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 ...
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!
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
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!
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 ...
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
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.
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 ...
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.
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 ...