Questions tagged [hydrogen]

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

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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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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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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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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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294 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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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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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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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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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 ...
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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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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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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 ...
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338 views

Balmer and Paschen Series

If electron makes transition from, in $H$ atom, $6\rightarrow 2$ (to Balmer), then $\bar{\nu}_{{H}_{6\rightarrow 2}}=x$ (let). Also if electron makes transition from, in $He^{+}$ ion, so that $\bar{\...
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159 views

Can hydrogen alone be used as a fuel? [duplicate]

I have always thought that fuel such as petrol, diesel, etc.. are getting burnt to move the pistons in the car (I am not bringing physics). Why not hydrogen be used as a fuel but I know the incident ...
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Polarisation of electron clouds by partially positively-charged hydrogen atoms

Premise of my question: I was just wondering about this as I was writing a response to the question (linked here: Bicarbonate decomposition and pKa): Is it possible for partially positively-charged ...
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Where to buy/How to build a Devanathan-Stachurski cell?

I'm preparing to do some hydrogen permeation tests to calculate the diffusivity of some iron samples. I would like to do this using the Devanathan-Stachurski cell, which consists of two cells, one ...
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Why add acid to rid of soluble carbonate or hydroxide impurities? Will it not also react with halide I'm testing for

When identifying metal halides with silver ions, the positive ion $\ce{Ag+}$ will form $\ce{AgX}$ with halide in a solution. However, $\ce{H+}$ is added (typically in the form of an acid like $\ce{...
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Common hydrogen bonded liquids [closed]

For some experiments I need liquids with and without hydrogen bond which are pure or highly concentrated. I have only found $\ce{HNO3, CH3COOH}$ concentrated. But i need more liquids. And it would be ...
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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 ...
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Reaction of acids with water [duplicate]

Here is the reaction of $\ce{HCl}$ with $\ce{H_{2}O}$ I found on a website $$\ce{HCl + H_{2}O -> H^{+}(aq) + Cl^{-}}(aq)$$ However, in my text-book, the reaction is given as $$\ce{HCl + H_{2}O ...
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Compounds that Liberate Hydrogen from Water, Reversibly

I'm working on a paper which provides an overview of all the current methods for storing hydrogen gas as part of a renewable energy system, and I understand compressed gas and metal hydride storage ...
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Relative reacting tendency of H2/Pd towards double bond and triple bond in straight carbon chain

If both double bond and triple bond is present in a straight carbon chain the which one (double bond or triple bond) will be reduced by $1$ equivalent of $\ce{H2(Pd)}$ ? My guess is that the ...
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483 views

What types of ultraviolet light will ignite hydrogen?

I saw a reaction between hydrogen and chlorine ignite in the presence of UV light. I was wondering if the same thing would happen with something like near-ultraviolet light (around 400 nm). What kinds ...
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What is the link between hydrogen production and potassium oxide?

Is there an industrial process that produces hydrogen with potassium oxide as a catalyst? Or is there a process for the production of potassium oxide that has hydrogen as a by-product?
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Chemical reactions in plasma state

I am wondering about chemical reactions when the reactants are in a plasma state. Consider hydrogen and oxygen. Heated, these would react to form water. If hydrogen and oxygen plasma were combined, ...
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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, ...
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638 views

Can the hydride ion act as a ligand?

Hydride ion, as I know is a pretty powerful base, much stronger than hydroxide ion and cannot exist in an aqueous phase. Can it act as a ligand in coordination compounds? Hydride ion has its ...
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Forming hydrogen sulfide from electrolysis of sodium thiosulfate

So I was doing electrolysis on two silver electrodes and sodium thiosulfate. Some observations The voltage drops extremely fast from 2 V to less than 1 V in 15 minutes, possibly because of the ...
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Is there such a thing as an acid without a hydrogen?

I'm in AP Chemistry and we are learning about the Brønsted-Lowry model and my teacher mentioned that "for the most part" acids have hydrogen, could there be such a thing as an acid that has no ...
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How can I generate 250 GPa to create metallic hydrogen?

