All Questions
15
questions
2
votes
1
answer
96
views
Do solvated electrons short circuit the electrolysis of liquid ammonia
If attempting the electrolysis of liquid ammonia using NaNH2 as an electrolyte. It is understood that Na+ will form solvated electrons. I understand that these solvated electrons can dramatically ...
- 39
-5
votes
1
answer
1k
views
How does hydrogen and oxygen combine to make water? [closed]
When two hydrogen atoms fuse with one oxygen atom to create a molecule of water, each hydrogen atom donates its single electron to the oxygen atom, resulting in 10 electrons for the oxygen, instead of ...
-2
votes
1
answer
336
views
How to calculate ionization energy of an atom provided energy of the electron at ground state? [closed]
It is given that in ground state the energy of electron in hydrogen atom is $-2.18\times10^{-18}\mathrm{J}$. I'm required to calculate the Ionization Energy in kJ/mol
Question for reference:
At ...
- 1
5
votes
1
answer
146
views
How can a hydrogen atom ever emit an X-ray photon?
From Scientific American, February 2014:
The Proton Radius Puzzle:
...we had to tune the laser so that it came in with exactly the right amount of energy. The atom would make the jump to the higher ...
- 1,795
-2
votes
1
answer
104
views
Where do the electrons in lead–acid battery come from? [closed]
$$
\begin{align}
\ce{PbO2 + H2SO4 &-> PbSO4 + H2O + O} &\quad &\text{(anode)}\\
\ce{Pb + H2SO4 &-> PbSO4 + H2} &\quad &\text{(cathode)}
\end{align}
$$
The cathode’s $\ce{...
1
vote
0
answers
326
views
In a hydrogen fuel cell stack, is pure oxygen required?
I have been researching making a hydrogen fuel cell to produce electricity. However, since pure oxygen is expensive, is pure oxygen needed for the dry fuel cell stack or can the oxygen in the air be ...
- 11
1
vote
1
answer
2k
views
Difficulty understanding redox in terms of hydrogen and oxygen transfer?
I have come across 4 ways of defining oxidation:
loss of electrons
increase in oxidation number
gain of oxygen
loss of hydrogen
From these definitions, I have an idea of what I think 'oxidation' and ...
- 1,697
2
votes
1
answer
2k
views
Why is there an upper limit to the photon energy that can be observed in the discrete emission spectrum of the hydrogen atom?
I think it must have to do with the fact that an incident photon with a sufficiently high energy will ionize the hydrogen atom (i.e. the electron will be ejected). Therefore it won't show in the ...
- 260
0
votes
1
answer
1k
views
What is generally meant by distinct line spectrum?
In a single hydrogen atom the electron is excited to 6th orbit. The book says maximum 5 distinct spectral lines are possible when the electron comes to the ground state.
Looks like they have only ...
- 501
14
votes
1
answer
350
views
Photoionisation microscopy of hydrogen - where are the p orbitals?
In this Physics Review Letters article, which was published in 2013, but I found recently, the authors report photoionisation microscopy images of hydrogen atoms in various electronic states.
A. S....
- 43k
4
votes
2
answers
26k
views
How many bonds can Hydrogen make?
Recently I saw a video which told me that Hydrogen has a valency of 1, i.e, Hydrogen can only bond with 1 other atom. But since hydrogen wants a complete shell, it can have 2 covalent bonds with 2 ...
- 49
4
votes
1
answer
999
views
Reduce chlorine gas
I have a simple electrolysis setup which uses aqueous sodium chloride as electrolyte. The problem is that, the setup makes tons of chlorine gas along with hydrogen (I only want hydrogen). I didn't ...
- 563
4
votes
1
answer
427
views
Potential term in the hydrogen atom Hamiltonian
Here is how I saw the Hamiltonian being written in one Quantum Mechanics book:
$$\hat{H} = -\frac{\hbar^2}{2m_\mathrm{e}r^2} \left[\frac{\partial}{\partial r}\left(r^2\frac{\partial}{\partial r}\...
- 151
1
vote
1
answer
8k
views
How can the 18 electron rule be used to explain that Fe(η5-C5H5)2 doesn't react with hydrogen but Ni(η5-C5H5)2 does?
Fe(η5-C5H5)2 does not react with hydrogen, but its nickel analogue, Ni(η5-C5H5)2 is readily hydrogenated to give Ni(η5-C5H5)(η3-C5H7). Use the 18 electron rule to explain this behaviour.
My answer so ...
- 1,043
1
vote
1
answer
30k
views
How do I calculate the change in energy of an electron transition?
What are the $\Delta E$'s of the transitions of an electron from $n=5$ to $n=1$ and from $n=5$ to $n=2$ in a Bohr hydrogen atom? The wavelength of the first electron transition is $\lambda_1=409~\...
- 113