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Pennies tarnish over time because the copper on their surface reacts with oxygen in the air to form copper oxides, which make the penny look dull. The acetic acid in vinegar is able to dissolve these copper oxides, leaving the penny shiny as if it were new.
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Apr 6, 2020 · Pennies are made of copper, and copper is shiny, but over time it becomes tarnished and appears black or brown because of copper oxide, which is created when copper bonds with oxygen. Acids mixed with salt help break down the copper oxide on the penny.
Steel is a metal made by combining iron, other metals, and carbon. As you found out when you cleaned your pennies, your mixture of salt and vinegar is really good at dissolving metals and metal oxides. When you put the steel nail in the mixture, some of the iron dissolves. Like the copper atoms, each of the iron atoms that dissolves leaves two ...
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In fact, new pennies are so pretty that it’s considered a compliment to say that something is as ‘shiny as a new penny’. But somewhere along the way, those pennies lose their luster. What happens? The answer is pretty simple – before 1982, pennies were made almost entirely from copper, and modern pennies are made of copper-plated zinc.
