Question

balance of atoms quick check
when iron rusts and forms iron oxide, the iron oxide has more mass than the iron. which statement correctly explains this difference in mass? (1 point)
there are more iron atoms in iron oxide than in pure iron
the iron atoms in iron oxide have more mass than pure iron
the oxygen atoms in iron oxide have more mass than the iron atoms in pure iron
iron oxide has oxygen atoms, and pure iron does not

Explanation:

When iron rusts, it reacts with oxygen in the air to form iron oxide. The additional mass in iron oxide comes from the oxygen atoms that bond with the iron atoms during the rust - ing process. Pure iron consists only of iron atoms, while iron oxide has both iron and oxygen atoms.

Answer:

Iron oxide has oxygen atoms, and pure iron does not.