Oxygen

Question: oxygen?????? whats better for oxygen therapy a oxygen mask or nasal cannula? (i need it for my asthma) plz hurry!?

Answer: An oxygen mask. A guy my mom used to date slept with one on for a few months and he improved about...70% doctors told him

Question: oXYGEN??//? DESCRIBE 6 WAYS OXYGEN IS REMOVED FROM ATMOSPHERE

Answer: Humans Trees inorganic, organic consumption Cars machines All living organisms take in oxygen, machines also, due to the fire combustion chamber, fire needs oxygen to burn.

Question: OXYgen...!!!!!!!!? Calculate the number of moles of oxygen gas produced from the complete catalyzed decomposition of 5.60ml sample of a 3.5% solution of H2O2. The density of the 3.5% solution of H2O2 is 1.01 g/ml.

Answer: Hai Thanu§hree, The reaction involved is: 2H2O2 ----> 2H2O + O2 Means, each mole of H2O2 gives 1/2 mole of O2. So, let us find the number of moles of H2O2 in the solution. Mass of H2O2 solution = Volume * Density = 5.60 * 1.01 = 5.656 g Mass of H2O2 in the solution = Concentration of H2O2 solution * Mass of H2O2 solution = 3.5% * 5.656 = 0.19796 g Moles of H2O2 in solution = Mass of H2O2 / Molecular Wt. of H2O2 Molecular Wt. of H2O2 = 2*Atomic Wt. of H + 2*Atomic Wt. of O Atomic Wt. of H = 1.00794 g·mol−1 Atomic Wt. of O = 15.9994 g·mol−1 Molecular Wt. of H2O2 = 2*1.00794 + 2*15.9994 = 34 g·mol−1 .....(approximated) Moles of H2O2 = 0.19796/34 Moles of O2 liberated = (1/2)*(0.19796/34) = 0.19796/68 = 0.0029 moles __________&&&&&&&_________ ♪ ♥ ♪ ♥ ♪ ♥ ♪ ♥ ♪ ♥ ♫ Saare Jahaan Se Achcha Hindustan Hamara ....... ♫ ♥♪ ♥♪ ♥♪ ♥♪ ♥♪ ♥♪ ♥♪

Question: Can an Oxygen which is double bonded to a Carbon, and nothing else have sp2 hybridisation? I have a molecule, and part of it has an Oxygen which is double bonded to a Carbon, and no other bonds on the oxygen. My teacher says it has sp2 hybridisation, but I don't understand why. O=C is the bond I am examining, and I am supposed to tell what kind of hybridisation the oxygen exhibits. Thanks for the help. I am asking only about the hybridisation of the oxygen. I already know the hybridisation of the Carbon. Why does the oxygen have sp2 hybridisation?

Answer: A previous poster said: "Again, if you are talking about the hybridization of two atoms that are bonded together, the hybridiation of each of those two atoms has to be the same, by definition. Therefore, if the hybridization of a carbonyl carbon is sp2, then so is the hybridization of the carbonyl oxygen..." False. And patently nonsensical. Consider propene. Carbon 2 is trigonal, double bond to C1, single bond to C3, single bond to H, sp2 hybridized. It's connected to C3, tetrahedral, single bonds to C2 and three H atoms, so it's sp3 hybridized. Two atoms bonded together with different hybridization. So. Well, draw the Lewis structure, what do you see on the O? A double bond to the C and two lone pairs. Now, VSEPR doesn't tell you explicitly what should happen there, because VSEPR is meant to rationalize the relative position of atoms, not lone pairs you can't see, but an extension of the VSEPR model would suggest that 1 BP + 2 LP would give a trigonal arrangment of electron pair regions, that the "angle" between the LPs would be about 120º. If so, then you'd need sp2 hybrids on O to hold those LPs at those angles, and leave one p orbital available for pi-bonding to C. So you could interpret it that way. Problem. I can offer an alternative, and you have no way to prove it wrong. I can say, no, the O doesn't hybridize. I use pz to make the sigma bond to C, I use px to make the pi bond, I put the two LPs in py and the s orbital. You cannot see the lone pairs, you cannot measure the angle between them, so you cannot know whether my description is better or worse than yours. Can the O be sp2 hybridized? Sure, that's one possible interpretation. Do you know that for certain? No, you don't. More importantly: it doesn't matter. The only reason you invoke hybridization, the ONLY reason, is to rationalize experimentally observed bond angles and bond strengths. Invoking hybridization at O doesn't tell you anything, doesn't explain anything, because there are no angles to observe. You need to invoke it at C, and you need to do it correctly or you predict a result that doesn't happen, but the two offered explanations for hybridization at O (sp2 or none) cannot be distinguished based on the structure of the compound itself. So. Call it sp2 if you like, but if you're feeling mischievous, ask your teacher to prove it, and justify that interpretation, to offer evidence that makes it a better interpretation than that of "no hybridization at O". Because there isn't any. Hybridization is a rationale after the fact, an attempt to explain oberved bond angles -- in the absence of any angles, there's no reason for it. (And, incidentally, the photoelectron spectrum of a ketone, which measures electron energies, better agrees with the no-hybrids at O scheme. The two O LPs have different energies, which is not what sp2 at O predicts.)

