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One possible way to separate wooden marbles from glass marbles is by using a magnetic field. Since wooden marbles are typically not magnetic, while glass marbles are also not magnetic, one can use a strong magnet to attract and separate the wooden marbles from the glass marbles. The magnet will attract the wooden marbles while the glass marbles will remain unaffected and can be easily sorted out.
Chromatography
Either: 1) Find the radius of each marble and thus their volume through V = 4/3 x pi x r^3 and then add the volumes up. or 2) Put all the marbles in a measuring jug and fill it up to the top. Pour the water into a separate container and empty the marbles out of the jug. Pour the water back into the jug. Thus: Volume of water with marbles - volume of water without the marbles = volume of marbles
He will have 13 blue marbles and 10 green marbles.
12 blue marbles
Separate them by colour
One possible way to separate wooden marbles from glass marbles is by using a magnetic field. Since wooden marbles are typically not magnetic, while glass marbles are also not magnetic, one can use a strong magnet to attract and separate the wooden marbles from the glass marbles. The magnet will attract the wooden marbles while the glass marbles will remain unaffected and can be easily sorted out.
Because you can separate seashells and marbles with your hands and you can't with copper sulfate
using a screen
Use a magnet.
Visual - the clue is in the question! Or use a magnet, assuming the steel marbles are not of a non-magnetic grade of stainless-steel.
I don't
You have to pick them up
Examples: colloidal gold, milk, mist, styrofoam, fog, mayonnaise, cosmetic gels etc.
Put them in water.
That will depend on the size of the styrofoam pieces. If they are significantly larger than the sand, you merely pick them out by hand. If not, then a sieve can be used assuming the sand will go thru the sieve and the styrofoam will be too large to pass through. You need to find a sieve with the right size holes. Another way is to add acetone and the styrofoam will dissolve, and the sand will stay behind, but this technique doesn't give you the styrofoam back again.
Sand and marbles would not be a solution. A solution has a solute (a solid) and a solvent (a liquid). You must also not be able to just separate the two. Sand and marbles would not be a solution because you can simply pick out the marbles, and there is no solvent!