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Assuming you're referring to a US cent, the composition was changed in 1982 because the price of copper increased to the point where a penny contained more than one cent worth of metal. The design was changed in 2010 because the Lincoln Memorial design had been in use for 50 years and the Mint wanted to use a new image.
What else can I help you with?
Why did the penny formula change?
cause the value of the penny was more then wat it was worth
Is putting a penny in lemon juice a physical or chemical change?
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.
What happens to a penny when it meets Clorox?
the Clorox makes the penny erode and change colors.
What kind of soda changes the color of a penny?
Coke or sprite will change the color of a penny.
Basic liquids that cause a penny to rust?
water
What liquids make a penny green?
A penny can turn green when exposed to acidic liquids like lemon juice or vinegar, which cause a chemical reaction with the copper in the penny to create a greenish patina. Saltwater can also cause a copper penny to turn green over time due to oxidation.
Is salt and vinegar removing tarnish from a penny a physical change?
Physical change
Why does ammonia change color if it cleans a penny?
When ammonia cleans a penny, it reacts with the copper oxide layer on the penny's surface. This reaction removes the oxide layer and exposes the shiny copper underneath, causing the penny to appear brighter or even change color.
Why does water stay long on a penny?
Water stays on a penny due to surface tension and cohesion forces. These forces cause water molecules to stick together and to the penny, creating a thin film of water that doesn't easily slide off. Additionally, the hydrophobic nature of the copper in the penny repels water to some extent, further helping the water to stay on the surface.
Is a copper penny turning dark a chemical change or physical change?
Chemical.
Is a blackened penny a physical or chemical change?
Chemical
Is it a good idea to change the metal used for a penny?
no
