Noun
- A chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994.
- An atom of this element.
- Molecular oxygen (O2), a colorless, odorless gas at room temperature.
- A mixture of oxygen and other gases, administered to a patient to help him or her to breathe.
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...Oxygen , from the Greek roots ὀξύς (oxys) (acid, literally "sharp", from the taste of acids) and -γενής (-genēs) (producer, literally begetter), is the element with atomic number 8 and represented by the symbol O. It is a member of the chalcogen group on the periodic table, and is a highly reactive nonmetallic period 2 element that readily forms compounds (notably oxides) with almost all other elements. At standard temperature and pressure two atoms of the element bind to form dioxygen, a colorless, odorless, tasteless diatomic gas with the formula . Oxygen is the third most abundant element in the universe by mass after hydrogen and heliumEmsley 2001, p.297 and the most abundant element by mass in the Earth's crust. Diatomic oxygen gas constitutes 20.9% of the volume of air. Read full entry
This entry is from Wikipedia,the leading user-contributed encyclopedia.It may not have been reviewed by professional editors(See full disclaimer)
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xygen
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oxygen??????
whats better for oxygen
therapy a oxygen mask or nasal
cannula?
(i need it for my asthma)
plz hurry!?
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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 |
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How is oxygen the 3rd most 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?
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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 |
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Can an Oxygen which is double 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?
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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.) |
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I want to purchase the most ecinomical oxygen generating system for personal use. I have been diagnosed with copd and am on a disability pension so I cant aford much
how do we get oxygen supplied for travel on an airline/plane? I need oygen when I fly in a plane. How can I get a medical form to give a doctor for this type of prescription?
Help
Requesting the application form to give to my Doctor reqesting use of my Inogen One on your (Jet Star) Qantas Flt. 385 Mar 24. I do not need oxygen tanks as my Inogen One Concentrator purifies air and delivers oxygen to me. It is small,fits under the seat and runs on batteries or can be connected to a power port. It is approved by Qantas Airways, Air New Zealand and FAA
what is oxygen diplition?
how is oxygen diplition
caused?
how can oxygen diplition be
controled?
what are its harmfull
effects?
main reasons for oxygen
diplition?
things responsible for oxygen
diplition?
when will it become exess?
how can students play a role
in controlment of oxygen
diplition?
does it cause any effect to
new born babies?
does the embryo get effected
by the diplition of oxygen?
where are the receptors that detect a decrease in the oxygen level of the blood located in the body?