Question: How is oxygen the 3rd most common element in the universe? I know that Hydrogen is the most common, then Helium, then I heard oxygen was, but how is oxygen the most common, but shouldn't Lithium be the 3rd most common because it only has 3 electrons? I mean you only need to another electron to make lithium. You need 8 electrons to make oxygen so why is it the 3rd most common? Also what are the most common kind of bonds when hydrogen makes helium?

Answer: it has to do with the nucleosynthesis in each shell of a large star before a supernova 1st shell - H to He 2nd shell - He to C and O 3rd shell - C and O to Ne, Mg, and O 4th shell - Ne, Mg, and O to Si and S 5th shell - Si and S to Fe oxygen is produced in both the second and third shells, which is why it's more abundant than Carbon. hydrogen and helium are more abundant than oxygen even though theyre only produced in one shell because all active stars do the whole H to He conversion (including the smaller stars that don't get to the 2nd shell to produce O and don't have a supernova later on) btw you can see that Lithium isn't even a product of normal star nucleosynthesis, so that's why it isn't giving oxygen a run for its money

Question: What was the probable role of oxygen gas in the early stages of life's appearance on Earth? A. Cellular respiration, which depends on oxygen availability, provided abundant energy to the first life forms. B. Oxygen promoted the formation of complex organic molecules through physical processes. C. Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth. D. Abundant atmospheric oxygen would have created an ozone layer, which blocked out ultraviolet light and thereby protected the earliest life forms. E. The lack of oxygen forced organisms to develop cellular respiration.

Answer: C. Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth. That's the response your teacher wants anyway, although it's dumb to say that "absence" of something "promotes" something else. It would have been better to say that presence of oxygen gas would have prevented formation of complex organic molecules.

Question: How can I bring oxygen to a fish bowl without a filter or oxygen pills or pump? How can I bring oxygen to a fish bowl without a filter or oxygen pills or pump because my fish always goes to the top to take oxygen help!!!! It is a goldfish

Answer: how about you just tank care of your fish properly....and get it a real tank with a filter...your fish has no air edit: so it gets even better...a gold fish...a common gold fish gets over 12in each and need a min of 75 gallons and another 20-30 for each fish after that....and they put out about 2X the waste as most fish there size....please get this fish a proper tank or give to someone who will

Question: How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ from direct combustion? A. It is much easier to control the hydrogen and oxygen during direct combustion than during their reaction in a fuel cell. B. Much less heat energy is produced in a fuel cell than via direct combustion of hydrogen and oxygen. C. In the fuel cell, there is an oxidation-reduction reaction between hydrogen and oxygen. In the direct combustion of hydrogen and oxygen, there is no such reaction. D. The direct combustion of hydrogen and oxygen produces several different products, whereas the fuel cell produces only water.

Answer: 2H2 + O2 --> 2H2O .... The same reaction occurs in both combustion and a fuel cell. None of your answers are particularly satisfying, even the one that the question writer thinks is correct, which is (B). While it is true that much less heat is produced in the fuel cell, the question implies that there is less energy change in the fuel cell. That simply isn't true. The change in energy is the same regardless of whether the reaction occurs in an instant, as in the explosive combustion of H2 and O2, or over a much longer time, as with the exchange of protons and the corresponding movement of electrons, in a fuel cell. The only difference is the time interval over which the chemical change occurs, the rate of reaction.

Question: What are oxygen tanks doing in the cargo holds of airplanes anyway? That hole in the side of the Quantas jet last week was caused by an exploding oxygen tank that was stored in the cargo hold of the plane. Why are oxygen tanks in the cargo hold in the first place?

Answer: When you flew, do you remember this little safety speech about "in case of cabin depressurization, and oxygen mask would fall from the ceiling" bit? There are two ways to have oxygen in such conditions: 1- though oxygen generators (canisters filled with chemicals that react together and release pure oxygen when activated) 2- oxygen tanks Regulations require that pilots have a more reliable source of oxygen than passengers do (above a certain altitude, if a pilot has to be left alone, he has to don an oxygen mask); and since canisters release a lot of oxygen but only for a few minutes, this calls for the presence of oxygen tanks.

Question: How many moles of oxygen and what is the mass of oxygen? A room with dimensions 7.00m x 8.00m x 2.50m is to be filled with pure oxygen at 22.0 Celsius and 1.00atm. The molar mass of oxygen is 32.0g/mol. 1. How many moles (n_oxygen) of oxygen are required to fill the room? 2. What is the mass (m_oxygen) of this oxygen?

