Oxidation and corrosion tarnish pennies
It is a chemical change. Jewelry that tarnishes undergoes oxidation.
it tarnishes
oxygen
Yes copper tarnishes !
pennies don't rust, they're made of cooper, rust is iron-oxide (meaning it has iron and oxygen in it). But copper oxidises (tarnishes). so a liquid with a high oxygen content would work
copper?
It tarnishes a ten yo boy
copper
Chemical change
Chemical change
Chemical change
the bank!