Oxygen Definition and 376 Threads

On Earth, fire needs oxygen. If space has no oxygen, how does the sun continue to burn? Thanks! :) Ω

Homework Statement "Calculate how much energy that is required for a oxygen atom 168O to split it up into 4 α-particles" The Attempt at a Solution 1: (8 * 1,00727646688)u + (8* 1,00866491578)u = 16,12753105 u The first one is the Oxygen's 8 protons and the second one is its 8 neutrons...

Hi guys First things first, I'll lay out the problem. I have a box of volume V containing a constant sink of oxygen (e.g. a candle or an animal); this box is sealed except for a smallish aperture of area, A and depth, L (the L meaning the walls of the box have finite thickness). After a...

Over the last few days I have been studing combusiton reactions. I have found numerous papers that all state singlet oxygen can increase the combustion efficiency. My question is: Why is singlet oxygen not being used in todays automibiles? It seems to me the only issue would be...

1 - how does water rise to form clouds if oxygen is heavier than nitrogen? when it turns into a gas its hydrogen and oxygen---why does it rise (to form clouds) if oxygen is heavier than nitrogen, which makes up 78% of the Earth's atmosphere? *please note that I'm not confused as to the...

Homework Statement How much does 1m3 air (oxygen) weight with 10 bar pressure at 0 degrees celsius? Homework Statement 0 degrees Celsius = 273.15 kelvin The Attempt at a Solution I saw this formula on another thread: 1 atm = 101,325 pascals ~ 1.2 atm = 121,590 pascals 27oCelsius = 300.15 K...

Homework Statement 1. Estimate the concentration of oxygen in the Earth's atmosphere (in molecules / m^3), at room temperature and at sea-level, assuming the fact that oxygen comprises 21 percent of the Earth's atmosphere by volume. 2. If you were to place a perfect oxygen sensor of...

I posted in picture format to post on another website, but haven't found a reply yet:

Why do so many polyatomic ions contain oxygen?

why is average bond enthalpy of O2 is 495...But the formation enthalpy of O2 is 0 ?? Why are they different??

The angle of the water H2O molecule is 104.5°, the angle of ammonia H3N is 107°. The angle between 2 p-orbitals is 90°, the angle between 2 sp3 hybrid orbitals is 109°28', the tetrahedral angle. Why is it assumed that water is a "greatly" expanded p-orbital angle, rather then a "slightly"...

why cannot hydrogen and oxygen not used in internal combution engine as fuel? it would be pollution free.

Hi , If I used electrons to ionize Oxygen gas by accelerating the electrons and then collide with Oxygen molecules , What is the electron velocity needed to do this ionization ?

Homework Statement The oxygen taken in by the body reacts with fats, carbohydrates, and protein, liberating energy internally at a rate of about 2.180×104 J/L. If a 71.40 kg man requires 81.00 W of power even while sleeping, what is his rate of oxygen consumption? Homework Equations p=fv...

This isn't a homework problem, but rather a question that I thought about. Given a Formaldehyde CH_{2}O molecule, what would the hybridization of the oxygen atom be? I know that the hybridization of the carbon atom would be: C = \frac{\uparrow}{2sp^{2}} \frac{\uparrow}{2sp^{2}}...

Homework Statement Could one expect to get a good thrust off oxygen and hydrogen fuel in a gaseous form, pumped at ~60 PSI into a 2 liter container? How much (in terms of mass) oxygen and hydrogen would be in the said container at such a pressure, assuming we have a 2/1 hydrogen/oxygen ratio in...

Since algae can produce oxygen in closed containers, which you can inhale as a byproduct, when provided CO2 from your lungs; you could in theory take diving cylinders filled with algae with you, when diving, correct? I suppose this hasn't been done before, why not?

nitrogen has the outer shell coniguration of 2s2 2p3 and thus has 3 unpaired electrons.while oxygen has only 2 unpaired electrons.why is oxygen more paramagnetic than liquid nitrogen then?

Hydrogen, in the presence of oxygen, will combust when exposed to a heat source and form water. At least this is what I have gathered from some googling. But I haven't been given a satisfactory, detailed explanation as to why this occurs. Would anyone here be willing to describe this process to...

Hi everyone. I have been presented with a problem- to produce a set amount of pure, dry oxygen in any way I can, provided it is safe and accessible. I have chosen to tackle the problem by heating silver oxide until the silver and oxygen separate, however there remains the problem of isolating...

Is there a chemical that can absorb oxygen and nitrogen and in solid form. I need to make a vacuum in a pvc pipe or close to a vacuum. I was wondering if there were some chemicals that I could insert into the pipe and then close the end and tip it over and mix the chemicals together that...

I just started reading a pamphlet written my an M.D. about a poorly understood illness. On the second page he writes: "Hypoxia is a technical term meaning the inability to transform oxygen into energy." On the next page he writes: "It is due to a problem at the cellular level converting...

my question actually is that 1)are there living organisms that do not require oxygen, 2)why is this oxygen is important couldn't life have developed without oxygen 3)can there be living beings not made up of organic compounds :D Thanks in advance for ur answers (i m sorry if this...

Is oxygen that comes out from a car and regular oxygen the same (exactly identical) except that one is warmer than the other?

H20 is polar in nature. It is fundamentally because oxygen is more electronegative than hydrogen and the shared electrons tend to be near oxygen. This may be because the atomic number of oxygen is more than that of hydrogen. But in the bond I don't understand how the 2 shared electrons...

