Hydrogen Definition and 1000 Threads

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

Homework Statement What is the energy of H atom in the first excited state if the potential energy in the ground state is taken to be 0 ? Homework Equations Usually the energy of H atom in the ground state is -13.6eV and in the 1st excited state is -10.2eV E(n) = πme2/8ε2h2 Bohr's...

Hello Physicsforums, I'm curious to know what stability hydrogen receives through adding one more electron to its 1s sublevel level. The whole sublevel is at the same energy state, so why must it fill that one more space to attain stability? What does a full 1s orbital do to make it...

Griffiths writes that the formula for the hydrogen energy levels taking fine structure into account "breaks the degeneracy in l" but "still preserves degeneracy in j." I'm confused by this, because the formula he gives (Eq. 6.67 in the textbook) depends on j. How can the system be degenerate...

Water is covalent compound. But formation of water is written as: H+ + OH- = H2O I cannot understand why hydrogen is electrically positive in the above equation. Hydrogen wants one more electron to complete its first and last shell (total two valence electrons). Hence, hydrogen should...

What is the energy of an electron in the 2s orbital of a hydrogen atom? I thought En = -RZ^2 / n^2 Why am i not getting the right answer with Z = 1 n = 2 and R just the value of the constant

Homework Statement A Hydrogen atom is in a state with n=2? Homework Equations r=an^2 a=.0529 nm The Attempt at a Solution I am confused by my book it says that the radius of a stationary state is r=.0529*2^2=.2116 but I disagree isn't the stationary state n=1 which would mean the...

Homework Statement A hydrogen atom in an excited state absorbs a photon of wavelength 434 nm. What were the initial and final states of the hydrogen atom? Homework Equations 1/λ=1/91.127 * (1/nf2-1/ni2) The Attempt at a Solution Tried to use the equation, but keeping the initial...

I am studying for my exam and I have run into this problem. The problem is given here http://faculty.mint.ua.edu/~pleclair/PH253/Homework/Spring_2010/HW6-7_atoms_12Mar10/HW6-7_atoms_12Mar10_SOLN.pdf"],[/PLAIN] it is #9. I don't understand why -e ≠ ∫ρdV from 0 to the bohr radius, a0. If all...

I hope this is posted in the correct forum; From what I remember in school, Hydrogen (atomic weight 1) consists of 1 proton and 1 electron with 0 neutrons. Protium is an isotope of Hydrogen, which I assume makes it slightly different than H as is listed on a periodic chart, yet from what I...

My question is: Why the energy levels for sodium are different from those for hydrogen even though sodium is described as a "hydrogen-like atom"? Here I have posted the energy diagrams for sodium, and hydrogen. So, I have noted that sodium has 11 protons, whereas the hydrogen has only 1...

Hi, I'm not sure what I just created. First I mixed sodium iodide with hydrochloric acid. Then to that I added a hydrogen peroxide/ sulfuric acid mixture (thinking it was just hydrogen peroxide). It seems a black precipitate is forming. I was trying to make potassium iodide using an...

Homework Statement I have attached a solution to one of my homework questions that states "Draw hydrogen bonds that might be formed between a water molecule and the following compounds: a) H3PO4; b) PO43-; c) aniline; d) pyridine; e) ethylamine; f) ethyl ammonium ion; g) acetic acid." My...

Homework Statement A sample of hydrogen is at a pressure of 1000mb and a temperature of +10° C. Calculate its specific volume.Homework Equations I'm guessing PV=mRT The Attempt at a Solution P=1 bar m=2 g R=constant (do I use the universal constant or is there a constant for Hydrogen? If so...

"Given a simple and violent chemical reaction { H + H → H2 + 5eV }. however when hydrogen atoms collide in free space they simply bounce apart. the reason is that it is impossible to satisfy the laws of conservation of momentum and conservation of energy in a simple 2 body collision which...

Homework Statement

I was wondering if someone could explain how the laws of thermodynamics apply to these so called hydrogen on demand systems and or how these laws govern the operations of these systems. Physics is my next college course but, I am not asking this for any assignments I have, just a personal interest.

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...

A sole hydrogen atom in a vacuum (negligible gravity). The hydrogen atom has the lowest possible kinetic energy allowed by QM. Given that casimir effects apply... Will the hydrogen atom remain at it's initial lowest kinetic energy state indefinitely or is it possible for it's energy state to...

Imagine that we have got some vessel under standard temperature and pressure filled with atomic Hydrogen inside and the electrons of these atoms have got the same spin and therefore they cannot join into Hydrogen molecules, so the process of recombination does not occur. Then we begin cooling...

Does chlorine make a hydrogen bond? I was doing a practice problem in my book and the question was regarding the intermolecular forces, and the compound had chlorine and it said no, but my professor said it does. Which is true?

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...

Homework Statement A proton, which is the nucleus of a hydrogen atom, can be modeled as a sphere with a diameter of 2.4 fm and a mass of 1.67e-27 kg. Determine the density of the proton. Homework Equations As far as I know, the only required formula is D = m/vThe Attempt at a Solution Well...

Hello, I was wondering if it could be said that any proton can be identified as a hydrogen cation, and any hydrogen cation as a proton. Thanks.

Calculating the internal energy of gasoline is fairly simple, because it wouldn't vary much with temperature or pressure. For hydrogen, though, it would vary significantly with each. What sort of ranges would we be looking at? I'm curious if it would be possible to get the same amount of...

