For example hydrogen and oxygen are both gases at room temperature, but water is a liquid. The reaction between iron and sulphur to make iron sulphide is often used in school to study elements and compounds.
Keeping this in consideration, what is iron and sulfur mixed together?
The two solids are mixed and heated in a test-tube (or ignition tube). The reaction can be used to illustrate elements, mixtures and compounds. This demonstration or class experiment shows the exothermic reaction of two elements, iron and sulfur, to form the compound, iron sulfide.
What happens when you heat a mixture of iron and Sulphur?
When iron filings and sulphur powder are mixed, both retain their properties. It means they have not undergone any chemical reaction. When this mixture is heated, they undergo chemical reaction and form ferrous sulphide (FeS). This compound cannot be separated using a magnet.