Answers

2015-09-27T23:30:40+05:30
Mixing iron filings with sulphur is considered to be a physical change because the mixture can be easily separated  and no new substance is formed .
Moreover, no energy change occur while mixing iron and sulphur.
When the mixture is heated , the two substance combine to form a new substance known as ferrous sulphide .
The original substances iron and sulphur cannot be re_obtained by cooling ferrous sulphide . consequently, it is a permanent chemical change involving a energy change.
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  • Brainly User
2015-09-28T13:49:43+05:30
it will lead to the formation of Iron Sulphide 
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