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Tro, Principles of Chemistry: A Molecular Approach<br />
24<br />
Chemical Changes in Matter<br />
The rusting of iron is<br />
a <strong>chem</strong>ical change.<br />
The iron atoms in<br />
the nail combine<br />
with oxygen atoms<br />
from O 2 in the air to<br />
make a new<br />
substance, rust, with<br />
a different<br />
composition.
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