a student makes several observations about a piece of iron. which observation describes a chemical property of the iron?

A. it's mass is 52 grams.

B. it's density is 7.9 grams/centimeter³.

C. it rusts when exposed to air.

D. it conducts electricity.

please ignore this question as it being in the wrong category, it was an accident as my phone was being laggy wjsjwnndnwn