Questions tagged [hydrogen]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
30 views

Why should we be interested in catalyst for electrolysis?

I've been reading papers on Phosphided metals (CoP, NiP, FeP) as a catalyst for electrolysis. They increase the current density of the cell for a voltage. If it still requires 39.4 kilowatt-hours ...
14
votes
1answer
11k 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 ...
0
votes
1answer
80 views

Does magnesium carbonate exist? what makes magnesium bicarbonate different from calcium bicarbonate [closed]

In my book, I found the following reactions: $\ce{Ca(HCO3)2 ->[\Delta] CaCO3 + … }$ $\ce{Mg(HCO3)2 ->[\Delta] Mg(OH)2 +...}$ What makes these two reactants different? Why is one forming ...
2
votes
3answers
5k views

Is it dangerous to inhale the steam coming from electrolysis of salt-water solution [closed]

Is chlorine in there that accumulates (at the anode) and emerge out as chlorine gas? I was worried since I added a pinch of salt to the steamer in order to hasten the heating of tap water when I ...
12
votes
2answers
3k views

Would sodium explode in salt water?

I’ve seen the video etc of sodium being put into freshwater and the reaction of flames/small explosion but I wonder if the same reaction would occur if conducted in salt water such as the ocean.
0
votes
1answer
28 views

Ionization of hydrogens in hypophosphorous acid

Does anyone know why the hydrogen atoms bonded with phosphorus in $\ce{H3PO2}$ are not ionizable? I tried looking in high school level books, but they only describe the process, not the real reason. ...
0
votes
1answer
30 views

Typical reaction yield for combustion of hydrogen [closed]

I am writing an essay on the chemistry of rocket fuel, and I was wondering what, if any, would be a commonly accepted value for the actual yield of the reaction between hydrogen, $\ce{H2},$ and oxygen,...
-1
votes
1answer
26 views

Hydrogen reactor, with electrolysis [closed]

I was thinking about hydrogen reactors. How they turn hydrogen and oxygen into water. I just learned about electrolysis, so I was curious how efficient it would be, to fill a cars tank up with ...
2
votes
1answer
54 views

Why do bubbles form when a reactive metal is placed in a less reactive metal's salt solution?

What is the gas that if formed when a reactive metal is placed in a salt solution of a less reactive metal? Theoretically, it should just be a simple displacement. I know that this question has been ...
7
votes
2answers
6k views

What is difference between H⁺ and proton?

What is difference between $\ce{H+}$ and a proton?
2
votes
2answers
183 views

Amperage for the electrolysis of water?

I am electrolysing water using several different potential catalysts for my eight grade science fair project. The electrolysis will be running at 2 to 2.5 volts over nickel electrodes, as I do not ...
0
votes
1answer
769 views

How was water formed if oxygen and hydrogen exist as molecules?

I have learnt that both hydrogen and oxygen exist as molecules. If so how was $\ce {H2O}$ formed? In water there is two hydrogen molecule and one oxygen atoms but how is this possible? Oxygen only ...
2
votes
0answers
47 views

Using a the particle in a box - one dimension, to calculate the zero point energy of an hydrogen atom

I have been tasked with using the one dimensional particle in a box model to calculate the zero point energy of an hydrogen atom with different sizes. Using the formula $E_1=h^2/(8mL^2)$ for a box ...
37
votes
6answers
62k views

Why do we use helium in balloons?

While I was looking at the periodic table today, I realised that there were gases that were much lighter than helium such as hydrogen. If hydrogen is lighter than helium, why do we insist on using ...
0
votes
1answer
8k 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 ...
6
votes
1answer
10k views

Why does hydrogen burn with a pop sound?

