Hydrogen Definition and 1000 Threads

Our Sun is at least a second generation star. This is known from the heavy metal content of the star. But if a previous star (or stars) existed in the vicinity of our Sun and used up all their hydrogen fuel, where does the hydrogen come from that makes up most of our Sun?

Homework Statement Given the following recursion formula: b_{j} = 2 \frac{kj - a}{j(j+1)-l(l+1)} \cdot b_{j-1} (where a, k and l are constants) how can b_{j = l} \neq 0 if b_{j - 1} = 0. Homework Equations The Attempt at a Solution This is a part question and I really can't see why. if...

Homework Statement "Plan how to make 100mL of a buffer solution with a pH of 10.8 to be made using only sodium carbonate, sodium hydrogen carbonate and water" Homework Equations pH= pKa+ log(CO32-)/(HCO3-) The Attempt at a Solution I tried rearranging it, but I'm not sure what to do...

Hi, my brother had a insight of making hydrogen fuel cells and begin a business with it. Would that even work ? I am having my doubts.

Homework Statement is significant hydorgen bonding possible in phosphine, PH3 The Attempt at a Solution The text says no, I don't see why not. P has 5 electrons in its outer shells, 3 of those form an ionic bond with the 3 H. That leaves 2 non-binding electrons, those 2 non-binding...

Would like to see if I've understood this question somewhat. :-) Homework Statement A doubly ionised Lithium atom (Li^++) has two of its normal complement of electrons removed. The energy levels of the remaining single electron ion are closely related to those of the neutral Hydrogen...

Homework Statement For potassium in ground state configuration (Z=19) how would you expect the energy of the least tightly bound electron to compare with the energy of the electron in hydrogen excited to a state of the same principal quantum number n. Explain your answer. Homework...

According to the reactivity series, copper is below hydrogen. In theory, hydrogen gas should be able to displace copper in a copper(II) chloride solution should the gas be bubbled into the solution, is this true?

Hi all How does one calculate the recoil velocity of a hydrogen atom when the electron in it jumps from a higher orbit to a lower orbit (say from 3rd to 1st) ?

Homework Statement The H-alpha line corresponds to a transition between the 2nd and 1st excited states of hydrogen, and has a wavelength of 656.3nm. The ratio of the number of atoms in these two states in an interstellar cloud of atomic hydrogen is 2x10^-6. Find the temperature of the...

Hi, I'm just after a definitive answer on how Hydrogen fuses into Helium in the Sun? Some places say the Sun is so hot that they overcome their same charge repulsivness and fuse together while other places say that our sun is not hot enough for that to happen and that they just get close...

I'm wondering if it is possible to make metallic hydrogen. Metallic hydrogen would be a good thing to have because hydrogen is an excellent fuel source, and since it is; under STP, a gas, having it be in a metallic form would be a great way to carry lots of hydrogen, only with less volume in...

Hi, I'm doing a spectroscopy assignment and am analysing the NMR for p-Toluic acid. However, I need to understand the NMRs of it's isomer o-Toluic acid as well. http://en.wikipedia.org/wiki/O-toluic_acid On first inspection, I thought there was 4 Hydrogen environments present in this...

Homework Statement Combine the Darwin correction with the relativistic kinetic energy correction for l=0 to show that the fine structure formula: \DeltaE_{fs}= - \frac{(E^{(0)2}_{n})}{2mc^{2}}[\frac{4n}{j + 1/2}-3] remains valid for l=0 Homework Equations From a previous problem...

I am terribly confused. I have always been hearing that in the hydrogen atom, 2s and 2p orbitals have the same energy. Similarly, the 3s, 3p and 3d orbitals have the same energies. This is also suggested by the hydrogen spectrum, my professor also believes the same, and I am unable to find...

Homework Statement The rms speed of the molecules in 1.1 g of hydrogen gas is 1800 m/s. 500 J of work are done to compress the gas while, in the same process, 2000 J of heat energy are transferred from the gas to the environment. Afterward, what is the rms speed of the molecules...

