homework help: find the answers for “How might you separate”: - Help.com

I’m asking for some science experts to help here…

Although sand and gravel is easy. Pour the mixture over a sieve and the sand will fall through while the gravel rocks stay on the wire mesh.

Several of the things you can separate by fire. (Melting)

Others you can separate my bouyancy (stryofoam and water)

and some you can separate by weight (say nitrogen and oxygen)

magnet, shifter,water, ummm heat?,an alcoholic, and chemist?

salt and sugar… is that one static elec. or something crazy like that?

lungs for the last one

so it’s magnet,shifter,water,electricity,liver,and lungs…
right? :)

OK, I think most of these have been answered before I got the notice but I’ll make a suggestion on the salt and sugar one.

First of all, these two suggestions may or may not work, I’m not 100percent positive.

If you pour gasoline over the mixture, the sugar should dissolve, but not the salt. Then once the sugar has dissolved you can filter out the salt crystals. Once they are removed, allow the gasoline to evaporate and it should leave you with sugar crystals. BUT, it may be something like paint thinner that does this, not gasoline. I can’t remember. But either way, its dangerous, only do it under supervision.

The only other way that I can think of, and I’m not sure if it will work or not either, and it will take a while, is this..

Dissolve the sugar and salt mixture in water, boiling water of course. Make sure you use enough water that all the crystals are dissolved. Then, once the mixture is dissolved, wet a piece of string and suspend it over the mixture and allow it to rest inside the mixture slightly. Put the mixture and string in the refrigerator and allow it to cool, don’t disturb it. Over a few days, you should have a huge sugar crystal attached to the string. Once the crystal has stopped “growing”, take it the string out along with the sugar and heat the remaining mixture until all the water has evaporated, you should have salt remaining.

One of those may work.

Oh and on the two gases, if you have an incredible freezing machine, you can seperate them by freezing as they both have different melting points. Once the nitrogen freezes then release the oxygen.

Other than that, I think the lung suggestion is the best.