Which statement describes a chemical property of iron? (1) iron can be flattened into sheets.(2) iron conducts electricity and heat.(3) iron combines with oxygen to form rust.(4) iron can be drawn into a wire.

The correct option is 3.
In the presence of oxygen, iron will react with water to form rust. This is a chemical reaction and it is one of the chemical properties of iron.
Chemical properties refers to those properties of a substance, which can be used to identify it chemically, that is by reason of chemical reactions. Examples of chemical properties are reactivity with water, heat of combustion, electromotive force, pH, etc.

We can’t you if you only tell us that you have to show us what the answers are

You know how the first one if filled up like the objects do the same but with the other categories