From my rather weak understanding of nuclear fusion in stars, four hydrogen atoms are combined into one helium atom. Then, three helium atoms are combined into one carbon atom. What I don't understand is why there is more oxygen in the universe (from the wikipedia article) than carbon, if carbon...

Let's say I have a balloon full of Hydrogen that is STP, and outside this balloon I have normal air (containing oxygen) which is also STP. Is there a way to produce energy by turning these 2 items into a fuel cell, if so how practical is it (in a DIY setting) and is there anything that would...

I would like to use a ventura type of setup to induce/atomize oxygen into water. I have a pond that gets clearer as I spread out the same amount of water falling into the pond. The more I spread the falling water out causing multiple areas that crash down on the rock or the surface water...

Can we measure COD in Mol/Litres?

I have an oxygen probe that produces a millivolt reading once it reaches 1500F based on the parts per million of oxygen in a heat treating furnace. The life remaining in the probe can be estimated by the resistance it inherently has at this temperature. A new probe has about 10-15K Ohms and...

Homework Statement Air at sealevel is composed of 80% nitrogen and 20% oxygen, but at the top of Mount Everest the composition of air is different. Give an expression for the ratio (f_O) of oxygen in the air as a function of height z above sealevel, assuming the temperature T is constant and...

Yeast are eukaryotic microorganisms that can produce ATP through either fermentation (anaerobic respiration) or cellular respiration (aerobic respiration), depending on whether oxygen is present, similar to animal cells. If oxygen is present, yeast cells consume glucose much more slowly than if...

Does anyone have explanation, or can point me to papers explaining this thread title? Personally, I did some reading through years, but I could never find an answer to this question. In short, here is what I learned so far: Oxygen: - in free form, is a product of photosynthesis of...

Is the amount of oxygen in the air always the same?if yes,how?or if not, how not?

Since space is a vacuum. And humans breathe out oxygen which will transform into carbon dioxide, would it transform(not really transform, you all know what my reference is)(what does it really do when it leaves our body?)into carbon dioxide and after it is sucked into spaces' vacuum, where does...

I was just wondering that if ozone is a strong[er] oxidizing agent [that oxygen alone] and its boiling point is higher than liquid oxygen [more practical?], then can it be used for applications where liquid oxygen is usually used?

Hi, Does wave hit the shore produce oxygen? If so, how and how significant is this amount of oxygen? Thanks!

i have done the maths based on an online conversion calculator that said 1 liter of air is equal to 0.001m^3 in volume. my chemistry teacher tells me that my maths is wrong but won't tell me how... here is what i wrote: Failing the above, a larger crucible would hold more oxygen and the...

Homework Statement Powdered zinc is heated with sulfur to form zinc sulfide... however, part of the reactants react with O2 as well and form zinc oxide and sulfur dioxide... Imagine that 85.2 g of Zn reacted with 52.4 g of S8 and 105.4 g of ZnS was formed... If the remainder of the...

Today in class my chem teacher was insistent that 2Mg + O2 = 2MgO was a synthesis reaction. this I agree with. however, he was also adamant that this was not a combustion reaction, when it our textbook it specifically gave us this very same example as a type of combustion reaction. Question: is...

Homework Statement Write down the electonic configuration for the O atom. Write down the quantum numbers (n,l,m_l,m_s) for each one of the electrons. Homework Equations Pauli exclusion principle. Least energy principle for filling the shells. The Attempt at a Solution...

Hi there, I am trying to get the Eh (or pe) of water samples which I took last summer. I didn't measure it directly at the time. I do have dissolved oxygen values from each site. Is there a way to convert dO2 into Eh? All the dO2 values were in the 80-100% range. Alternatively, is...

The Question: - "Oxygen forms three separate ions. What are the names and formulae of the three ions?" Now I am familiar with the ion "Oxide" which is the Oxygen atom with a 2- (negative two) charge, but I cannot find any information on these other two, any help would be greatly appreciated...

I am very confused - any electrons added to dioxygen must inhabit an anti-bonding molecular orbital which leads to destabilisation of the molecule. So why is dioxygen such a powerful oxidising agent? I need to understand this to try and figure out why nitrogen monoxide is readily oxidised by...

Nitrogen is a lewis base because it has a lone pair of electrons with which to form bonds with electrophiles. Oxygen has 2 lone pairs of electrons and halogens have 3. Why doesn't oxygen use any of its spare pairs of electrons to react with electrophiles?

Homework Statement Calculate the number of moles of oxygen gas produced from the completely catalyzed decomposition of 6.60ml sample of a 3.5% solution of H2O2. The density of the 3.5% solution of H2O2 is 1.01 g/ml. Homework Equations 2(H2O2) --> 2(H2O) + O2 p=m/v The Attempt...

Is there anyway to find out or approximate how much carbon dioxide a person produces per day, how much oxygen does a plant produce per day. And do different species of plants produce different amounts of oxygen?

hello i going to make an moto bike of 50cc engine to work witn hydrogen... and my problem is : how many liters of hydrogen i vgot to pun in 1 litre of oxygen.. what carbirator i vgo to make.. or were i can take one li it for example the combution rating of fuel/oxygen is 14.7/1 i've...

Homework Statement http://scc.scdsb.edu.on.ca/Students/onlinecourses/Sikora/sch4u/v12/64.pdf That is the lab I have been working on. I've done the lab but I am answering the questions. I don't understand the Analysis question #1. How do I calculate the reaction rate for oxygen if I don't have...

Sorry to butt in on your form. Please can someone help me with this – I’m sure it’s simple to those who know but I have been thinking about these 2 problems for ages (and reading up on every website I can find) and still no answer. I am trying to get a basic understanding of this and seem to...