Oxygen Definition and 376 Threads

https://www.bbc.com/news/articles/c728ven2v9eo and the other main news websites. Does anyone have any idea what mechanisms could be involved?

When human babies are first born, they need to breathe immediately at birth. I don't think think that the umbilical cord carries air to the human fetus to provide oxygen. I don't think human fetuses can get oxygen from liquid (blood) like a fish does because human fetuses don't have gills. How...

Dear experts, how can I calculate the atomic density of Oxygen in a composite of 05 percent PuO2 and 95 percent UO2 (in atoms/barn-cm)? (5% U235 enriched)

I study genotype-environment associations in alpine species. I frequently see altitude as the sole predictor of partial pressure of oxygen in the literature concerning hypoxia adaptations. However, I understand that partial pressure of oxygen is also influenced by temperature, humidity, and...

For one of our projects we are at present using quite large amounts of gas & oxygen. What I was trying to figure out was how to calculate the total available amount of gas in a cylinder (be that either Propane/Oxygen or Propylene (Propene)) and then to determine whether or not -given a certain...

If I have 100mL inside a glass with a closed cap. I take the cap off, measure DO, put the cap back on and decrease the temperature 20 degrees. No agitation of any sort. Does the DO increase?

Ekaterina Magg, Maria Bergemann and colleagues have published results of new calculations concerning the composition of the sun. https://phys.org/news/2022-05-solar-spectrum-decade-long-controversy-sun.html As part of the work on her Ph.D. in that group, Ekaterina Magg set out to calculate in...

Hydrogen is a gas, sulfur is a solid, oxygen is a gas, why does combining them to produce sulfuric acid produce a liquid?

Hello. I am wondering; which solid at room temperature elements produce oxygen gas when put into a solution of sodium hydroxide? Thanks

I can't find anywhere direct videos of exploding oxygen tanks. Have you seen one? How does it explode? Does the tank disintegrates into smithereens like a sidewinder missile? Or does the cap blows off and the oxygen tanks becoming projectiles? And how do the exploding flames behave? The tank...

Covid is surging again due to the Delta Variant. I saw in the news of many oxygen tanks with people connected to them even outside in hospital tents. I'd like to know something. If a person accidentally given more oxygen than required, for example. 4 Liter/Minute instead of 2 Liter/Minute...

On April 20, 2021, an experiment on the NASA Perseverance Mars Rover broke down the CO2 Mars atmosphere to 2CO + O2. That makes it the first instrument to produce Oxygen on another world. Still a ways to go, design maximum is 10 grams per hour, people need around 60 grams per hour...

Hi, I was watching the following video. Around 17:00 the following is said: I tried to balance the chemical equation as presented in the video. Please have a look below. I don't see how the production of iron oxide yields more oxygen in the entire reaction. The heating of sodium chlorate...

"Randomized Controlled Trial Comparing the Effects of Far-Infrared Emitting Ceramic Fabric Shirts and Control Polyester Shirts on Transcutaneous PO2" K Washington et al 2018 Apr 10. doi: 10.4172/2165-8064.1000349 J Text Sci Eng. 2018; 8(2): 349. This study affirmed the fabric's effect -...

I'm struggling with calculating the flow rate for an oxygen system. There is a pressurised cylinder. This then joins onto a pressure reducer. Then travels down a length of pipe which branches off to 4 exits there is no restrictions on the exits it just goes to atmospheric pressure. I am yet to...

Summary:: Hypothetical discussion of a method to turn oxygen into fluorine through the use of another chemical and also discussing the biological effects of fluorine. Hello, I'd like to start this by saying my knowledge of chemistry is extremely basic. I barely graduated chemistry in high...

The pressure of oxygen at sea level = ##\frac{20.9}{100} ~\text{x} ~(21.2 ~\text{x} ~ 10^3) = 4430.8~ \text{Pa}## Then I do not know how to calculate the pressure at altitude 7000 m. I tried using P = ρgh (taking ρ as density of air = 1.3 kg/m3) then subtract the result from 4430.8 Pa but got...

My lecturer said it means: "3rd residue, C-terminal to Helix 'H'" but that makes no sense. If it's the 3rd residue then it can't be on the C-terminal, because the C-terminal is at the end of a massively long sequence of residues. Visa versa if it's on the C-terminal then it can't be the 3rd...

I am interested in whether or not Bose Einstein condensates have been realized for spin zero stable oxygen isotopes and if so, the maximum density achieved for these condensates. I understand that the quantum spins of oxygen 16 and oxygen 18 are both zero so such condensates would seem to be...

Homework Statement: I am having difficulty understanding what exactly is happening when radio transmissions are being absorbed by oxygen at 60GHz at the atomic level. Homework Equations: Refraction/reflection, oxygen absorptions/attenuation, frequency I have tried to find the answers online...

Today, the 2019 Nobel Prize in Physiology or Medicine was awarded to three scientists who study how cells sense and respond to changes in oxygen levels: https://www.nobelprize.org/prizes/medicine/ These three scientists were previously awarded the Lasker Prize for Basic Medical Research in...

Why is it that it is more stable for a negative charge to be spread over 2 oxygens than one oxygen and 3 carbon atoms? Following that logic, why is it more stable to spread a negative charge over 3 oxygen atoms than over 1 oxygen atom and one nitrogen atom? Is it because the difference in...

Hi, guys. Just found a missing thing in my brain: if atomic oxygen will meet free electron somewhere why doesn't it become fluorine or even argone?

