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What causes pennies to get dirty? | Reference.com

www.reference.com/business-finance/causes-pennies-dirty-a5f49695bbd26892

The dark brown color of a penny is most likely oxidation, which occurs when the copper in the penny comes in contact with oxygen. Since the average penny ...

Chemistry cleans pennies! - Planet Science

www.planet-science.com/categories/under-11s/chemistry-chaos/2011/03/chemistry-cleans-pennies.aspx

What you need: Dirty pennies; White vinegar; Table salt; Shallow glass or plastic bowl. How to: ... It's the same reaction that makes the Statue of Liberty green!

Science Activity: Turn Old Pennies Bright and Shiny! | Exploratorium

www.exploratorium.edu/science_explorer/copper_caper.html

20 dull, dirty pennies; 1/4 cup white vinegar; 1 teaspoon salt; A clear, shallow bowl (not ... Copper atoms can combine with oxygen atoms from the air to make a  ...

Dirty Pennies | Experiments | Triunfo

cns-eoc.colostate.edu/triunfo/experiments/dirty_penny.html

The pennies are dirty from being used, but there is more causing them to dull. ... But this isn't permanent, you can clean them and make them shiny again!

Chemical Reaction – Penny Cleaner Kids' Blog

www.indypl.org/kids/blog/?p=9577

Nov 3, 2013 ... A chemical reaction takes place that makes a molecule called copper oxide – that is the dirty stuff that you see on the penny. This “stuff” is often ...

Why Do Pennies Turn Green? | International Precious Metals ...

www.preciousmetals.com/blog/2015/01/pennies-turn-green/

If the eraser is too hard, it can leave deep scratches in the penny. Place a dirty penny on a clean cloth and rub gently in a circular motion with the eraser. Flip the  ...

Copper & Kids - Copper Experiments

www.copper.org/education/Kids/copperandkids_cuexperiment.html

10 dirty pennies; 4 tablespoons lemon juice; 8 tablespoons vinegar; 1 teaspoon salt; small bowl (not metal!) ... The copper oxide makes the pennies look dirty.

What Are the Most Valuable Wheat Pennies? | Our Pastimes

ourpastimes.com/valuable-wheat-pennies-5815199.html

Errors make coins valuable, and the rarer the error, the greater the value. In 1922 , the Denver mint stamp did not show up on those pennies, and those that are ...

A simple solution to your dirty pennies! - Discovery Express

www.discoveryexpresskids.com/blog/a-simple-solution-to-your-dirty-pennies

Jul 11, 2015 ... Copper atoms can combine with the oxygen in the air to make copper oxide. Copper oxide is what makes older pennies look so dull.

CLEAN PENNIES WITH VINEGAR - ScienceBob.com

sciencebob.com/clean-pennies-with-vinegar/

Put about 5 pennies into the bowl and count to 10 slowly. Take out the ... Do other amounts of salt make a difference in the chemistry of the experiment? Science ...