Question

when iron fillings and sulphur powder is heated strongly , a black mass of iron sulphide is formed identify the type of change and give reason

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 change

Explanation:

Answer 2

It is a chemical change s new substances are being formed by breaking and making of chemical bonds.

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

Example: Melting of ice

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: $Fe+S\rightarrow FeS$

Thus when iron fillings and sulphur powder is heated strongly and a black mass of iron sulphide is formed is a chemical change.

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