I have recently started self studying chemistry and I am at the point where I'm learning to name chemicals given chemical formulas and vice versa. (Like Iron (III) Oxide --> Fe2O3). I am having trouble with doing this process for polyatomic ionic compounds. I can't seem to remember some the...

I don't understand this line in iter website. How is this reaction possible? "When exposed to the intense flux of neutrons from the fusion reaction, the oxygen present in the water generates short-lived radioactive isotopes of nitrogen—one (isotope 16) emitting a highly energetic gamma ray, the...

Homework Statement Why is enthalpy of combustion 0KJmol-1 for oxygen? I need to know this for my exam coming up soon. Homework Equations The enthalpy change when 1 mole of a substance is burnt in excess oxygen under standard states under standard conditions. The Attempt at a Solution Oxygen...

Hi everyone! I have some trouble figuring out the following question: If oxygen, nitrogen and ozone did not absorb UV radiation, what would you expect the temperature profile in the atmosphere to look like between the surface and top of the atmosphere? Specify the temperatures at Tropopause...

Hiya.. I know we need Oxygen to remove Electrons from the end of the ATP Cycle in Mitochondria but do we use Oxygen for anything else in the body ? Cheers

Hello Everyone, I've been trying to find an answer to this but am not getting anywhere. Any help would be greatly appreciated! I need to be able to calculate (or more likely estimate) the pressure drop I can expect when putting water under pressure if I know there is air in the system. For...

Homework Statement What's the difference between Oxygen Tension And Partial Pressure Homework Equations ...uh...rules of grammar ? The Attempt at a Solution If I knew the solution I wouldn't be here now would I ? Here are a few links https://en.m.wikipedia.org/wiki/Blood_gas_tension...

I am trying to figure out how you can subcool a dewar of liquid oxygen (vacuum insulated) just by releasing the pressure sitting on top of it. The liquid I am thinking of in this case is liquid oxygen, which boils at -297.33 F at 1 atm. Let's say I fill a dewar with LO2, then pressurize that...

Basically H is most abundant obviously... He is next, also obvious... Why is oxygen the next most abundant element? and by the way... I am a big boy I can handle answers of the sort: "Because that is just how it is..." but any more scientific insight is more than welcome! Thanks, Morlaf

Homework Statement A seeded BOD test is to be conducted on meat-processing wastewater with an estimated strength of 800 mg/L. The seed is supernatant from aged, settled, domestic wastewater with BOD of about 150 mg/L. Calculate the BOD value for the industrial wastewater if the initial DO in...

Hello everyone :) I have a question.Is it possible for life to exist in other planets without oxygen and water? I mean just because we need it to survive here on Earth.It doesn’t mean all planets need it to support life as well.

Is separating hydrogen and oxygen molecules possible? If so, how?

Does adding oxygen influence any physical properties of water which is oxygen deficient? Is it possible that adding oxygen leads to some temperature change and expansion?

Is water at the bottom of the ocean oxygen deficient? Compared to water at the higher levels.

This maybe a silly question but I do not know the answer. Did hydrogen combine with oxygen to form water in geological times or did they combine before that

Homework Statement Please look at the screenshot attached. The answer is "Yes", but I am not sure why. Homework Equations N/A The Attempt at a Solution Oxygen have six electrons, but the energy diagram shows only five. That was why I thought it was wrong, but the diagram shown is correct...

My question is that why is the negative charge on the oxygen atom with the single bond, why not on the oxygen atom with the double bond? I am confused. Source: https://chem-net.blogspot.in/2012/01/simple-procedure-for-writing-lewis.html

hi anyone and everyone! why do seeds need oxygen before they grow, in the time they are waiting for the right conditions to grow thanks

Homework Statement A beam of molecular oxygen containing 1010 molecules/cm3 and average speed of 500 m/s strikes (elastic collision) a plate at an angle of 30º with the normal direction. Calculate the exerted pressure on the plate. Homework Equations P = Impluse x Flux The Attempt at a...

'Morning all, I wish to use a 760nm laser to measure the concentration of molecular oxygen in a gas. I've a laser (multi-mode, not TDLAS:QLD-760-10S), a photodiode (Si), and I've built an oven to hold the laser diode at a constant temperature to avoid mode-hopping. Is it really as 'simple' as...

Hello, I am working with an artist to build enclosures that would hold magnetite sculptures in water filled test tubes... and they are rusting. One of the specifications I was given is it has to be chemical free water, so that rules out oxygen scavengers. Seeing as it is the dissolved oxygen I...

Lying 620 million light-years away, this galaxy has the lowest oxygen abundance ever seen in a star-forming galaxy. Link: New Scientist

Hello, This is for my independent game development project. I am aiming to simulate simple environmental properties in grid-based world. I have world made of cells (or blocks) and I consider each physical property to be constant and uniform in given cell. Some properties spread from a cell to...

Did the evolution of the eye include interaction/reaction with a specific frequency of light? Did the evolution of the lung include interaction/reaction with the air density, humidity, and temperature of its environment?

If anyone has used or uses an oxygen meter and could offer some advice it would be greatly appreciated. I degassed a solution of potassium iodide for 10 minutes each time and did experiments. However to get a more accurate measurement of the amount of O2 present I've decided to use an oxgen...

If a terrestrial, earth-like planet had an atmosphere similar to Earth but with only around 15% oxygen concentration and 84% nitrogen, what impact would that have on the greenhouse effect of the planet's atmosphere? Are there other factors that would be relevant to calculating the greenhouse effect?

Calculate the mass of 78 cm3 of oxygen at room temperature and pressure . Im trying to work out the number of moles and then multiply by 32.