Question

When iron filings and sulphur powder is heated strongly in a boiling tube, black mass of iron sulphide
is formed. name the change​

Answer 1

When iron filings and sulphur powder are mixed, both retain their properties. It means they have not undergone any chemical reaction. Therefore, mixing of iron and sulphur is a physical change.

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 change.

Behaviour towards a magnet---Iron filings cling to magnet.No particle attaches to magnet.

This change is a chemical change.

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Answer 2

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 change. ... This change is a chemical change.