Questions regarding the chemical properties of hydrogen and its behavior in reactions and compounds.

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0answers
8 views

hydrogen combustion volume expansion temperature change [closed]

there is an expandable container with 1.0 m3 of hydrogen gas and 0.5 m3 of oxygen gas. The gases are at STP. They are ignited. What is the final volume and temperature if there is no loos of heat and ...
-1
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0answers
19 views

Mechanically separate hydrogen and oxygen from water in electrolysis

I want to build a portable device that when separating water into hydrogen and oxygen in electrolysis captures the gasses without requiring the device to be level. The idea was to keep water in a ...
0
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1answer
18 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 ...
2
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1answer
31 views

Control the pressure of Hydrogen in a small container without the use of a pressure regulator

I had recently asked this question, and due to the comments and general consensus of safety concerns, I decided to re-ask the question, attacking the problem from another angle. The Problem I need ...
1
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0answers
26 views

Limit the production of hydrogen in a small container

I have to produce hydrogen at a near-constant pressure inside of a really small container without using an automatic pressure release value. I would like the pressure to be relatively high, but the ...
1
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1answer
33 views

Safely storing hydrogen

I have built a solar panel which is used to add electrodes to $\ce{H2O}$ and $\ce{NaCl}$, evolving $\ce{H2}$ and $\ce{O2}$. How can I safely store the hydrogen in the long-term?
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0answers
19 views

Electrocatalysis of Hydrogen Evolution Reaction with metal oxides

I'm new in this topic of electrocatalysis so I have some doubts. Also I´m not to clear with the themordynamic backgorund, so I will try to ask with the little thing that I know. I'm looking for a ...
1
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1answer
42 views

Standard Enthalpy of Formation of H2(g) vs H(g)

My question is somewhat related to this quesion. When I look at a table of standard values there are two entries for Hydrogen: $\ce {H2(g)} $ - 0 kJ/mol $\ce {H(g)} $ - 218 kJ/mol I understand ...
1
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1answer
33 views

Production of hydrogen through the reaction of aluminium metal and sodium hydroxide

If I have a solution of 25% $\ce{NaOH}$, and I simply add a cut-up aluminium can or some aluminium foil, will it react into hydrogen and sodium aluminate? In principle this reaction should happen, ...
0
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1answer
77 views

H2 Triplet State

How does $\ce{H2}$ triplet state exist if there are electrons in both bonding and antibonding ($1\sigma$ and $1\sigma^*$) orbitals? Or am I being taught the hypothetical triplet states of the ...
0
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0answers
33 views

Is it possible to efficiently convert hydrogen to methane?

According to this wikipedia page, hydrogen can combine with the carbon found in carbon steel to form some methane inside the steel, weakening it. Is is possible to convert hydrogen to methane by ...
1
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0answers
18 views

Combustibility of gas/carbon dioxide mix

Via electrolysis I produced an ethane/hydrogen/carbon dioxide mix. Normally, there is 1 part ethane, 1 part hydrogen and 2 parts carbon dioxide. If I simply used a Bunsen burner with air hole closed ...
1
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1answer
48 views

Hydrogen bonding in complex compounds?

Does the water molecules in coordinated water (where water acts as ligand) form hydrogen bonding with other complex molecules? Will the water molecules inside the complex form intramolecular hydrogen ...
12
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1answer
107 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. ...
6
votes
2answers
96 views

How much energy is stored when H+ is converted to H2?

I'm doing a write-up for this for my students: Source: Amirav Research Group (Facebook) The energy of formation of isopropyl alcohol is $-318.2~\mathrm{kJ/mol}$ (kilojoules per mole), that of ...
3
votes
1answer
67 views

Deuterium removal from water

What percentage of deuterium might be removed from water after a typical electrolysis procedure? From a post on this site I read that, "In the first stage, $\ce{NaOH}$ solution (initially $0.5\rm{M}$) ...
3
votes
2answers
51 views

What exactly happens when vegetable oil is partially hydrogenated?

