Questions tagged [hydrogen]
Questions regarding the chemical properties of hydrogen and its behavior in reactions and compounds.
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Is size or electronegativity more important in acidity?
For the molecule below, is the hydrogen with the oxygen more acidic or is it the one with sulfur?
Since both parts have the same number of resonance structures, I'm guessing it just boils down to ...
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Is it possible to make a reversible "Solid State" Hydrogen fuel cell using Ammonia Borane and Iron Oxide? [closed]
Well, I saw this video about hydrogen reduction, in which pure hydrogen gas is exposed to iron oxide at high temperatures, producing water vapor and leaving pure iron behind.
And as such, I wondered ...
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Why is tritium radioactive?
The nucleus of tritium (hydrogen-3, $\ce{^3H})$ contains one proton and two neutrons. Nothing repulsive is acting on the proton that can make the nucleus unstable. Then why does it decay?
I suspect ...
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What are disadvantages of methane or ammonia compared to dihydrogen for metal ore reduction?
Metallurgy, such as steel-making processes, require reducing agents to get rid of the oxygen in metal ores. Using fossil coal for this is a large source of $\ce{CO2}$ globally. Recently, I have read a ...
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Relationship of acids and bases with pH. (Proportional Relationship) [duplicate]
Can someone please clarify the relationship between acidic-basic strength and pH? I have come across conflicting information and am unsure about the correct understanding.
Some people including my ...
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How do the orbitals in atoms synchronize their phases during the formation of a bond?
Suppose I have two hydrogen atoms, each with one electron in their 1s orbital. Then we can represent the wave functions of these two as say $|\Psi\rangle_1$ and $|\Psi\rangle_2$ for each of the two ...
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Does Hydrogen Gas need to be bubbled in during Reduction of the electrode?
I have read in textbooks and websites that hydrogen gas needs to be bubbled into the SHE (Standard Hydrogen Electrode). I understand why for oxidation of the half cell - the gas is oxidised into H+ (...
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Chemical Test for Hydrogen
I know that to perform a chemical test for $\ce{H2}$ we have to take a burning candle flame near to the mouth of the test tube and a blue flame with a characteristic pop sound confirms the presence of ...
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Is potassium Sulfate a good electrolyte for the production of oxy-hydrogen?
I am currently conducting an electrolysis experiment using a 30 amp power supply with a voltage ranging from 10 to 16 volts.I am thinking of using potassium sulfate (K2SO4) dissolved in water as an ...
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Ortho- Para- Hydrogen Names and Benzene
I read that the Hydrogen atoms with nuclear spin in same direction are called Ortho- Hydrogen whereas those in opposite nuclear spin are Para- Hydrogen. But is there any resemblance of such a ...
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How do metal hydrides behave in a non-hydrogen closed system?
I am curious about the fundamentals of metal hydrides and how adsorption/desorption works in non-hydrogen systems. My understanding is that the atom ratio M/Hx of the metal hydride is a function of ...
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Why do H and Li bond so differently with a hydroxide?
I am sure I am asking a very basic question but before coming here, I have made multiple attempts to find an answer elsewhere. Or maybe I am simply asking the wrong question, in some sense. If someone ...
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Can molecular hydrogen form hydrogen bonds?
Basically, I want to know if molecular hydrogen (H$_2$) can form hydrogen bonds with other molecules (CH$_4$, CO$_2$, N$_2$). I'm trying to model the mixture of these molecules with SAFT equations of ...
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Mystery GC peak appearing between 1H2 and various molecular combinations of 1H, 2H and 3H?
The following gas chromatograph, taken from "Review of the different techniques to analyse tritium", labels all but the largest peak. Given that the analyte is likely to be from some source ...
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Using Hydrogen as a carrier gas for a GC; consideration of reactivity with analytes
In many cases people use H2 as a carrier gas for a GC. But does this exclude analysis of (say) systems with unsaturation or aromatic compounds etc. If a analysis uses a temperature program say up to ...
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Determining volume of hydrogen gas evolved in water splitting reaction
I want to carry out a photocatalytic water spliting reaction. This reaction will generate Hydrogen and Oxygen gas in 2:1 ratio according to the following reaction -
2H2O + energy (light) → 2H2 + O2
So,...
