Btw this a 2 question test there will be 2 things to answer
william finds a piece of pure iron in his garden. after a few days, the iron begins to rust. what are the two types of substances involved in the rusting process of iron?
iron is
a a compound
b an element
c a mixture

with one kind of atom that combines with oxygen from the air to form rust (iron oxide). rust contains two types of atoms, which means it is
a a compound
b an element
c a mixture