My current assumption is that partial hydrogenation requires a polyunsaturated fat, because partial implies at least one but not all, which means there must be at least two double bonds in the fat, ...
1
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0answers
35 views

Is lithium hydride a salt?

Hydrogen is generally considered a non-metal, and a non-metal and a metal often makes a salt. However, lithium hydride seems like a special case. The wikipedia article does not clearly state if the ...
1
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0answers
19 views

Hydrodehalogenation of aryl chlorides

Palladium is the "go to" heterogeneous catalyst for dehalogenating aryl chlorides using hydrogen. What are the chemical (not economic) reasons for other precious metal catalysts not being as common or ...
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1answer
45 views

What is the relation between dielectric constant and hydrating tendency?

What is the relation between dielectric constant and hydrating tendency? Could someone also explain both terms?
0
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2answers
69 views

How difficult is it to produce diatomic hydrogen?

Just to preface this, I have a very basic understanding of chemistry, so forgive me if what I'm asking is super basic. How difficult is it to produce diatomic hydrogen? I've been doing some reading ...
0
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0answers
17 views

reduction of O2-partial pressure with a H2 fuel cell: minimal pO2? enhancements?

I'm preparing a biological experiment which requires a chamber to have $\ce{N_2}$, $\ce{CO_2}$, $\ce{H_2}$, and $\ce{O_2}$ at reduced partial pressure. I intent to start with ambient air, inject ...
0
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0answers
20 views

reducing agents as products

how could hydrogen gas be considered a reducing agent when it's a product where it helped in forming $\ce{FeCl2}$ instead of $\ce{FeCl3}$? $$\ce{Fe + 2HCl -> FeCl2 + H2}$$
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0answers
39 views

decomposition of h2o2

According to the decomposition of 3% hydrogen peroxide, if 2cm^3 of h2o2 is used, then 3 x 10^-5 mol of 02 should be produced. However, we needed to find the theoretical yield so we conducted an ...
0
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0answers
38 views

density of a hydrogen nuclei

I'm having trouble finding the density of the H nucleus, Since a Hydrogen nuclei has radius of 1.2e-10, and the nucleus is only composed of a single proton, thus the density would be (mass of a ...
0
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0answers
39 views

Why are hydrogenation reactions exothermic?

I learnt that all reactions that yield hydrogen are endothermic (such has reforming) and reactions, that use up hydrogen, are exothermic (FCC cracking, hydrogenation, etc.). But why is this so? I know ...
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1answer
29 views

Water splitting ways [closed]

Do you know the frequency you can split hydrogen from the water bonds? I have doing at now but i need to absorb more than 3 liters gas hydrogen per minute. My device working only with one ampere by ...
2
votes
2answers
325 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 ...
4
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2answers
146 views

Why doesn't hydrogen displace metals from their oxides?

As I understand it, a displacement reaction is where a more reactive element kicks out a less reactive element from a compound. For example, chlorine is more reactive than iodine, so chlorine will ...
3
votes
1answer
49 views

Can gaseous hydrogen and gaseous oxygen be compressed without reaction?

I'm looking into building a clean Bunsen-style burner (or rocket engine - I haven't decided yet). I will be using electrolysis to extract hydrogen and oxygen from water, but the apparatus I am ...
3
votes
2answers
277 views

Why this doesn't hydrogen peroxide decompose into hydrogen and oxygen?

I'm trying to understand why hydrogen peroxide doesn't decompose into $\ce{H2}$ and $\ce{O2}$, but instead into $\ce{H2O}$ and $\ce{O2}$.
5
votes
1answer
523 views

Does the hydrogen ion actually exist?

A chemistry test I did was an IGCSE test. One of the questions was Is Hydrogen Chloride ionic or covalent? Now, on a sheet I have been given, it states the hydrogen ion is $\ce{H+}$. So, it ...
5
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1answer
88 views

Hydrogen's confusing purple glow

While reading about hydrogen on Wikipedia, I read that hydrogen has a purple glow in its plasma state. This confused me because although hydrogen is present in its plasma state on the sun, the sun ...
3
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0answers
83 views

Specific Heat Capacity of Heavy Water

Water has an unusually high specific heat capacity due to it's hydrogen bonds. Why is it that the change in isotope causes a 10% difference in the heat capacity? How does the added neutron in the ...
13
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1answer
1k views

Why can't Pd/C and H2 reduce both the alkene and carbonyl portions of α,β-unsaturated carbonyls?

