Answer:
C. Iron combines with oxygen to form rust.
Explanation:
The correct answer is "C" because it refers to the ability to rust, a chemical property, because rusting is a chemical change.
Answer choice "A" is incorrect because it refers to malleability, the ability to be flattened or pressed into sheets, a physical property. After being flattened, the iron would have gone through a physical change, not chemical.
Answer choice "B" is incorrect because it refers to conductivity, the ability to conduct electricity and heat, a physical property. The iron does not experience a chemical change while conducting.
Answer choice "D" is incorrect because it refers to ductility, the ability to be made into wire, a physical property. The iron is not going through a chemical change as wire.
= 6.02x10⁻⁶