Hi,Everyone! I have a question! We often say hydrogen atom spectrum. But in nature ,it exists in the form of molecular hydrogen. today, I read something about hydrogen atom spectrum experiment. In the experiment ,we use hydrogen lamp. The Hydrogen lamp is a long glass tube filled with Hydrogen...

Hydrogen gas is supposed to be colorless, but what causes the murky grey-white color of the hydrogen gas produced in this reaction? http://www.youtube.com/watch?v=oQz5YEsx7Fo&feature=related skip to 00:30

If a hydrogen spectrum tube is filled with H2 gas and powered on, why do online sources show the tube emitting the spectrum of atomic single H hydrogen (the spectrum defined by the Rydberg formula)? Why not the H2 spectrum? For example, here: http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

HI,everyone.I have a problem. the angular portion of wavefunction of hydrogen,like 3d. n=3,l=2,so m=2,1,0,-1,-2.I read some books that say dxy,dxz,dyz,dz2,dx2-y2,so what the corresponding Relation between them. for example,dz2 corresponding what ?m=0?? and why? any help will be highly appreciated!

is it pauli or schrodinger? is there any original reference?

How to calculate the energy of the bonding state and antibonding state of a hydrogen molecule? and also how to plot the bonding and antibonding wavefunctions. I have solved Ψ(r,θ,Φ) for a hydrogen atom. and calculated the energy states of it with complete analytical approach. now, i need to...

I am doing my research on quantum transport. Now, I have some confusions- my questions and my idea about those go like this- 1. what is the ground energy state of hydrogen molecule? >> as long as i know, hydrogen molecule has a bonding state and an antibonding state. i think bonding state has...

All I need to evaluate the normalization coefficient. I need a step by step guide. It will be a great help if someone please tell me where can i get the solution (with intermediate steps). I think the solution can be done using the orthogonal properties of associated Laguerre polynomial. I need...

"Prove that the Bohr hydrogen atom approaches classical conditions when [. . .]" Homework Statement The problem and its solution are attached as ProblemSolution.jpg. Homework Equations E_k = chR/(n_k)^2 E_l = chR/(n_l)^2 ΔE = hc/λ hc/λ = chR[1/(n_k)^2 – 1/(n_l)^2] 1/ λ = R[1/(n_k)^2 –...

What exactly is it that makes the energy/mass of a hydrogen atom be lower than that of the electron and proton separately? I am aware that this process is what causes stars to emit light, during nuclear fusion deuterium has a smaller mass than a proton and a neutron so its extra mass/energy is...

hello folks, i was wondering if any other possible process of separating hydrogen from water without or less risk, any alternative method of electrolysis. i have googled this thing and stuck to process of introducing a catalyst 'titania(titanium oxide)' in the presence of sunlight...

We know this tiny splitting in degenerate levels in Hydrogen spectrum due to magnetic interactions between spins of electron and proton. but is that true the proton spin is independent of energy in this (hyperfine) splitting? I want to understand the physics of this splitting and how the spin...

why is hydrogen the only element in the periodic table that lacks a neutron?

I'm looking for the BEST and most COMPLETE book describing - The quantum mechanics of the hydrogen atom (working out completely the Schrödinger wave equation) - The quantum mechanics of many-electron systems (with a thorough explanation of the independent particle model, central-field...

With our stars consuming hydrogen to make helium, how much has been consumed since the Big Bang? I know 73 or so percent of the total mass of the visible universe is hydrogen, so how much has been consumed? IE, what was the original proportion of hydrogen to helium to other elements? I know we...

Why don't they tend to stay as they are?

Hello, First of all, i know I should use the template for this, and I apologize for that, but the thing is I don't even know how to begin to solve the next problem, and it's very important for me and for my tomorrow's afternoon exam. It's quite qualitative, and I'm sure most of you will know...

I'm doing a presentation on Hydrogen Fuel Cells for my class, but I'm having a hard time understanding how exactly it is that they work. I'm only able to find information on fuel cells and they tend to not be descriptive on the hydrogen part. If someone could please link some articles that...

The term (E-V) which stands for kinetic energy is used in Schrodinger equation.Kinetic energy of electron needs motion and fixed path which leads to the conclusion that electron is moving around the proton in orbits and is not spread out because derivation of Schrodinger equation is based on...

if delocalization of electron in hydrogen atom means that it is spread out upto infinity it means that infinite time is required for the electron to be localized when hydrogen atom is ionized.Is it so?

Homework Statement I have hydrogen in a 12 L tank, at T=15 C. Some of it is used, the T = const. and Δp=0.4 MPa, the molar mass of hydrogen is M=2*10^-3 J/(mol*K). Find the mass of the used hydrogen. Homework Equations Am I wrong in simply using: \Delta m=\frac{M}{RT}V\Delta p ...

Why does the Van der Waals forces of hydrogen weakest in liquid state?

Homework Statement Find the constant A such that the equation \psi(r,\theta,\varphi)=\sqrt{6\pi}A\sqrt{r}e^{-r/a} Wich describes one electron in a hydrogenatom, is normalized The Attempt at a Solution I figured this equation is seperable in the form...

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...

Hello, I am designing a small hydrogen peroxide rocket engine. Hydrogen peroxide will be pumped into a combustion chamber where there will be a catalyst (manganese dioxide in this case) that will convert the peroxide into steam and oxygen. These byproducts will then exit through a nozzle. I am...