Our teacher made us to do an experiment with zinc granules and hydrochloric acid. $$\ce{2HCl + Zn -> ZnCl2 + H2}$$ We collected the hydrogen gas that was evolved in a test tube and on ignition, ...
1
vote
1answer
45 views

Why carbon monoxide reacts with hydrogen to give different products in the presence of different catalysts

My books says how carbon monoxide will react with hydrogen to give different products with different catalysts, but how exactly do different catalysts yield different products. Do they provide ...
-1
votes
1answer
111 views

H and H- atomic and ionic radius [closed]

A hydrogen anion has a bigger radius than neutral H . Why is this happening ? I mean both electrons exist at the same shell so this is not it. Both H- and H have 1 proton so this is not it as well . ...
6
votes
1answer
319 views

Mechanism for interconversion of spin isomers of hydrogen

What is the mechanism by which the ortho- and para- spin isomers of hydrogen interconvert? If such a mechanism exists, does this mean that ortho-hydrogen increases in concentration on increasing ...
7
votes
2answers
5k views

Why are hydrogenation reactions exothermic?

I learned 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 ...
3
votes
0answers
49 views

Why is triatomic hydrogen relatively short-lasting?

The first chapter of Fleming's "Molecular Orbitals and Organic Interactions," describes the formation of triatomic hydrogen. In summary, the sigma MO of diatomic hydrogen interacts in phase with the ...
4
votes
2answers
447 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 ...
12
votes
3answers
4k views

Difference between Lindlar and Rosenmund catalysts

Is there any difference between the Lindlar and Rosenmund catalysts? I've checked around, and it seems the same compounds are used to make both. Is there a difference in their reactivities or are they ...
1
vote
1answer
77 views

Most dense hydrogen containing composition [closed]

I am searching for a composition which could host the most hydrogen atoms in a specific volume. Note that this density is sought for justifiable conditions in terms of pressure, temperature, ... and ...
0
votes
1answer
69 views

How can I neutralise H2 gas without burning it? [closed]

I was thinking of maybe making it bubble into a solution containing something that would react with H2 yielding either a dissolved substance or a precipitate from the reaction. Maybe a solution with ...
1
vote
4answers
3k views

Lifetime of a (reversible) hydrogen fuel cell system

I am trying to determine how long a system that constantly converts water into H and O and then back will last, as in roughly how many cycles. Now this system can either be made of say a reversible ...
0
votes
1answer
67 views

Why does hydrogen burn spontaneously in fuel cell at room temperature?

It's well known that if you mix $\ce{H2}$ and $\ce{O2}$ in ambient conditions, the $\ce{H2}$ will be stable indefinitely, and will only react with $\ce{O2}$ to form water when ignited by a flame. The ...
14
votes
3answers
3k views

Reaction mechanism of combustion of hydrogen

After a discussion about the usefulness of hydrogen fuel for cars with a friend of mine, I wondered what the reaction mechanism for combustion of $\ce{H2}$ was. I only study (well almost) organic ...
4
votes
2answers
206 views

Gas chromatography flame ionization detector (FID) - why hydrogen gas?

Why is $\ce{H2}$ used in an FID, apart from the fact its combustion does not contaminate the flame? In other words, is the temperature of the flame important or critical? Is the stability of the ...
2
votes
1answer
403 views

Is a hydrogen molecule smaller than hydrogen atom?

Recently I came across a textbook of physical chemistry which stated the following: In the formation of a stable hydrogen molecule, two hydrogen atoms share a pair of electrons between them and two ...
0
votes
0answers
29 views

Ordering the lines obtained in the H line spectrum based on energy they possess

I am trying to do the following question which asks me to calculate the wavelength of the green line in the visible spectrum of H. The authors claim that the green line is the second most energetic ...
-2
votes
1answer
375 views

Inorganic reactions related to nascent hydrogen [closed]

Nascent hydrogen is prepared by (A) $\ce{Na}$ and $\ce{C2H5OH}$ (B) $\ce{Al}$ and $\ce{NaOH}$ (C) $\ce{Zn}$ and dil. $\ce{H2SO4}$ (D) All of these My attempt I know that option (A) &...
12
votes
3answers
2k views

On the stability of deuterium

The isotope of hydrogen, tritium, is indeed radioactive resulting in $\ce{^3He}$ through beta decay. But what of the radioactively 'stable' isotope deuterium? Are all deuterium atoms destined to be ...
3
votes
1answer
80 views

