Is an iron nail rusting a physical change?
I am quite sure that rust is a chemical change. Rust is caused when oxygen atoms begin bonding with the iron in the nail, which makes it a compound instead of a pure element.
Over time an iron nail reacts with water to produce iron oxide or rust Which of the following is a signal that rusting has taken place?
Iron combines with oxygen to form iron oxide (rust). Water may serve as a catalyst in this process, as iron does not appear to rust rapidly in dry, oxygen rich air. You can accelerate the rusting process even faster by placing iron in acetic acid (vinegar). The chemical change occurs when iron combines with oxygen to form iron oxide.