Homework Statement I'm trying to verify equations 16 and 17 on the attached paper, but I'm just not getting the same values they are. I've used mathematica and it just isn't happening. For one thing, there should be a factor of 1/2 in front of equation 16, but I'm really not seeing how they...

Homework Statement Which of the following substances exhibits significant hydrogen bonding in the liquid state? A) CH_{2}F_{2} B) N_{2}H_{4} C) CH_{3}OCH_{3} D) C_{2}H_{4} E) C_{2}H_{2} Homework Equations The Attempt at a Solution I know that hydrogen bonding generally only works...

When a completely ionized atom of hydrogen captures an electron, the latter may conceivably cascade toward the nucleus by jumping successively from one permitted orbit to the next. If we could watch the light emitted by this single atom, to what lines of the complete hydrogen spectrum will the...

Assume the universe consists of a single photon, a single atom of hydrogen and a spherical detector (like an encompassing shell) with a semi-infinite radius. The photon gets "absorbed" by the hydrogen atom. Moments after the photon is emitted. My question is the following: from the time...

so the title speaks for itself i hope. my problem is i don't know how to work the formula. what are the ns about?? lamba^-1 = R(n1^-2 - n2^-2)

I'm trying to understand my textbook's answer to the following problem: Q: Electrolysis can under certain circumstances result in the production of hydrogen peroxide. At which electrode will this occur, cathode or anode? A: During the formation of hydrogen peroxide from water, oxygen is...

I am trying to prove to myself that the most probable distance for a 1s electron in a H atom is the Bohr radius. The probability of finding an electron (for any given state in a hydrogenic atom) in a spherical shell of thickness dr at a distance r from the nucleus is \left|R_{nl}\right|^{2}...

Ok everyone, ever since i was 16 i have been studying this kind of stuff. Anyways I'm now 18 and a senior in high school and really want to get one of my theories out there. I am not giving my complete theory but i want you guys to give me straight answers on this. We all know we were basically...

I'm just doing some reading on stars and I've hit a problem which I can't solve. According to a book I'm using it claims the amount of hydrogen converted in the Sun over it's lifetime so far is 5.4x10^55. I roughly agree with this figure using the method this author calculates the number. He...

I almost have the answer, I'm sure there's just a minor flaw in my reasoning. Here it goes: We're given that the angular momentum of the atom is integer multiples of h-bar (n\hbar) (integer depending on the orbit). Now the centripetal force is given by F = \frac{mv^2}{r} = \frac{p^2}{mr} =...

I am new to nuclear engg., i want to know the phenomenon of elastic scattering of neutrons. Resources available in the net suggest that in materials containing atoms of low atomic mass(hydrogen), neutrons of all energies can lose a significant fraction of their energy in a single elastic...

In thermodynamical equilibrium what would be the proportion of hydrogen to helium-4? According to the proton-proton chain branch I it would seem that the equilibrium would be 75% H-25% He-4? is this correct? (This is of course an unrealistic scenario).

Homework Statement in part 1 i used the Saha equation to calculate that the hydrogen in the center of the sun was fully ionized (given temperature and central electron density). part 2 says: Re-examine the result by computing the average separation of atoms at the center of the sun knowing...

If a a 1s hydrogen atom is placed in a B field, how many energy states will it split into?

Homework Statement A neutron moving with speed v makes head on collision with a hydrogen atom in ground state kept at rest. Find the minimum Kinetic energy of the neutron for which inelastic(completely of partially) collision may take. (mass of neutron=mass of hydrogen=~1.67*10-27)...

Homework Statement Suppose we succeed in building a H-->He fusion reactor. How much hydrogen would have to be converted per second to supply the world's electricity consumption of 10^13kwh. Homework Equations This is what I am looking for, I think i can figure it out once I know the...

Hey, I'm wondering how you figure out the number of hydrogen bonds acting between molecules. I know each water molecule supposedly makes 4 hydrogen bonds with other water molecules through my reading, but I want to know how many for isopropyl alcohol, which has only one OH group. I know its less...