Home-grown diamond using CVD

I want to make a diamond at home using chemical vapor deposition (CVD). If I use a metal chamber filled with methane and hydrogen gas and heated with a microwave oven oscillator element, will the ...
0
votes
0answers
64 views

Converting hydrogen 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 ...
-1
votes
1answer
306 views

Standard litres to kg conversion for Hydrogen [closed]

When looking at hydrogen fuel tanks, they often give the capacity in terms of "standard litres". However, I can't find a definition of what this is. I assumed this may mean a litre of hydrogen gas ...
0
votes
0answers
46 views

Can a Hydrogen Radical form in a chemical reaction?

Original question: During kolbe electrolysis of Formic acid, H2 is released at which electrode? What I thought: H2 will form at cathode due to reduction of water. But will the Formic acid decompose ...
1
vote
1answer
2k views

Hydrogen gas' reducing property

I just went though a reaction wherein hydrogen gas is liberated and hence restricts the product formed to ferrous and not ferric salt. I just want to know how H2 gas gets its reducing property? It has ...
7
votes
1answer
127 views

Why do we need to add hydrogen to amorphous silicon?

I was recently studying about Staebler-Wronski effect observed in amorphous silicon (a-Si). I realised it was due to imperfections in the lattice structure and breaking of Si-Si bond to Si-H bonds. ...
15
votes
4answers
52k views

Why is formic acid a stronger acid than acetic acid?

I am told that because the methyl group is electron donating in the conjugate base of acetic acid, this destabilizes the conjugate base by exacerbating the existing negative formal charge on the ...
0
votes
0answers
42 views

Comparing acidity in 3,4-dihydroxyfuran-2(5H)-one and 2,3-dihydroxycyclopent-2-en-1-one

I have two compounds with two hydrogens namely (a),(b),(c) and (d). I have to compare the acidity of the following hydrogens. My approach: I removed the hydrogen atoms one by one and compared the ...
14
votes
4answers
27k views

How explosive is hydrogen gas?

I want to electrolyze water to get oxygen and hydrogen. I want to mix them in a regular balloon and ignite it. How much hydrogen would you need in a 2:1 ratio with air for it to be dangerous? Is this ...
-3
votes
2answers
231 views

Pre-Hydrogen Feature On the Output Of a Gas Chromatography Thermal Conductivity Detector

A candidate for "dark matter", predicted and now apparently detected to have both a higher thermal conductivity and higher diffusion rate than H2 is purported in this PowerPoint Presentation file. ...
0
votes
1answer
392 views

Pure Hydrogen and Dry Hydrogen Difference [closed]

Do pure and dry hydrogen are the same? What does dry hydrogen actually means. And what does pure hydrogen means.
8
votes
3answers
870 views

How to add hydrogens to a crystal structure?

PDB protein crystal structures most of the time lack hydrogen atoms. Usually I use PyMOL (h_add) but it does not always seem to be giving the correct result. What ...
0
votes
2answers
6k 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(\...
2
votes
1answer
274 views

Overlap matrix (H2 molecule, STO-3G) [closed]

I'd want to implement SCF method using Modern Quantum Chemistry (Szabo). But when I want to calculate overlap matrix for H2 (STO-3G basis) my results aren't equal to true overlap matrix that there's ...
-1
votes
1answer
205 views

Slope of Graph of Wave Number vs inverse square of the principal quantum number(1/n^2) in Hydrogen Emission spectrum

What is the final expression we get for wave number in a hydrogen emission spectrum? Let us say for example from 6 to an orbit $n$. Considering that it is an emission spectrum, I think it would be ...
3
votes
1answer
126 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 ...
8
votes
1answer
110 views

Does the hydrohelium dication exist?

It is well-known that there exists the $\ce{He2^2+}$ dication, and also $\ce{HHe+}$ and $\ce{H2+}$ cations. But I could not find any definite information about the existence or inexistence of the $\ce{...