Answer: 1) Using the ideal gas equation n=PV/RT. V= 7*8*2.5=140cubic meter. R= molar gas constant which has a value of 0.000082 T= 22+273= 295 degree kelvin. P= 1atm. n=(1*140)/(0.000082*295) answer is approximately 5833moles. 2) 1 mole of oxygen weighs 32grams. Therefore 5833moles will weigh (5833*32)grams which equals 186656grams. I suggest you do the multiplications and divisions yourself as there might be errors in mine. Goodluck!

Question: What home oxygen companies are there in honolulu other than Apria? I'm a respiratory therapist and I'm moving to honolulu soon. I'd like to pick up some extra work for a home oxygen company. I know that Apria is in Aiea, what other home oxygen companies are there on the island?

Answer: Call Preferred and ask them. I get my oxygen from them in Nevada. If they don't, ask them if they know who does in Hawaii. If they don't know, call Apria, and ask Judith. She knows everything! Good luck to you! :)

Question: How do you add oxygen into and onto a benzene ring? I am looking for the reagents, the products, the conditions, catalyst if there is one and the method of producing it. Cheers. To elaborate on the oxygen I basically mean either C5O1H5, as in the oxygen is IN the hexagonal ring. Or C6O1H5 where an oxygen attaches to the ring in place of one of the hydrogens. But this complex is seen in a lot of complex organic molecules. So there must be some way of implementing it, even though the actual C5OH5 doesn't exist by itself.

Answer: The ring compound you are asking about does not exist and even if it did you would not be able to make it from benzene, There is a N variant of the compound you are suggesting called pyridine but again, you would not make this from benzene. http://en.wikipedia.org/wiki/Pyridine As ar as ring substitution goes I am going to guess at your study level and suggest the following Benzene ----> Nitrobenzene ----> Aniline ----> Phenol EDIT: I assume you mean this structure which does not exist on its own but as a salt. It is not made from benzene though. http://en.wikipedia.org/wiki/Pyrylium

Question: How to add oxygen to atmosphere in mass quandities other than evaporation and emissions from vegetations? Everyone and all countries grabing oxygen for their own benefits. Believe proportin of oxygen gone much less in atmosphere and another reason for global warming.

Answer: There aren't any other ways to do so in large quantities. Pretty much any method available to us would do more damage than good, or in other work we can make oxygen, but the energy need to do it would outweigh the benefit.

Question: How do you remove an oxygen sensor that is stuck on the car? My dad is replacing the oxygen sensor on my car, and it is stuck. It is the original oxygen sensor, and he said that it is seized to the pipe. He has tried the penetrating oil, and an oxygen sensor wrench, and still no luck. He said that his next step is to use a torch. Will this work and do you have any other suggestions or ideas on how to remove it? Thanks!

Answer: The heat works and is the best solution but F.Y.I. he will actually heat the pipe around the sensor. Metal expands when heated so by applying heat to the pipe the metal is expanded, and the threads are actually pulled away from the sensor. There is only a short time before the metal starts to cool so time is important. Also, it is a good idea to remove the sensor by screwing in a little then out. This helps prevent the threads from stripping.

Question: What is the difference between oxygen and a free radical? Why is oxygen in the form of a "free radical" bad, but oxygen in general clearly essential for life? What is the difference? My understanding is that the free radical has one electron that is not paired and thus makes it reactive. So how is stable/nonreactive oxygen used by the body?

Answer: Normal O2 is actually a radical, because it has 2 unpaired electrons. That is why pure oxygen is both toxic and highly reactive, and people should not breathe large doses of pure oxygen for long times. These free electrons, however, allow the binding of oxygen to our red blood cells, and allows for proper transport. Our bodies are able to use certain amounts of the free oxygen; higher concentrations become dangerous. Other free radicals are not handled easily by our bodies, and they are more likely to cause damage.

Question: what's the difference between an oxygen canister and oxygen generating cylinder, as in qf30 vs value jet592? i have read that the qantas flight 30 incident was the first aviation incident involving an oxygen canister or bottle. however, in 1996 in the US, valuejet flight 592 plunged into the everglades due to a fire caused by an oxygen generating cylinder. what's the difference between these two oxygen tanks? thanks to all of the answers so far, this is great information to me, i'm a bit of a commercial aircraft fan. how will i ever choose which one's best?! lol....:)

Answer: A bottle holds pressurized gas, just as you would see a mechanic take an airbottle out to a car/plane/trailer and fill up the tire with compressed air. The o2 generators utilize a chemical reaction that is initiated when the 3 chemicals are mixed... which occurs when you pull down on the mask. The resultant chemical reaction generates about 15-20 minutes of o2 for your mask. The problem with Valujet 592 was the generators when they fire off, exotherm up to around 500 degrees F and they were improperly rigged/packed/shipped... so the chain reaction created a fire that incredibly intense and brought down the aircraft.