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Most of the countries that issue coins called pennies or cents mint them with an outer layer of copper or bronze (*). Copper oxidizes (i.e. tarnishes) very easily because it reacts with everything from oxygen in the air to dirt and oils on peoples' fingers, so the coins quickly change color in circulation.
(*) Cents and pennies used to be made out of solid copper or bronze, but the cost of copper has gone up so much that nearly every country has changed the coins to be made of a cheaper metal like steel or zinc, with only a thin copper plating so they look the same as they did in the past.
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∙ 13y ago
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What is created when a penny sits in a paper towel wrapped in vinegar?
Pennies get dull over time because the copper in the pennies slowly reacts with air to form copper oxide. Pure copper metal is bright and shiny, but the oxide is dull and greenish. When you place the pennies in the vinegar solution, the acetic acid from the vinegar dissolves the copper oxide, leaving behind shiny clean pennies.
What is 50000 pennies worth in money?
At 100 pennies to the dollar, 50,000 pennies makes $500.
How many pennies makes seventy dollars?
7000 pennies are in $70.00
How many is 1 dollar in pennies?
100 pennies makes a Dollar
What makes a blanket dull?
dirt
What is the importance of copper?
copper is important because it makes pennies and pennies are good
What is the mint?
Company that makes pennies
What is the property of copper?
it makes pennies
Dull is to boring as unselfish is to?
Makes sense
How many pennies makes 2 dollars?
There are 200 pennies in 2 dollars.
How can you describe the sound of a metal when i hit it?
It makes a dull sound, while a metal makes a ringing noise like a gong!
How many pennies makes 7 quarters?
7 quarters = 7*25 = 175 pennies.
