Physical methods of separation, separate without destroying the substance. 

solution is used to separate someting that is soluble from something that is not soluble, without destroying either material. the non-soluble remains as a precipitate, & the dissolved is poured off with the solution 

filtering is also a physical method, for it as well does not perform a chemical reaction that converts the substance into a new material. dissolved materials pass throughthe porosity of the filtering medium, & precipitates do not

1 3 1
any answers? those are from the yahoo. :(