0
Exposure to oxygen in the air, quite simply.
US cents have been made of copper-plated zinc since 1982, and before that most of them were bronze containing 95% copper. In either case the copper combined with O2 to cause discoloration.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agothe penny gets rusty
Add your answer:
Earn +20 pts
What causes tarnish?
Tarnish is oxidation caused by exposure to air.
What causes rust on copper?
It's probably oxidation, not rust.
Iron combines with oxygen in the air and causes?
Rusting - oxidation- corrosion.
What causes rust on a knife?
Rust is a reaction of iron oxidation in the presence of water.
What happens when you put a penny in vinigar?
Vinegar contains acetic acid. The acid reacts with the outer layer of the penny, which is usually very dull because of oxidation, and removes that layer leaving a new, shiny layer from beneath.
What chemical weathering called oxidation causes and nbsp?
what chemical weathering called oxidation causes
What type of weathering makes iron change colors?
oxidation causes iron to change color. oxidation causes rust.
What causes boat oxidation?
-Waves
Why doesn't the penny get clean with water?
Water doesn't react with the oxidation on the coin.
What causes tarnish?
Tarnish is oxidation caused by exposure to air.
What causes rust on copper?
It's probably oxidation, not rust.
What chemical weathering called oxidation causes?
Rust -Jeff
How can bromine oxidation harm the ozone layer?
Bromine oxidation causes ozone depletion. Bromine utilizes the oxygen from ozone to deplete it.
Iron combines with oxygen in the air and causes?
Rusting - oxidation- corrosion.
What can cause a chemical change of iron?
oxidation causes rust to form
What causes artifacts to rust?
Rusting is the oxidation of iron in a humid environment.
What causes chemical weatering?
Chemical weathering is caused by chemical reactions in the substance, for example, when oxidation causes rusting.
