Does iron in Iron Sulfide(Iron + Sulfur) still have the properties of Iron? How can you tell?

Question

Iron Sulfide is made by heating mixed (pure) iron and (pure) sulfur. This is chemical change.

Answer 1

Iron sulfide is a compound and compounds have very different properties from the elements from which they were formed.  

Iron sulfide will have different

-melting point

-boiling point

-conductivity

-density

-appearance

(and many others) from iron metal.

Answer 2

No, it does not.

You can test them. Heat it up. At what temperature does it melt? Not the same as pure iron. Does it get attracted to and stick to a magnet? No. Weight it and determine its density. Same as pure iron? No.

And so on.

Answer 3

This is one of the demos that I do early in the semester.  I have a student separate the iron from a mixture of iron powder and sulfur powder with a magnet (in a sandwich bag to keep the Fe off the magnet).  

After the reaction we repeat that test and find that the FeS is not affected by the magnet.   The iron compound has its own set of physical and chemical properties that may be very different from the properties of the iron and sulfur.