If solid go directly from solid to gs, it call sublimation.  Now what do you call if gas go directly to solid?  what do you call it?
137373
Deposition is the answer.  Sublimation only refers to the process of solid going to gas.
641416
gas cools down if it expands suddenly.\n\nsimilar principle is used in AC and refrigerators.
447358
Iodine sublimes which means it moves from solid to gas directly at a certain temp. and pressure.\n\nBut if you increase the pressure for example and hold the temp. the same eventually you will get liquid iodine.\n\nIce also gives off vapors yes but ice's tripple point (the temp and pressure at which all three states of matter can co-exist) is farther below the normal pressure (1 atm) than iodine so we don't see ice sublime as reatily. Also water has very strong intermolecular forces that want to prevent it from subliming under normal conditions.
340679
well good luck doing that....air is gaseous....\n\nor did u mean how would you remove a specific gas such as oxygen or nitrogen from air....\n\nwell one way we remove oxygen is by breathing in...and one way to remove nitrogen from air is nitrogen fixation.
270783
Oxygen aton as such called as "Nascent Oxygen". It is highly reactive and powerful oxidising agent.\n\nO2 is oxygen "molecule"... the roperties of this will be different than "Nascent" Oxygen!\nGood luck with u r school project!
158619
when a solid turn directly into a gas without melting... dry ice sublimates...
307415
What is "Dry N2 gas?"  My chemistry's a bit rusty, but here's what you might do:\n\nYou take your 40 liters and with the 22C and .956atm, you can determine how many moles of N2 you have.\n\nThen, you take those moles and apply it to whatever "Dry N2 gas" means.  My best guess would be STP.  Then you find the volume at the new temperature and pressure.
298805
answer can be a or c, but i'd go with answer c.\n\nthe melting point (which solid becomes liquid) varies by each molecules & substances.  What happen is when temp. rises, it translates into more energy put into the soild or heat absored by the solid.\n\nHowever, you can melt solid by chaning pressure, and leaving temp constant.\n\nSo best answer would be C, by heat absorption.
219585
I know of at least 4 ways.  I think that the distillation or membrane separation are the most practical.\n\n(1)Distillation\nOxygen and nitrogen have different boiling points.\noxygen: 90 K\nnitrogen: 77 K\nIf you cool the mixture to a temperature between the boiling points of each you will be in a two-phase region.  There will be a gas phase rich in nitrogen (because it has a lower boiling point) and a liquid phase rich in oxygen.  A distillation column can be used to separate the phases and collect them in a continuous, pretty efficient process.  I think you have to do something special about the argon in air when you do this (like have more than one separation step, more than one distillation column).\n\n(2)Adsorption\nOxygen and nitrogen gases may adsorb to (stick to) the surfaces of certain compounds (like metal surfaces).  If you make a series of tubes lined with a substance that preferentially adsorbs (for example) oxygen, you will get a gas output that has less oxygen in it.  In a well-designed case, the adsorption is reversible.  Increasing the temperature of the substance will causes the oxygen to leave the solid surface and once again become a gas, giving you a relatively pure oxygen stream.  If the purity is not good enough, you can collect the streams and repeat the process (use a longer tube).  I don't know of an example of an adsorption material off-hand.\n\n(3)Stripping\nStripping is the process of passing a gas through a liquid and may involve chemically removing one of the components of the gas.  If you bubbled air through a liquid that had a chemical in it that reacted with oxygen to form a compound then the gas that reaches the top will be nitrogen-rich.  For example, your blood contains hemoglobin, so that when it is in contact with the air in your lungs the oxygen sticks to the hemoglobin, forming a chemical complex.  This is a lot more effective than limiting yourself to an oxygen supply based on whatever gases can dissolve in your blood. \n\n(4)Membrane Separation\nOxygen and nitrogen have different permeability in membranes.  They can diffuse through solids, but at different rates.  I think oxygen typically has high permeability.  If you pressurize the gas mixture and pass the gases through a bundle of tubes (high surface area is key) then some gas will pass through the tubes axially and some will diffuse through the walls radially.  The stream that passed through the tubes will be richer in nitrogen, since it is less permeable.  The stream that diffused through the walls of the tube will be richer in oxygen, becuase it is more permeable.  Repeat the process to get the desired purity.\n\nAn artificial lung can be made by passing blood through a long set of tubes that have oxygen on the outside of the tubes.  The oxygen diffuses into the blood through the permeable tubes.
587186
Actually you're right.  When F2 was initially isolated, it kept reacting w/ the storage vessels...displacing other less electronegative elements (like Cl).  Eventually someone figured out to use a flourinated salt for storage, and voila, isolated AND stored.\n\nToday there are materials that are virtually inert to F2, but that's because chemistry progressed w/ clever ideas like the one above.
492290
GC is gas chromatography, an analytical instrument used to isolate/identify organic compounds.\n\nThe packing in the column and the treating liquid is the stationary phase, while the inert gas flowing byu is the mobile phase.  Molecules are sorted accoding to their degree of interaction with the stationary phase.
444854
The answer should be A.\n\nAverage kinetic energy of a substance is related to the speed of the particles moving in it and the temperature of the substance.\n\nAs the particles in the a substance moves faster, the average kinetic energy of the substance increases.  So does the temperature.\n\nWhen a substance changes phase, the temperature will remain constant.  This means that the average kinetic energy is also constant during this process.  Hence, B is wrong.\n\nWhen thermal energy is being transferred out of the substance, one could understand it as taking out some particles out of the substance.  So what is changed here?  I would think that the total kinetic energy is being changed, since some particles have been taken away.  But the taking away of the particles would not affect the speed of the remaining particles.  The AVERAGE kinetic energy should remain unchanged.  Hence, C is also wrong.
99365
Don't forget...also in earth science (weather)\n\nDeposition in science can also mean going directly from a gas to a solid (i.e. frost on the ground).\n\nDeposition is the opposite of sublimation which is going directly from a solid to a gas. (i.e. dry ice)\n\n:)
373407
If the dry ice is to sublimate, the room you keep it in will have to ADD heat to the dry ice, so the answer is dependent on the rate of heat flow into the room.  If it were perfectly insulated, the ice would sublimate only to the extent that the interior was cooled to the temperature of the ice, after which all heat transfer and change of state would cease.  BTW sublimating is not 'melting'\n\nEven without the room, the time to sublimate would not only depend on the ambient temperature, but also the geometry of the ice, a sphere taking the longest time and a thin plane of ice taking the shortest.
276162
Ack... Munir got here before I did agian.  A agree with Munir!  Volume of any gas at STP is 22.4L.
494784
if u are referring to expansion due to heating than the order of expansion of the substances from lowest to largest is solid, liquids, than gases. But a solid's expansion is extremely low, almost impossible to measure unless its a metal.
491258
Work out the moles of carbon dioxide.\nWork out the heat of sublimation of that many moles.\nSet delta G = 0 because it's a change of state.\nSo delta S = delta H/T\nBut convert delta H to Joules before you do the calculation!