1) A mixture of non-magnetic materials and iron
Method: Use a magnet
2)A mixture of water, a solid that can dissolve in water and a solid that cannot (eg. water, salt and sand)
Method: filter the mixture to remove the sand, then use distillation to separate the salt and the water
3) 2 liquids that do not mix (eg. water and oil)
Method: Slightly more complicated. There is a special machine built to do so. It is called the API oil-water separator. You can find out about it in Wikipedia at this site: http://en.wikipedia.org/wiki/API_oil-water_separator
4) Air and petroleum
This is definitely more difficult... There is a special type of machine that is used. It is big, bulky and complicated. You can see it at these sites:
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