Question

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)
Responses

The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.
The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.

There are more iron atoms in iron oxide than in pure iron.
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 iron atoms in iron oxide have more mass than pure iron.

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

Answer 1

The correct statement that explains the difference in mass when iron rusts and forms iron oxide is:

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

This is because rusting involves the combination of iron with oxygen from the environment, resulting in a compound (iron oxide) that contains both iron and oxygen atoms, thus increasing the overall mass compared to pure iron alone.