Question

if you are giv)en a mixture of iron fillings and sulphur powder how will you separate the components

Answer 1

do this by wrapping the end of small bar magnet in a paper tissue and dipping it into teaspoon sized heap of mixture of watch glass the iron will b attracted and sulphur will remain on watch glass

Answer 2

The filings 'stand up', but the sulfur does not. This is because iron filings are attracted to the magnet but sulfur is not. This proves that the mixture is not yet a compound, and is a mixture, as it can be separated by physical means.


When it is placed in water?

The iron filings sink to the bottom but the sulfur floats to the top. There is also sulfur on the walls of the test tube. (Looks sort of like cauliflower when you try to push it in...) It separated, although not fully. There were still small chunks of sulfur in the iron filings at the bottom


What happens when heating?

    There is the smell of rotten eggs in the air that the sulfur is releasing as it is heated. (It's poisonous sulfur dioxide, which sulfur will become when chemically combined with oxygen [SO2]) The mixture of sulfur to iron filings is heated up in the crucible using the bunsen burner. 

    When we finally take the crucible off the flame and uncover the lid, a yellow substance is seen on the cover of the crucible; the lid. There is a hard residue at the bottom of the crucible which has a color which is neither yellow nor grey. The residue is iron sulfide. The iron and the sulfur have undergone a chemical reaction and have been chemically combined to form iron sulfide. 



Sulfur and iron filing experiment


When we try carrying out the experiments we did on the mixture before, the results were as follows:


In water:

The residue sank to the bottom, though some feebly floated for a while before sinking


Magnet:

Magnetized some of the residue


Why is this so?

Not all the sulfur and iron have been combined to form iron sulfide and hence some of the properties of iron / sulfur still remain. if all the sulfur and iron had been combined to form iron sulfide, the properties of the residue would be the properties of iron sulfide, which is an entirely different compound and possess different properties as iron or sulfide......
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