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What turns a penny green?

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!

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

Example video title will go here for this video

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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How much is a 1969 penny worth?

How much is a 1969 Penny worth? This section is more of a layman's guide, for those new to collecting. In Average Circulated (AC) condition it's worth around 1 cent, one in certified mint state (MS+) condition could bring as much as $15 at auction.

How much is a 1969 Penny worth?

This section is more of a layman's guide, for those new to collecting. In Average Circulated (AC) condition it's worth around 1 cent, one in certified mint state (MS+) condition could bring as much as $15 at auction. This price does not reference any standard coin grading scale. So when we say Average Circulated, we mean in a similar condition to other coins circulated in 1969, and mint state meaning it is certified MS+ by one of the top coin grading companies. *** [?]. If you are a fan of coin roll hunting or just want to learn more about lincoln pennys then search or scroll below to find the most valuable and rarest in this series.

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