Nitrogen Definition and 209 Threads

My Chemistry Teacher told that 5 of the 6 oxidation numbers of Nitrogen are not true. He said something like it is a mathematical trick for I don't know what. The real oxidation number is -3. Can anyone explain me what are the 5 false oxidation number? Thank you.

This problem was translated from Swedish, sorry for any grammatical errors. The problem A cylinder with nitrogen gas inside is closed by a tight piston (that can slide without friction against the walls of the cylinder). The piston weighs ##s=12.5 kg## and holds the ##m=28## grams of nitrogen...

"Most vegetables, annuals and grasses prefer their nitrogen in the nitrate form and as such do better in alkaline inclined soils dominated by bacteria. Most trees, shrubs and perennials prefer their nitrogen in the ammonium form and as such do better in acid inclined soils dominated by fungi."

I am trying to find the theoretical power required to compress nitrogen from a pressure P1 to P2, as well as the final temperature T2 after compression. I found no formula that were anywhere near complete, but I found this tool, which tells me that from 300K@1Bar, I need 271.4kw (271kj/s) to...

Homework Statement Nitrogen at 100°C and 600 kPa expands in such a way it can be approximated by a polytropic process with n=1.2. Calculate the work and the heat transfer if the final pressure is 100 kPa. Homework EquationsThe Attempt at a Solution I used the equation T2/T1=(P2/P1)^[(n-1)/n]...

No idea why this popped into my head on the drive home tonight, but here we go: Would it be possible to build a rocket filled with either liquid Nitrogen, or some other super-cooled substance, then use a battery of high-energy, ground-based laser beams pointed at the super-cooled propellant to...

Hi Everyone liquid nitrogen is very useful . i want to know how to make liquid nitrogen? i won't make a one. but i only want to know how to make it .

Homework Statement *All units given are in standard SI units unless otherwise specified.* *Assume a closed system* How much of -200ºC Liquid Nitrogen is required to completely freeze 200mL (0.2kg) of pure liquid water at 0.00ºC (No change in heat, only a change in state)? Given Values. n=...

Homework Statement A high school experiment shows a plant immersed in a solution of nitrate ions. The beaker is closed but has an air vent passing into the solution. Q. Why is air bubbled into the solution Q. Why is the beaker covered with black paper Homework EquationsThe Attempt at a...

Homework Statement According to statistical mechanics, the average kinetic energy of a particle at temperature T is 3kT/2, where k is the Boltzmann constant. What is the average de Broglie wavelength of nitrogen molecules at room temperature? Homework Equations KE = 3kt/2 = p2/2m λ = h / p...

What combination of these might produce a brown solid? For talking's sake...

Currently i have a system using bulk argon and i am changing to nitrogen. To trial this i am going to use cylinders of OFN(oxygen free nitrogen). how do i caculate how many cylinders i need based on a flow rate of 16 liters/min. Thanks

Hi All Expert... I have a question need help. I have a part with internal volumme 24.5mm^3 at environment pressure 1.01325bar. When I feed it with 1.14bar (nitrogen)...with a inlet Dia. 0.05mm How can I calculate the pressurization time for the internally volumme up to 1.12bar assume the...

For group 15 elements the order of basicity given is NH3 > PH3 > AsH3 > SbH3 > BiH3 And order of reducing strength is BiH3 > sbH3 > AsH3 > PH3 > NH3 Why are they in opposite order? Reducing nature means tendency to donate electrons. Basicity means strength of bases and hence as basicity...

There has to be a way around the nitrogen fixation issue with humans - it can't be the case, as so thoroughly stated everywhere, where we have to consume nitrogen in foods (amino acids?) in order to satisfy our nitrogen needs. Is there any outside the box thinking, any super sleuths with a...

Homework Statement Hi guys, any help here would be greatly appreciated. I'm told that a carbon-12 atom fuses with a hydrogen nucleus with the atomic mass of 1 to form a nucleus of nitrogen releasing 1.95 MeV as a result. I'm asked to write an equation of the reaction and work out the...

Homework Statement A rigid cylinder contains 9.0g of nitrogen at 20 ∘C. What is the minimum amount of heat energy that must be removed to liquify the nitrogen? Homework Equations Heat Energy H = Cp * m * ΔT H = Heat Energy Cp = Heat Capacity m = mass (in Kg) ΔT = change in...

When doing an experiment to find the specific latent heat of fusion of liquid nitrogen, you find that 100 kJ of heat must be removed to freeze 3.8kg of nitrogen at its freezing point. What value will you get for the specific latent heat of fusion of nitrogen? Power=100kj M=3.8kg I don't...

Ok so I need to get a 3foot stump out of concrete without damaging the concrete. It's at that terrible stage where it's to rotten to pull out and to solid to scoop out. My idea is to drill a hole and pour liquid nitrogen down the hole to make the wood brittle and then smash it with a pry bar...

Hi. I'm looking for a common electronic component that can be used to determine a temperature between room temperature and that of liquid nitrogen. -Multimetre probe failed, getting stuck at -135*C -Common NTC thermistors rapidly ascent past gigaohm range, even from 1Ω-5Ω initial values...

I was wondering if I could create plasma inside my own apparatus using a laser pointer and nitrogen..