Why is it that the major product of the reduction of chalcones the ketone and not the monoalcohol? In other words, Why isn't the major product a benzyl alcohol? From what I understand, catalytic ...
1
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2answers
40 views

What happen to the Salt in Water Electrolysis [closed]

I haven't found yet what happen to the Salt Ions in Water during Electrolysis and is there an Electron Flow or Ion Flow. I have expierienced strong magnetic Forces between the Electrodes but couldnt ...
10
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2answers
686 views

Why is there a need of polar coordinates to solve the Schrödinger wave equation for the hydrogen atom?

Why is there a need of polar coordinate to solve the Schrödinger wave equation for the hydrogen atom? I went through some standard text books but I am feeling rather confused about the explanation.
0
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1answer
106 views

Hydrogen displaces lead?

there was a reaction in my book. It is as follows: $\ce{PbO + H2-> Pb + H2O}$ My question is Hydrogen is below lead in the reactivity series. Then how is this reaction possible?
1
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1answer
210 views

Why is there no neutron in protium?

My chemistry teacher told me once that every atom should have at least as many neutrons as protons, to keep the electrons from crashing into the nucleus. Protium, however, does not have any neutrons ...
0
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0answers
22 views

Hydrogen phase transition

A sample of hydrogen at a pressure of 7.10×10-2 atm and a temperature of 26.4 K is compressed at constant temperature to a pressure of 18.5 Which of the following are true? 1. One or more phase ...
0
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0answers
47 views

Thermal conductivity of Ortho and Para hydrogen

I know that ortho form of hydrogen has more intrinsic energy than para and so is less stable than para, which is less energetic. Since para is more stable, it should have less thermal stability than ...
0
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1answer
297 views

Question on the stabilities of ortho- and para-hydrogen

I have 2 questions to ask. can the stability of ortho-hydrogen greater than para-hydrogen can be stated as this? The intrinsic energy of ortho is greater than para-hydrogen and also with rise ...
0
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0answers
130 views

H2 molecule dissociation with respect to temperature

$\ce{H2}$ dissociation is only 0.081% at around 2000K and 95.5% at around 5000K, why? Is it because $\ce{H2}$ has the strongest bond among the elements with 1 electron in valence shell, and ...
0
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1answer
30 views

Is there a non-violent, practical way of making hydrochloride with only Hydrogen and Chlorine?

A way of making HCl gas is to put Chlorine and Hydrogen into a test tube and expose it to UV light. This reaction is however fast and strong and I would like to store the Hydrochloride from it. ...
0
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0answers
28 views

Converting Hydrogen in to Methane

I am in need of small amount of pure methane for laboratory purpose. I have hydrogen generator in the lab. Is there a possibility of generating methane from hydrogen ? May be make hydrogen flow ...
0
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1answer
267 views

Calculate how much hydrogen or oxygen will be produced in the electrolysis of water

Is there a way to exactly calculate the quantity of hydrogen or oxygen in a water electrolysis? I am thinking of a plain and simple electrolysis like an anode and kathode in salted water separating ...
1
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1answer
50 views

Hydrogen visible transitions

When dealing with electrons and the electromagnetic spectrum, why are there only four visible transitions in the hydrogen atom?
0
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0answers
43 views

charge on nascent atoms

What is the charge on nascent atoms? Like [H] or [O] I initially thought that they were like free-radicals, without any charge but having unpaired electrons instead. I asked my teacher, who said that ...
26
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3answers
3k views

Why are isotopes of hydrogen the only ones with special names?

Why does no other element but hydrogen get special names for its isotopes?
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1answer
59 views

Hydrogen bonding

It is mentioned in my textbook: "Hydrogen atoms of water molecule create strong electrical field due to their small sizes" How is the size related to electrical field and its strength? A little ...