Answer
c. An iron bar rusts.
Work Step by Step
a. This statement describes a physical property. Density is a measure of the mass of a substance per unit of volume, it does not involve any chemical changes.
b. A platinum wire glows red when heated. This statement describes a physical property. The color change is due to the heating of the wire, it does not involve any chemical changes.
c. An iron bar rusts. This statement describes a chemical property. Rusting is a chemical change, it involves the reaction of iron with water and oxygen to form a new compound, iron oxide or rust.
d. Aluminum is a silver-colored metal. This statement describes a physical property. The color of aluminum is determined by the way light reflects off of its surface, it does not involve any chemical changes.
