Questions tagged [hydrogen]
Questions regarding the chemical properties of hydrogen and its behavior in reactions and compounds.
357
questions
13
votes
1
answer
13k
views
If electrolysis splits water, why does only either hydrogen or oxygen (but not both) bubble up on one pole?
If electrolysis splits water, then that means that $\ce{H2O}$ is split into $\ce{H}$ and $\ce{OH}$ or $\ce{O}$.
How come that if a water molecule is split at e.g. the negative pole (anode), only the ...
- 311
0
votes
2
answers
8k
views
How to find the molecular weight of a given gas based on its density?
The density of a gas $\ce{X}$ is $10$ times that of hydrogen. In that case, what is the molecular weight of gas $\ce{X}$?
Well what I've done up to now is this:
The molecular mass of hydrogen is $M(\...
- 349
5
votes
1
answer
3k
views
Delta G for Standard Hydrogen Electrode reaction
I’m dealing with electrochemistry problems.
For the following reaction
$$\ce{2H+ +2e- <=>H2}\quad E^\circ=0\ \mathrm{V}$$
Does it make sense to say
$$\Delta G^\circ=-nFE^\circ=0$$
Which would ...
- 51
3
votes
2
answers
878
views
Palladium hydride forming water and heat at room temperature
I just read that saturated palladium hydride, $\ce{PdH}$0.7, when exposed to oxygen will generate heat and water on it's surface, $\ce{4 H}$(Pd) $\ce{+O2}$(g) $\ce{\to 2 H2O}$(g, l).
What is going on?...
- 792
3
votes
1
answer
360
views
Hund's rule & different H₂ molecules
Does Hund's rule allow both of the following scenarios?
Filling each orbital with a single electron, so that a sub-shell, at first, only electrons with a negative spin
Filling each orbital with a ...
27
votes
1
answer
751
views
How does Palladium dissociate H₂ so easily?
If I understand correctly, $\ce{H2}$ in the presence of $\ce{Pd}$ readily dissociates as it dissolves into the metal. With the dissociation energy for the $\ce{H—H}$ bond being so large, how is this ...
- 792
8
votes
3
answers
94k
views
Why does the hydroxide ion have a negative charge?
I've been studying the roles of hydroxide & hydronium in acids and bases, and it was mentioned that a hydroxide ion (OH-) has a negative charge. Can someone give me a layman's explanation of what ...
- 191
8
votes
1
answer
179
views
Why would the loss of H₂ to space mean that the Earth's geochemistry would be based on acid/base reactions?
I am reading a paper[1] that contains the line:
Most of the $\ce{H2}$ in the Earth's mantle escaped to space early in the Earth's history; consequently, the overwhelming majority of the abiotic ...
- 233
8
votes
1
answer
4k
views
Samsung's S-Plasma Ion - scientific basis
Has anyone come across a scientific study of the S-Plasma Ions that Samsung claims will purify air from microbes, allergens and free radicals? I would prefer publicly available research findings.
The ...
- 181
15
votes
1
answer
787
views
Are there any examples of nuclear spin isomers having consequences for chemical reactivity?
Ortho- and parahydrogen are two forms of the $\ce{H2}$ molecule that are distinguished by their pairing or antipairing of nuclear spins, giving rise to metastable singlet (ortho-) and triplet (para-) ...
- 10.8k
15
votes
2
answers
2k
views
Why is slush hydrogen at the triple point?
Slush hydrogen is a mixture of liquid and solid hydrogen at the triple point considered as a possible vehicle fuel. What is the need of having it at the triple point? Couldn't any other set of ...
- 23.8k
35
votes
1
answer
12k
views
Why are there two Hydrogen atoms on some periodic tables?
Most periodic tables only feature one Hydrogen atom, on the top of the first group. But some, like the one I was given, also show Hydrogen in the 7th group, to left of Helium.
Why are there two ...
- 1,105