why can a solution sit almost indefinitely without separating?
827546
Because this system has reached the maximum entropy value.
372176
Sounds like you've got too much time on your hands to me!  The ions in solution keep the water molecules farther apart from eachother on average than they would be in pure water.  Therefore the hydrogen bonds are weaker and the water will boil at a lower energy level.  At least that's what I'd guess.
687306
Check the Michaelis-Menten equation.It's too long to write it all down for you ;)
286716
divide it by as much as you like ... let's say you can make it yield to infinitely small.\nthink of it this way : why should there be a "limit"?
547891
Whe water sit stationary in a container undistured, the surface of the water will have a certain surface tension that act somehow like a piece of paper that can hold certain weight that rest on it. Dust which is basically made up of very light particles will settled on the surface and remains on it since the weight is not enough to overcome the force of the surface tension forming the water surface. However, if u try to add in surfactants such as soap into the water and compare it with just pain water alone, u will notice that the dust film develops faster on the plain water! This is so since soap or detergents acts as a surfactants that can break or reduces the surface tension force of water hence more dust particels can actually break through them and as a results less dust film form on it!!!
459336
That is too vague a question. There will be different answers if you mean what will happen if a cell is placed in a liquid SOLUTION which has more of a specific substance than the cell. It will also be different if the solution you are talking about is simple air or only one gas.\nGenerally, however, the cell will attempt to balance the pressure within its membrane and outside its membrane in order to stop itself from exapnding so much it rips it self apart (There are only a certain number of lipids in the lipid bilayer of cells, and if the surface area of the cell increases too much, they will not be able to keept in contact with each other and therefore keep the membrane intact) or becomming squished because it cannot counter the outside pressure and is therefore forced to fold in upon itself.
929951
Because you have to know which is the top and which is the bottom layer. \n\nFor example, if you're using diethyl ether to extract something from water, the density of water is 1.00g/mL and of ether 0.71g/mL. So if you shake up a mixture of water and ether, the water will settle to the bottom and the ether will collect on top. You open a stopcock ("faucet") on the bottom of your vessel and let the water drain out and stop before the ether goes. \n\nIf you're using chloroform to extract from waster, the density of chloroform, is 1.48. So after shaking, it's the chloroform that winds up on the bottom.\n\nThe other solvent should not be too close to 1.00g/mL, because you'll get a liquid mush that doesn't separate into layers.
183163
If you have two magnetic rings (that have two opposite sides) you put them through a straw. One ring levatates above the other because of the force that pulls them apart. It's kind of hard to explain. I hope this makes sense.
552084
I assume this is based on the principle of Osmosis. I would like a bit more data before answering further.
961464
i think it's because in solid states, the electrostatic forces keep the positive and negative ions together.  but when placed in water, the ions separate, free to move about in the water.
1159168
Glue and a solvent reside in a bottle of glue. The solvent keeps the glue from sticking inside the bottle.\n\nWhen you squirt the glue out of the bottle onto a piece of paper or a broken china cup, the solvent gradually evaporates, allowing the glue to get sticky.\n\nThe solvent molecules bounce and jiggle at the surface of the glue-solvent mixture and some get enough energy (when neighbors slam into them) to escape. That's evaporation. Outside of the bottle, few solvent molecules remain near the spread glue to hit it and renter the mixture. So, gradually enough solvent molecules leave the mixture that the glue gets sticky.\n\nIt's different in the capped bottle. The solvent molecules evaporate inside the bottle-just as they do outside the bottle when you spread the glue. However, once airborne they don't have far to go. They're trapped in the bottle. Some of the solvent molecules near the surface of the glue bop into and reenter the glue. That's condensation. Gradually--as more and more solvent molecules crowd into the airspace above the glue-solvent mixture--more and more solvent molecules reenter the mixture. Until, eventually, as many solvent molecules leave as reenter and the mixture reaches equilibrium.\n\nGlue manufacturers make sure the glue mixture stays runny by choosing a sufficiently small air space when they fill the bottle. You may have noticed that old glue in an almost empty bottle gets viscous or even solid. It's a good idea to buy only enough glue for use in the near future.\n\nAs far as sticking to the bottle is concerned, here's the poop from Elmer's glue: "If it were to dry out or harden, it would form a very weak bond with the special nonporous plastic used to make the bottle and could be de-bonded or removed easily," says Robert Thompson.
95223
forcing water away because they are polar molecules
627599
Ksp is a value dependant on the solute and solvent, (and temperature and pressure), and it determines the molar solubility. It is NOT affected by the amount of solid in the area.  And the solubility formula doesn't have the concentration of solids in it, does it, so that shouldn't be a factor in the amount dissolved.  So, it stays the same.  Does that make sense?  If not modify the question and I'll explain more.
834163
Just keep dissolving it until it can no longer be dissolved anymore.  Then it saturated.  \n\nUntil it reaches that level it is an unsaturated solution.
134473
The answer is obviously (A). The bar may shrink a little, but it can't disappear completely, as the options B, C and D imply!!\nHence, by process of elimination, the answer is (A). :-)
103662
true solutions will not settle
516306
Until the concentration of salt is large enough to form a saturated solution, ie. one in which no more solute will dissolve, the volume of the solvent (water) will not change.  20g of salt is not nearly enough to form a saturated solution, so the water level will remain at 500ml.