I am looking for a brief summary of current hydrogen detection within galaxies. How are H I and H II detected? Is there a minimum required temperature and/or density ? How is molecular hydrogen detected? Is this the only form of hydrogen with sufficient density that can become opaque...

Hi everyone! So we're learning about the Hydrogen atom in QM and I'm having trouble reconciling something in my head. We're looking at potentials that are only radius dependent, like the Coulomb potential. Now, I know the math. I see that we assume the wave function can be separated into the...

Homework Statement A hydrogen atom at rest emits a photon with wavelength 410.1 nm. First, calculate the recoil of the hydrogen atom when emitting the photon. (recoil = momentum) Second, calculate the recoil of the hydrogen if we replace the electron mass with the reduced mass μ. Third...

Homework Statement In Bohr’s hydrogen atom, the frequency of radiation for transitions between adjacent orbits is νBohr = (En+1−En)/h. Classically, a charged particle moving in a circular orbit radiates at the frequency of the motion, νorbit = v/2πr. Find the ratio νBohr/νorbit for the...

The site http://physics.nist.gov/PhysRefData/Handbook/Tables/hydrogentable3.htm shows the intensity of various photon energy values from hydrogen. I was not able to see how this intensity was observed (ie. was it from a specific experiment, or does one simply look at the sun and count photons...

I know that a teller-ulam device uses lithium deuteride as its nuclear fuel. I know very little about chemistry, but why is a hydrogen bomb called a hydrogen bomb, if its nuclear fuel is lithium deuteride? Is it the hydrogen atom in the lithium deuteride that creates the fusion process?

When (what year and by whom?) was it discovered that the hydrogen potential is V=-1/r ? I imagine this was deduced from experimental data... amirite? Quite urgent... From wiki it looks like it was found in teh 1920's but I'm not certain so I just want to check. Thanks in advance

when proton and electron combine to form hydrogen atom(ground state) what is the source of radiation emitted

Homework Statement The average function of the H-atom in its ground state is ψ(\vec{r})=(1/(πa03)1/2exp(-r/a0) a0: Bohr radius a.What is the probability i. P(\vec{r})d3\vec{r} that the electron will be found in the volume d3\vec{r} around \vec{r}? ii. Pdr that the electron will be found...

Homework Statement I'm looking at two different time dependent perturbation solutions to transitions in hydrogen, and I'm wondering where the discrepancy comes from. Homework Equations See the attached documents- problem 2 in solutions5.pdf and exercise 2.10 in 2s decay.pdf. You'll...

Homework Statement Determine for the hydrogen atom states 1s and 2p the expectation value of the radius r and the associated mean square error Δr. Homework Equations Wave Functions for 1s and 2p from Demtroeder's Experimental Physics Volume 3 (it says "The normalized complete...

What is it exactly that causes the diatomic hydrogen to have such a greater volume than monatomic hydrogen?

When hydrogen chloride dissociates in water , does it form ions or atoms ?

I'm a little confused on hydrogen bonds. Here's a sample question and answer I'm having trouble with:1) In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by A) hydrogen bonds. B) nonpolar covalent bonds. C) polar covalent bonds. D) ionic bonds. E) van der Waals...

Hi All, I've googled everywhere trying to find out if the combustion/flammability of hydrogen is reduced at all for low pressure at high altitudes. There is data for hydrogen at high pressures, but I've been unable to find any data for low pressures. For example, if a hydrogen balloon stays...

Homework Statement The rms speed of nitrogen molecules in air at some temperature is 493 m/s. What is the rms speed of hydrogen molecules in air at the same temperature? Homework Equations Vrms The Attempt at a Solution

Homework Statement We know that: E=<\psi|H|\psi> where H=-\frac{\hbar^2}{2m} \nabla^2 - \frac{Ze^2}{4\pi\epsilon_0 r} and \psi=R(r)Y(\theta, \phi) with R(r)=\frac{1}{\sqrt{(2n)!}}(\frac{2Z}{na_0})^{3/2}\left(\frac{2Zr}{na_0}\right)^{n-1}e^{-Zr/na_0} If I want to find the energy, do...