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How does hydrogen and oxygen combine to make water? [closed]
When two hydrogen atoms fuse with one oxygen atom to create a molecule of water, each hydrogen atom donates its single electron to the oxygen atom, resulting in 10 electrons for the oxygen, instead of ...
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Do PEM Fuel Cells suffer CO poisoning at the oxidizer side?
Reading about PEM Fuel Cells, first on Wikipedia then on some other sites, I notice they talk a lot about the problem of CO poisoning. But almost always it's explicitly referred to as a problem in ...
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Difference between sodium aluminate and sodium metaaluminate
So I was studying Chemistry (Hydrogen - Uses, Properties and Preparation) from 2 different textbooks (based on Grade 9 syllabus, I.C.S.E. Board, India) and I found what seems an astounding anomaly to ...
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Are hydrocarbons compounds of hydrogen and carbon, or carbon and hydrogen?
Is it the same to say "Hydrocarbons are compounds of hydrogen and carbon." as saying "Hydrocarbons are compounds of carbon and hydrogen."
I got a B in my chemistry test just ...
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When hydrogen and oxygen reacts, what defines if it will turn into hydrogen peroxide or water?
If you have a jar with oxygen and hydrogen inside, I'm interested in knowing what variables are most important to ensure that the mixture will become water (if that was the goal) or hydrogen peroxide, ...
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Average molecular distance between hydrogen gas [closed]
The whole question goes like this:
Calculate the de Broglie wavelength of hydrogen molecule at 300K (Take the translational energy to be 1.5kT) Compare this to the average intermolecular spacing for ...
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Can deuterium be separated from heavy water via electrolysis? It is an isotope of hydrogen, so I guess it should act in the same way?
I was wondering if it is possible to separate deuterium from heavy water via electrolysis.
Also, is this the way deuterium gas is obtained on an industrial scale, or are there better methods?
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How to calculate the solubility for the hydrogen concentration based on the pressure and temperature in the Metal Hydride Hydrogen compressors?
My name is Ketan Karkare and I am a student in the University. I am currently working on the metal hydride compression and have gone through the following paper: Mathematical modeling for the PCT ...
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Titanium-free catalysts to decrease decomposition temperature of magnesium hydride
Magnesium hydride $(\ce{MgH2})$ is a metal hydride with a relatively stable structure, at least compared to other metal hydrides. Magnesium hydride splits at around 300 °C into magnesium and hydrogen. ...
user123716
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Has dilead hexahydride been synthesised?
Dilead hexahydride is listed on Wikipedia as a compound composed of two lead atoms, and six hydrogen atoms:
H H
| |
H-Pb-Pb-H
| |
H H
As the wikipedia ...
user123716
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Confusion regarding classification of hydrides
According to my book,hydrides are classified as Ionic/Saltlike/Saline Hydrides, Covalent/Molecular Hydrides and Metallic/Non-stochiometric/Interstitial Hydrides.
The explanation of my book is not very ...
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Conditions for Pd/C reduction of alkene
I am trying to do a $\ce{H2}$ reduction of cyclic alkene (otherwise simple hydrocarbon with 1 methyl group along with the chain about the weakly-strained cycle) using $\ce{Pd/C}$, the cycloalkene ...
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What material(s) can offer similar performance to polyurethane in a paint coating, but with less hydrogen?
We need to coat parts of an neutron instrument with a boron shielding coating. This currently is achieved using an airbrush gun with a paint mix of demineralized water, polyurethane and boron powder.
...
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What will be the product of 1 eqv Benzene reacts with 1eqv H2? [closed]
how equivalent concept is applied in the above problem, Kindly help me out with the answer and proper explanation.
As, I am getting confused in mole concept and equivalent concept here.
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What are oxidation numbers of each element in CuH?
My chemistry teacher said hydrogen when bonded with metals has oxidation number (O.N.) of −1 except CuH: in CuH the hydrogen has O.N. +1 and the copper has O.N. −1.
But on the internet it is ...
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What is the number of acidic hydrogens and the n-factor of hypophosphorous acid?
My teacher said that the hydrogen which is directly linked with oxygen or more electronegative atom is an acidic hydrogen, and that the $n$-factor for an acid is the number of acidic hydrogens.
Then ...
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How many hydrogen environments are there in phenyl acetic acid? [duplicate]
How does the molecule below have only three hydrogen environments? Should it not have 5 different hydrogen environments according to the labelled diagram?
