how is the mixing of iron and sulphur a physical? why does it become a chemical change on heating? explain giving reason.
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Answer:
Chemical Change:
There are changes in properties of both on heating, they lose their magnetic power.
A new substance, iron sulphide is formed.
The heat energy is released when the iron and sulphur mixture is heated. The test tube becomes red hot.
The change is permanent, which means it cannot be reversed.
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Answer:
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).
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