Because the rise in value of copper made pennies worth more than one cent.
Wiki User
∙ 10y agoThe metal composition of penny coins made after 1982 is 97.5 percent zinc and 2.5 percent copper. The first penny coins, from 1793 to 1837, were made from pure copper.
Midway through 1982, the composition of the US penny changed from 95% copper and 5% zinc to 97.5% zinc and 2.5% copper (in the form of a coating of pure copper over a core of zinc).
The cent (penny) has been changed many times over the years. In 1982 it was changed from bronze to copper-plated zinc because the price of copper increased and it cost more than 1 cent to make a penny. In 1943 cents were made of steel to save copper for use in ammunition. In 1864 the composition was changed from cupronickel to bronze because nickel is so hard it damaged the coin presses available at the time. In 1857 the composition was changed from pure copper to cupronickel and the con was reduced in size because it contained more than 1 cent worth of copper.
Abraham Lincoln
"Staw Penny" refers to an old US penny with wheat on the back, which was the design through the 1950s. Current pennies have the Lincoln Memorial on the back.
Putting a penny in lemon juice would cause a chemical change because the lemon juice reacts with the copper in the penny to create copper oxide, which changes the chemical composition of the penny.
The weight depends on the year, as there was a change in the metal composition in 1982. Pennies minted after that weigh 2.5 grams. Older ones weigh 3.11 grams.
Chemical.
A 1963 US penny is made of 95% copper and 5% zinc. The composition of US pennies changed in 1982 to being made of primarily zinc, with a copper coating.
no a penny is copper... Actually not since 1982.... In the middle of that year the rising price of copper forced the Mint to change the coin's composition to zinc with a thin copper plating. The copper plating is only 2.5% of the coin's composition.
A 1955 Lincoln cent is Bronze, it has a composition of .950 copper and .050 tin & zinc.
The 2007 penny is made out of copper-plated zinc. It has a composition of 97.5% zinc and 2.5% copper.
Cleaning a penny with vinegar and salt is a chemical change. The vinegar (acetic acid) reacts with the salt (sodium chloride) to form a chemical compound that removes the tarnish on the copper surface of the penny. This reaction changes the composition of the penny's surface, making it appear shiny and clean.
See related answers.
The 2008 US Cent is composed of a 99.2% zinc and .8% copper core with a plating of pure copper.
The metal composition of penny coins made after 1982 is 97.5 percent zinc and 2.5 percent copper. The first penny coins, from 1793 to 1837, were made from pure copper.
Yes, soaking a penny in bleach will strip away the copper coating, causing it to turn white as the zinc core is exposed. However, this would significantly devalue the penny as it alters its appearance and composition.