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Questions tagged [hydrogen]

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

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Rate of benzene hydrogenation to cyclohexane [on hold]

Cyclohexane is manufactured from the reaction of benzene with hydrogen: $$\ce{C6H6(g) + 3 H2(g) → C6H12(g)}$$ If the initial concentration of hydrogen was $\pu{1.5 M}$ and $5$ minutes later the ...
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1answer
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Overlap matrix (H2 molecule, STO-3G)

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 ...
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1answer
43 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 ...
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1answer
50 views

Hydrogenation of 1-hexene with Raney nickel

For my high school senior chemistry project, I need to create and perform a lab. I've chosen to do the hydrogenation of 1-hexene with the catalyst of Raney nickel. I'm struggling because I'm not ...
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Why does only Hydrogen appear in the negative electrode my water electrolysis

Using this apparatus I conducted a water electrolysis. The aluminum foil curve surface is my negative electrode and the copper wire is the positive. The apparatus is submerged in tap water, but the ...
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1answer
25 views

Hydrogen storage using activated carbons

On Wikipedia, a possibility of using activated carbons to store hydrogen is reported. According to the Wikipedia page, this solution can be used to store around 5 wt% by cooling down the hydrogen to -...
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108 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. ...
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Separation of carbon mono-oxide and hydrogen

What is a shift converter in chemistry? For example in "inorganic chemistry by JD lee" while discussing the ways in which CO and $H_2$ can be separated the book stated that water gas(that is the ...
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1answer
80 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{...
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1answer
55 views

Why is hydrogen not very electronegative? [closed]

I looked at my reactivity series and I have just realized that hydrogen and carbon are both included in the series, even though they are non-metals. So why is hydrogen more electropositive than ...
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1answer
34 views

Can hydrides react with hydrocarbons? And why?

I have read there exist so called "magic" (super strong) acids which can provide a proton to saturated hydrocarbons, producing cation and hydrogen molecule. Can hydrides act in the same manner (pick a ...
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2answers
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What is the sense of electronic configuration of an atom if an electron can be in any superposition of energy eigenfunctions?

I recently started learning abou the quantum mechanical explanation of hydrogen atom. In the derivation of the wave functions of hydrogen atom we find its energy eigenfunctions. But according to the ...
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Hydrogenation of acetophenone

How does acetophenone Ni/H2 at 25 °C give a pair of enantiomers (given as chapter practice question in a book)? I thought it should just give ethyl benzene.
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1answer
38 views

Acids using different solvents [closed]

Many polar protic solvents exist and ionic compounds are able to dissolve inside these substances for the same reason as water. So, theoretically, if a substance were to steal a $H^+$ ion from a polar ...
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1answer
42 views

My confusion regarding Hydrogen peroxide

In Hydrogen peroxide, the oxidation number of oxygen is "-1" instead of "-2". But it seems to me that, the oxygen atoms have '-2' as their oxidation number as each oxygen atom here is connected to a ...
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2answers
331 views

Hydrogen bonds - why not in HCl? [duplicate]

In a textbook1, I found the following clear definition of hydrogen bonds: The strongest secondary bonding type, the hydrogen bond, is a special case of polar molecule bonding. It occurs between ...
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1answer
42 views

How does protium fusion produce helium? [closed]

In stellar nucleosynthesis, how is helium produced from a protium atom that has no neutrons?
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69 views

Inorganic reactions related to nascent hydrogen [closed]

My Question: My attempt: I know that option (A) & option (C) are correct option. But don't know about option (C) and in the answer all of them are correct. Can someone provide the ...
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1answer
756 views

Chemical equation that can be balanced in infinite number of ways?

When I was studying for my chemistry test, I found an equation that illustrates how to get water gas (carbon monoxide + hydrogen) out of methane. It is stated like this: $$\begin{align}\ce{2CH4 + CO2 +...
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1answer
70 views

Hydrogen venting: Why no flame arrestors?

I was reading the guidelines for safe venting of Hydrogen. One item says "no flame arrestors". Just wondering the scientific reason why flame arrestors may be frowned upon when for venting of most ...
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Is there the chemical component Hydrogen in Fire of any kind? [duplicate]

I know this sounds like a dumb question but I am wondering about the chemical composition of Fire, and it seems rather strange to me for the most part, is one of the compositions hydrogen since it ...
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Is photocatalysis of volatile organic compound always produce H, O, and C only?

I've read a journal about harvesting hydrogen from air pollutants (volatile organic compounds) with unbiased gas phase photoelectrochemical cell (ChemSusChem 2017, 10 (7), 1413–1418). I wish to ask ...
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Is neutron a compressed form of hydrogen atom?

As I know: $E_\mathrm{p} = \pu{938.272 MeV}, \quad E_\mathrm{e} = \pu{0.511 MeV}, \quad E_\mathrm{n} = \pu{939.565 MeV}$ $E_\mathrm{n} − (E_\mathrm{p} + E_\mathrm{e}) = \pu{0.782 MeV}$ $M_\...
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Would a hydrogen/oxygen fuel cell be a good choice for energy storage and generation in H2 rich atmospheric environments?

So imagine an atmospheric probe sent to enter the atmosphere of a giant gas planet. There would be no need to store hydrogen since a compressor or an inlet with sufficient dynamic pressure would allow ...
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Bond dissociation energy of the trihydrogen cation

Recently, in one of the questions in an assignment on the topic of energetics, we were asked to explain why the bond dissociation energy for the trihydrogen cation is much larger than what we would ...
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Why isn't pure ortho hydrogen possible to obtain?

In school, I've learned that we can only get an ortho hydrogen content upto 75%. Why is that we can obtain a pure sample of para hydrogen, but not ortho hydrogen? What prevents us from isolating ortho ...
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What bond exists in “red oxygen”, and can something similar happen with hydrogen?