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I need to test fabric for arsenic, and I've found 141-year-old guidance. Is it legit?
I'm a book and paper conservator, and a few years ago had four books to restore. Their endpapers were this gorgeous green silk, but they were badly dry rotted, and needed to be removed. I suspected ...
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Comparison between Atomic Spectrum of Hydrogen and Alkali Metals
I posted a question on Chemistry Stack Exchange a while back. It was related to the naming of atomic orbitals. One of the answers to it mentioned a research experiment. The link to the question is ...
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How to calculate ionization energy of an atom provided energy of the electron at ground state? [closed]
It is given that in ground state the energy of electron in hydrogen atom is $-2.18\times10^{-18}\mathrm{J}$. I'm required to calculate the Ionization Energy in kJ/mol
Question for reference:
At ...
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Hydrogen Dispersion in room [closed]
I need to measure the concentrarion of pure hydrogen in a room caused by leakage or exhaust gases to evaluate the risk of ignition. Maybe there is some model available for indoor locations, similar to ...
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How is PEMFC not a violation of the Laws of thermodynamics
I was trying to understand how the proton-exchange membrane fuel cell works.
Online I read that in such a cell hydrogen is oxidized at an anode catalyst, mostly platinum, and a detached electron ends ...
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Hydrogen fuel cell purity / concentration
This is a chemistry/technology kind of question. Some PEM fuel cells work with a rated hydrogen purity of 99.99%.
What would happen if the fuel cell stack is supplied with a hydrogen purity/...
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Is water hydronium and hydroxide? [closed]
In our chemistry lesson when learning about the Bronsted-Lowry definition for acids and bases, we came across the reaction...
H2O + H2O -> H3O+ + OH-
...Where water is amphiprotic which means it ...
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Hydrogen safety during electro-chemical machining
I'm interested in doing some experiments with electro-chemical machining in my shop. The process involves running electricity through an electrolyte (salt water) to break down a metal anode (aluminum/...
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Smell produced in reaction of sodium hydroxide and aluminium
I was doing an experiment with $\ce{NaOH}$ dissolved in some $\ce{H2O}$ and aluminium. My textbook says that the following reaction takes place
$$\ce{2 NaOH + 2 H2O + 2 Al -> 2 NaAlO2 + 3 H2}$$
It ...
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Nanoscale hydrogen batteries that use water-splitting technology
It was claimed in this article in 2019 that a nano-battery using water splitting technology is developed. It is described as:
The battery gains its charge by interacting with water molecules present ...
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atomic structure - why only hydrogen be separately written in periodic table [duplicate]
The other
exception is hydrogen. It has only one
s-electron and hence can be placed in group 1
(alkali metals). It can also gain an electron to
achieve a noble gas arrangement and hence it
can behave ...
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water to hydrogen to water [closed]
I'm trying to find out if there is any loss of water when converting water to hydrogen and then back into water and can't find an answer anywhere I've searched. I understand that the water produced is ...
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What is the mass of a proton?
My textbook explains that the deviation from integer atomic mass is caused by mass difference between proton and neutron, which are $1.67262·10^{-27}$ kg and $1.67493 ·10^{-27}$ kg, respectively.
If ...
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Ease of reaction of hydrogen with alkali and alkaline earth metals
The ease of reaction of group 1 metals with hydrogen decreases as we
go down the group.
But why lithium requires high temperature than sodium, potassium and
rubidium?
What is exactly "ease of ...
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Hydrogen atom orbital projections resemble to some Chladni figures! Mathematical reasoning?
Chladni figures are formed by sprinkling salt on a vertically vibrating membrane, f.e. . Some of them are purported to be projections of hydrogen atom orbitals f.e. 1s, 2s, 2p, 3d, e.t.c., f.e.
One ...
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Why are protons more common than hydride ion?
I'm a high school student. I noticed $\ce{H+}$ ion is commonly present in my books while I didn't find any presence of $\ce{H-}$ ions in my books. However, I found on internet that $\ce{H-}$ also ...
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How can 2 molecular orbitals form simultaneously? [duplicate]
I understand (for example in the case of H2) that two s orbitals produce through constructive interference a bonding orbital and that the out of phase combination of two s orbitals leads to ...
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