I thought some of you engineers would be interested in reading my web tutorials. I have written some extensive tutorials on the theory and building of a homemade N2 gas generator. It takes regular air, and using pressure swing adsorption, concentrates the N2 up to 99%. This is here. I then...

a 9 L vessel contains 3 moles of helium and 3 moles of nitrogen at a pressure of 10 atm. Maintaining constant temperature, an additional 2 moles of helium are added. Assuming gases behave ideally, what are the partial pressures of nitrogen and helium at the end? Initially there's: 3mol He/(3mol...

Hi, While experimenting with various LED's in LN2, I noticed some strange behaviour from my green LED's. As expected all LED's (except the green one's) emitted light with a shorter wavelenth (for instance, my yellow led turned to red etc). However, my 2 (different manufacturer type LED)...

Sorry for the template not being present, when I use my phone it doesn't show up. I am trying the problem about liquefying liquid nitrogen, and I am having my first problem finding the latent heat of vaporization at 280.6 K. I try using trouton's rule, and I get a domain error because the inside...

I am trying to build a system to transfer liquid nitrogen (LN) into a roughly 6'x4'x2' sealed nitrogen gas-purged enclosure. The LN is in a pitcher-style dewar like this http://static.coleparmer.com/large_images/03773_51.jpg but with an open top, and the container I'd like to transfer it into...

Hello, I am currently designing a pressure vessel and am interested in compressing it with nitrogen up to approximately 10 MPa. How would I go about determining the associated temperature rise when this takes place? This will have implications on the strength of the metal used. Thank you...

i) Commercially, nitrogen is sold as compressed gas in cylinders. If a cylinder of volume 116 L is filled with N2 to a pressure of 1.38 x 104 kPa at 298.15K, what mass of N2 does the cylinder contain? Assume ideal gas behaviour. Answer: Mass N2 = 18104 g = 18.1 kg ii) Now, regarding part i), if...

A while ago I had asked if anyone ever made liquid nitrogen from scratch without using a prepackaged cooling device (cryocooler). Well, I've done it. I'm working on a web tutorial and better video footage. For those who wish to make suggestions on what you would like to see I am submitting...

I missed the first week of college so I've fallen a bit behind. The main class I'm struggling with is mass spec since its relatively new to me. Whats really boggling my mind is this "nitrogen rule". Heres a quote from another site: I'm trying to get my head around this. So nitrogen has a...

Homework Statement The relative compositions of the pollutants NO and NO2 in air are governed by the reaction NO + 1/2 O2 ⇔NO2 For air containing 21-mol% O2 at 25C and 1.0133 bar, what is the concentration of NO in parts per million if the total concentration of both nitrogen...

What are the reasons (advantages) for using nitrogen when venting vacuum systems?

nitrogen gas is said to prevent cavitation in shock absorbers and thus provide a comfortable ride.. i want to know what actually happens in a shock absorber when nitogen gas is used. how does it prevent cavitation?

Homework Statement Work out the mass flow rate of Nitrogen traveling through a at 0.3m^3/s if the pressure is 1 bar and the temperature is 18°C and the ideal gas constant is 8314 J/Kg K Homework Equations m=ρ*V*A m = mass flow rate ρ= density V = velocity A = flow area PV =...

How would you find out the volume 8kg of nitrogen gas would be? Please help

Ok so I wish to try solve a problem at work I will try explain as best I can . Problem Definition; Filling of a bundle of cylinders 17 x 50litre ( 850 000 k/m^3). 30 % Co2 in the cyindrical vessal followed by input of Nitrogen 70% to a final pressure of 200 bar Due to production...

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 Two closed systems of the same size, temperature, and pressure. One is filled with pure nitrogen the other an atmospheric mix (nitrogen/oxygen/etc...throw in some moisture). I want to evacuate both systems to 500 microns using equally sized vacuum pumps. Why will the...

hi all. I'm trying to write an article about a molecular perspective on (aircraft) lift. I am guessing nitrogen does most of the lift since it's the most abundent in air. how does a nitrogen molecule stick to a steel molecule (plane's)? is there a short term electronic bond between the two...

Hey guys, I don't post here often but I like to come here when I have a problem that really rattles my brain. I am an 'overclocker' by hobby (I tune computers), a big part of the overclocking scene is cooling the processor of the computer as far as possible. For years now the 'best' way of...

Hi, I've been working on an experiment where I dip LEDs into liquid nitrogen and note the color change. All online sources I've seen predict that the wavelength of the light emitted by the LED will decrease upon immersion. What I've been observing, however, is a sudden decrease in...

I have two questions for you guys A) what is the electrical resistance per meter of Liquid Nitrogen and B) What is the heat specific heat capacity of Liquid N.

An 18-year-old teenager has had to have her stomach removed in an emergency operation after drinking a cocktail containing liquid nitrogen. http://www.bbc.co.uk/news/uk-19878511 Question? How does she eat food without a stomach? Carry a bag?

Maybe someone here will have an idea where I can get some information. I am planning on making liquid nitrogen from air and will need to regenerate waste gas. This gas will be very cold (-300F) and will get transported through some tubing system. Is anyone aware of any plastic tubing material...

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?

Does anyone have a good source of saturation data for nitrogen at low pressures? By low pressures, I mean something along the lines of 0.01 atm. Thanks,

Has anyone done this as a DIY project? I want to use a refrigerator compressor with counter-current coils.

What is the escape velocity of nitrogen heated to 325 K?

Hi All, I tried to find entropy of liquid nitrogen in various data books, using nitrogen's CAS number, MSDS, but I was able to get the entropy of nitrogen till only 100K, not below that. Does anyone know what's the entropy of liquid nitrogen or that where can I find it? Thanks!

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...