"Red oxygen" is the nickname for O$_8$. It only exists at extremely high pressures. What kind of bond does it have? Can hydrogen theoretically have something similar at very high pressures too?
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is rydberg constant and rydberg unit are same? [closed]

i want to ask a question that.is rydberg constant and rydberg unit are same. UNIT OF RYDBERG CONSTANT IS m^-1, right? Then what is rydberg unit.
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Can hydrogen plasma reduce carbon dioxide?

There are several studies describing usage of hydrogen plasma to reduce metal oxides. This is not yet widely adopted in industry, but it is of interest for environmental reasons (such as desrcibed in ...
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1answer
210 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 ...
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1answer
124 views

Creating water from hydrogen and oxygen [closed]

Assuming a scientist has two canisters: One with a liter of pure gas of hydrogen (single atoms gas), and one with half a liter of pure gas of oxygen (single atoms gas). The scientist desires to ...
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1answer
381 views

How can we obtain very pure hydrogen? [closed]

Very pure hydrogen (99.9) can be made by which of the following process ? (A)Electrolysis of water (B)Reaction of salt like hydrides with water. As per my knowledge the answer should be (B) but I ...
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Why an acid form h3o+, not h3o [duplicate]

When a lone proton bonds onto an H2O molecule in an acid, why doesn't the proton bond with a pair of the lone electrons in H2O and satisfy its electrons needs by having 3 single bonds? Why is it still ...
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1answer
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Can we use liquid hydrogen to power a conventional engine? [closed]

Hydrogen has the best fuel efficiency, so if we were to use it in our engines wouldn't their efficiency increase as well. The engines would require changes and all but would it be plausible to have ...
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1answer
80 views

Why is moist hydrogen made to react with chlorine to give hydrogen chloride?

Moist hydrogen reacts with chlorine in diffused sunlight to give out hydrogen chloride. Why is moist hydrogen used? Why not dry hydrogen?
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1answer
122 views

Absorption spectrum of Hydrogen molecule in UV region 200 nm - 300 nm (not Atomic Hydrogen)

Can somebody provide Absorption spectrum of Hydrogen molecule? I have searched days for absorption spectrum of Hydrogen molecule in 200 nm - 300 nm UV region and All I got is absorption spectrum of ...
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396 views

How to separate two or more gases into different containers

I know this is probably an incredibly stupid question, but I'm making a hydrogen generator for a project. The basis of it is electrolysis of baking soda and water, which apparently gives off hydrogen, ...
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What is the difference between lower explosive limit (LEL) and lower flammability limit (LFL) for hydrogen?

I just need a bit of help clearing up the difference between Lower flammability limit (LFL) and lower explosive limit (LEL)? From https://environmentalchemistry.com/yogi/periodic/H.html It was ...
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2answers
160 views

Could you make a helium atom from hydrogen gas? [closed]

Hydrogen gas is $\ce{H2}$, and contains 2 electrons and 2 protons. My question is, with sufficient pressure, could you fire two neutrons at the molecule and have them form a single Helium atom?
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Electronegativity Of Isotopes Of Hydrogen

I would like to know what is order of increasing electronegativity (If not the exact Pauling scale values) of the three isotopes of hydrogen, since they were no where to be found on the internet, also ...
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3answers
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Is water a possible fuel for jet engines? [closed]

Jet engines can run on almost any fuel, and the operating temperatures of modern jet engines' hottest sections are anywhere between 3000 and 3150 degrees F (1648 and 1732 degrees Celsius). Does that ...
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1answer
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How many peaks of HCl are found in a mass spectrum?

In a mass spectrometer some hydrogen chloride molecules will split into atoms. Chlorine has two isotopes. The hydrogen involved here is the isotope $\ce{^1_1H}$ only. How many peaks does a mass ...
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Allotropes of hydrogen

Is it possible to chemically bond 8 hydrogen atoms together to form an allotrope like $\ce{H8}$?
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Implication of completely non relativistic Hamiltonian

I am studying the Application of perturbation theory to hydrogenic atoms subject to internal or external electromagnetic fields. The very first equation it uses is the hamiltonian of hydrogenic ...
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1answer
5k views

Reaction between magnesium metal and sodium hydroxide: Does this even happen?

Came across this question in a book: Among aluminum, zinc, tin and magnesium, which metals (if any) will react with an aqueous solution of sodium hydroxide to displace dihydrogen? The answer to ...
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1answer
268 views

Mechanism for interconversion of spin isomers of hydrogen

What is the mechanism by which spin isomers of hydrogen switch between the ortho and para forms? If such a mechanism exists, why does ortho-hydrogen not increase in concentration on increasing ...
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1answer
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Hydrogen evolution during thermal spray

Firstly, let me state that I'm no chemist. My specialty is in thermally applied coatings such as electric-arc metalizing. During the course of my career I've always been presented with vague ...
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Why is hydrogen peroxide soluble in ether?

I'm a student in the 11th Grade. Recently I learned that $\ce{H2O2}$ is soluble in ether. According to my previous knowledge, ether is a non polar solvent whereas $\ce{H2O2}$ is Polar and only polar ...
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1answer
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Can reaction of gastric acid with swallowed things be dangerously exothermic?

Okay, okay. I know that swallowing a large enough amount of any substance would be considered dangerous. That isn't the point of this question, however. As you probably know, the stomach has ...
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1answer
778 views

Are there any significant uses of the compound formed by magnesium and anthracene?

In an unusual reaction, magnesium reacts with anthracene in THF to form a grignard-like compound called, prosaically, magnesium anthracene: I remember using it briefly in the 1980s. At the time there ...