In the preparation of metallic hydrogen, how does one conjure up such immense pressures? I mean, I read that something like diamond anvils were used to contain the hydrogen, but now, in accordance ...
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Properties of metallic hydrogen

Given the possibility that metallic hydrogen may have recently been produced, and the massive media bloviation that followed, I am curious about some of the "properties" that I heard from multiple ...
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Why is the H-H Bond Dissociation Enthalpy so high? [closed]

"The H-H Bond Dissociation Enthalpy is the highest for a single bond between 2 atoms of any element."
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Why are some elements more abundant than others in the universe?

Hydrogen is the most abundant element in the universe. But what makes it so? At the time of big bang, what made certain elements more abundant than the others? I don't find this order of abundance ...
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Why is the entropy of deuterium greater than that of hydrogen gas

Why is the entropy of deuterium more than that of hydrogen gas? I thought about it but couldn't figure out a reason for why that would happen. Why would the number of neutrons in the nucleus ...
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Will Ammonia react with Gasoline mixed with Ethanol?

Recently the South Koreans invented a car that runs on an 70% ammonia 30% gasoline fuel mix. (link) In America we already have instituted policies that require refueling stations to mix Ethanol ...
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Notation of hydrogen

$$\ce{e- + H2O -> [H$\cdot$] + HO-}$$ I was a little confused on the notation of the hydrogen in brackets ([H]) in the product side of the reaction. Why is there a dot next to it and what does it ...
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Densest hydrogen storage medium [closed]

What compounds or nanostructures contain the most hydrogen atoms per unit of volume in realistic conditions (under 1 GPa). Particularly boron-free compounds because it's to be used in sci-fi nuclear ...
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How can difference in neutron number cause a difference in ionisation enthalpies?

It’s a well known fact that protium,deuterium and tritium have the same number of electrons and protons but different number of neutrons. It is expected that their ionisation enthalpies should be same ...
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What is the nature of interstitial hydrides?

In my Chemistry book(NCERT Chemistry,Part 2, textbook for class 11, Pg 281). I found the mention of interstitial hydrides: Unlike saline hydrides these compounds are nonstoichiometric, for ...
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Why do spin isomers of hydrogen (ortho and para hydrogen) change their nuclear spin with temperature variance?

My book says that ordinary dihydrogen contains 75% ortho and 25% para forms of hydrogen, while at significantly lower temperatures (like 20K) ortho and para hydrogens are 0.18% and 99.82% respectively....
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What is the difference between “atomic hydrogen” and “nascent hydrogen”?

My book (Comprehensive Chemistry by Dr. N . K. Verma, S. K. Khanna, Dr. B. Kapila) mentions two forms of hydrogen — "atomic" & "nascent". It says that these two forms of hydrogen are more ...
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Emission Spectrum of Hydrogen and Helium?

Why do hydrogen and helium have different emission spectra? I thought that emission spectra were the result of electrons 'jumping' from one energy level to the next - since hydrogen and helium both ...
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Is Nuclear Spin Isomer a kind of allotrope?

In my book there's a question: Does $\ce{H2}$ shows allotropy ? Enlist its allotropes and their application? I pondered over different way Hydrogen can be arranged(I don't know but I have weak ...
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Hydrogen atom transfer between enantiomers of rac-1-phenylethanol

(Taken from Dalton Trans., 2012, 41, 13423–13428. DOI:10.1039/c2dt31781h) I have difficulties understanding the hydrogen transfer in the image above. I always thought that hydrogen transfers followed ...
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When a molecule loses hydrogen atoms, does it become oxidised?

I had the following question on a bio test covering cell respiration and glycolysis, but I'm not sure if I agree with the answer. When a molecule loses hydrogen atoms (as opposed to hydrogen ions),...
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Is there any substance that is liquid at room temperature and pressure that doesn't contain H as one it's constituents apart from mercury? [closed]

I want to know if there's any substance that is liquid at room temperature and atmospheric pressure that doesn't contain HYDROGEN atom(s) in its make up. Any substance dissolved in water or any ...
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Oxidation state of hydrogen in the LaNi5H intermetallic

This question is from an introductory chemistry course: What is the oxidation state of $\ce{H}$ in $\ce{NaH}$, $\ce{HCl}$, and $\ce{LaNi5H}$? I've looked in the textbook to no avail. Google ...
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622 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 ...