most Valuable Coins - Bankrate.com

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