What Is the Green Stuff on Pennies?
What should you know about What Is the Green Stuff on Pennies? Explore the insights in this feature article.
When copper is exposed to oxygen, it forms molecules called copper oxide that make pennies look dirty. Pouring vinegar over the pennies helps break up this copper oxide and expose the pure copper on the penny. As the penny dries and is exposed to the air, a chemical reaction occurs and the penny turns green!
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
