Question

on heating a mixture of iron fillings and sulphur powder in a China dish ,colour of residue formed it​

Answer 1

Answer:

When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance which has properties entirely different from Fe and S.Therefore, heating of mixture of iron and sulphur powder is a chemical changes

Answer 2

Answer:

Explanation:

When Iron fillings and powdered sulphur are heated in a China dish, they undergo a chemical reaction to form a new product, called Ferrous Sulphide (FeS).  

This new compound shows properties that are different compared to Iron and sulphur. This is noted by the fact that Iron is dark grey in colour and sulphur is a yellow powder, whereas FeS is a metallic black solid.