0
Assuming you're asking what a US cent is made of:
Since mid-1982 all US cents have been made of 97.5% zinc with 2.5% copper plating.
From mid-1864 to 1942 and from 1944 to mid-1982 they were bronze, 95% copper and 5% tin and/or zinc
In 1943 they were made of zinc-plated steel due to wartime copper shortages.
From 1857 to mid-1864 they were made of copper alloyed with nickel.
Before that they were pure copper.
What else can I help you with?
What is the corrosion on a penny?
The corrosion on a penny is typically a greenish-blue substance called copper oxide that forms when the copper in the penny reacts with oxygen in the air and moisture. This process is known as oxidation and can give the penny a dull or tarnished appearance.
What causes vinegar to rust a penny?
Pennies are made of zinc plated with copper. Copper reacts with oxygen and water to form copper oxide. This is the tarnish you see on pennies that have been in damp conditions. The only U.S. coins that can truly rust are the 1943 zinc coated steel cents.
Is dropping a penny into a glass of water a physical change?
Yes
Which substance cleans a penny best lemon juice coke or vinegar?
DO NOT try to clean coins. Any home chemicals will damage the surface. If the coin had any collector value before cleaning, it will be worth only 1 cent afterwards. If you want to experiment with ordinary pocket-change, that's OK, but you'll ruin a collectible coin by trying to clean it.
What did the penny become less than 100 percent copper?
In 1982, the composition of the U.S. penny was changed from 95% copper to 97.5% zinc coated with a thin layer of copper. This was done to reduce production costs as the price of copper rose above the face value of the coin.
Is the Canadian penny a pure substance or a mixture?
pure
What is the control on the penny water drops experiments?
In this experiment, the control group would be the penny! The independent variable is the substance/water on the penny, and the dependent is how many drops the penny takes.
What is the corrosion on a penny?
The corrosion on a penny is typically a greenish-blue substance called copper oxide that forms when the copper in the penny reacts with oxygen in the air and moisture. This process is known as oxidation and can give the penny a dull or tarnished appearance.
How does vineger clean a penny?
Vinegar is a weak acid. If I remember my chemistry lessons of 40+ years ago correctly the action of an acid on a dirty penny should produce some sort of salty substance and water and the penny will then appear clean.
What causes vinegar to rust a penny?
Pennies are made of zinc plated with copper. Copper reacts with oxygen and water to form copper oxide. This is the tarnish you see on pennies that have been in damp conditions. The only U.S. coins that can truly rust are the 1943 zinc coated steel cents.
What is the singular possessive of penny?
The singular possessive of penny is penny's, as in "penny's worth".
Why penny flattened by a hammer is a physical change?
It is a physical change, because it does not change in substance. A penny, whether in its normal state or flattened, is still a penny. Similarly, if you drop a watermelon and it breaks apart, that is also considered to be a physical change because it is still a watermelon. Things are considered to be chemical changes when the substance changes into something new, and is commonly classified as irreversible. When an object rusts, it is considered to be a chemical change. Chemical changes are associated with a temperature change, or a color change or bubbling or something of the sort. Physical changes deal with physical changes in state, for example, ice melting, or in the example you provided, a penny being flattened.
What is used to describe the number of atoms in a copper penny?
The term "Avogadro's number" is used to describe the number of atoms in a copper penny. This number is approximately 6.022 x 10^23, which represents the number of atoms in one mole of any substance.
A penny saved ia a penny wasted?
No, "A penny saved is a penny earned".
Is dropping a penny into a glass of water a physical change?
Yes
Can a copper penny and a copper large bell have the same density?
Yes, both a copper penny and a copper large bell can have the same density because they are made of the same material, copper. Density is a physical property of a substance and is determined by the mass of the substance divided by its volume. As long as the copper used in both the penny and the large bell is of the same purity and composition, they can have the same density.
What is Penny's last name in the book penny from heaven?
Penny's last name from Penny from Heaven, Falucci
