Why is the mixture kept cool?
81309
So they don't seaparate.\nIn culinary terms emusification (of water and oil for example) must be done room temparature and immediately refridgerated.  Keep it warm and the sucker will "break."
444550
The difference in solubility of the components allows for separation.  I don't remember the specifics, but that is the reason.  Water will not have a big enough difference.
436735
Ice and water are at equilibrium at 32 F (0 C).  A mixture of water and ice cannot be cooled below this temperature.   Salt depresses the freezing point (which is why it is added to icy or snowy roads in winter), allowing lower temperatures to be achieved.  This makes the viscosity build of the ice cream (caused by churning of the mixture) to occur in a shorter period of time, and keeps the ice crystals that form in the ice cream smaller - resulting in a smoother texture.
130128
slowly cool the substance down so they will have time to excrutiate, the other substances out of them before freezing.
912323
Keeping it away from sulfides, which are present in many foods and to some degree in the atmosphere.  Keeping it in a sealed cabinet will help.
795677
cooling it or pressurized it
718884
&#92;\n..&#92;\n..-----&#92;\n........&#92;\n.........&#92;\n(ignore the periods)\nx axis: time\nY axis: temperature\nThe step is there because the nature of cooling objects. As the naphthalene is cooled, its temp first decreases normally. However, when it begins to solidify, the heat being removed is used up as naphthalene molecules are subjected to intermolecular forces and begin to become a solid. Therefore, the horzontal part is where the substance becomes a solid. Finally, when the naphthalene is fully a solid, the temperature decreases again. An easy way to picture this concept is with boiling water. As some water molecules change to the gaseous state, the temperature of the water does not rise above its boiling point. This is equivilent to the horzontal part of the naphthalene cooling curve. As the substance changes states, energy is being generated/used up, and the temperature does not change for a time. When the conversiion is fully made, the temperature continus on its original course.
968042
Boiling is vapour pressure phenomenon. A liquid always exerts a pressure in the space just above it due to evaporation of its surface molecule which is called vapor pressure of that particular liquid and as temperature is raised the vapour pressure goes on increasing. When vapor pressure of the liquid exceeds atmospheric pressure liquid starts to boil.\nin case of a mixture, the solute molecules bind the molecules of the solvent and thus there are fewer surface molecule available to evaporate from the liquid surface. Due to which vapour pressure exerted by a mixture is always less than vapor pressure of pure solvent. To make vapor pressure of mixture to reach the atmospheric pressure level its temperature should be raised more than temperature of solvent alone. Thats why a mixutre has a boiling point elevation.
96040
The phrasing is wierd, shouldn't there be a from between flow and the?\n\nIf two substances have different _temperatures_, heat will flow [from] the hotter [substance] to the colder [substance].\n\nThis is because heat, at the molecular level, is related to how fast molecules are moving. When a substance whose molecules are moving faster comes in contact with an object that's moving slower, the faster molecules will collide with the slower molecules of the second object, slowing down the faster molecules while speeding up the slower ones. Thus, heat (average kinetic energy of a substance) is transferred from the hotter substance to the colder one.
805898
Because the cooling device works harder to make the temperature consistent.
1004222
I believe it's cooled to prevent pre-detonation of the fuel/air charge in the cylinder. So, if you send the hot gasses back into the manifold without cooling, you'll get knocking in the engine.
465224
the colder the air the more dense it is and therefore the more oxygen it contains, but you will need to increase the amount of fuel otherwise the mixture will be lean and the engine will overheat.
360266
Not trying to get some help with a chemistry homework problem, are you?\n\n\nOkay, my guess is that the molecules of one of the liquids fit into the "gaps" between the molecules of the other.  Kinda like mixing a quart of pebbles with a quart of bigger rocks.  Since some of the pebbles with fit between the bigger rocks, the combined volume will be noticeably less than two quarts.
285773
A still works by taking advantage of the different boiling points for various liquids. For instance, alcohol boils at a lower temperature than water; therefore, you can heat a mixture of alcohol and water and the alcohol will tend to boil first. If you then condense the alcohol vapors, you have made a separation.\n\nThis is an over simplification because even with the alcohol as it vaporizes, some of the water also vaporizes. To make a purer product, you must repeat the process many times. A special column called a fractional distillation column permits you to make a nearly perfect separation
505721
Maybe Air packaging it will keep it from melting.
435235
I assume you mean mixtures like solutions where the components of each separate phase are distributed homogeneously (i.e. metal alloys, liquids, polymer blends) and the solution is at equilibrium.  \n\nPut simply, the main reason ternary (or binary or quaternary..) soltuions can remain separate has to do with the thermodynamics of the solution.  Under a given set of equilibrium conditions (temperature, pressure, etc.) different phases can form if they correspond to a minimum in what is called the free energy.  The free energy represents the balance between what are called enthalpic interactions (molecules/atoms interacting with each other or within themselves) and entropic contributions (the amount of disorder within the system).\n\nNote:  I've limitied my answer to a VERY rudimentary explanation.  There are other factors that determine whether phase separation actually occurs (i.e. kinetics).  I urge you to visit any of the many websites that can give a better explanation than I have given here.  For example, try to find links through www.acs.org.
823151
I don't really understand what your question is.  In the first place, heat always flows from a warmer object to a cooler one.  That maximizes the number of possible arrangements of energy quanta, leading to an increased entropy.