Questions tagged [hydrogen]

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

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Molecular geometry of BaH2 according to VSEPR theory

I am asked to predict the correct molecular geometry of $\ce{BaH2}$ according to VSEPR theory. I assumed that it is linear due to barium being an alkaline earth metal and therefore not having any lone ...
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What is the anodic reaction of aluminum in water

Standard electrode potentials are reported for materials that are not usable as actual electrodes in water because they react spontaneously and rapidly. https://www.engineeringtoolbox.com/electrode-...
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Reaction between barium peroxide and hypochlorous acid

When $\ce{BaO2}$ reacts with $\ce{HClO},$ the question tells us that that oxygen, barium chloride and one other product is formed. The equation I came up with is $$\ce{BaO2 + 2 HClO -> BaCl2 + 2 O2 ...
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The rusting of steel may be promoted by brushing with HCl followed by brushing with hydrogen peroxide solution. What is the chemistry involved?

A welder showed me a way of promoting rust on steel by brushing on muriatic acid and then a hydrogen peroxide / water solution. What's going on, chemically speaking?
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Question on Hydrogen Balloon

I tried to extract hydrogen for my kid's birthday, by mixing caustic soda with water and aluminum foil (mixed in a glass bottle). A lot of heat and (hopefully)hydrogen was released. However, within 2-...
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hydrogen spectrum

In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series, Lyman series, Paschen series), What is common to the lines ...
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54 views

Lost track of the hydrogen in step 3 of the Krebs cycle

I'm trying to follow the Krebs cycle step by step, accounting for the number of hydrogens in each molecule before and after reactions. I've run into a problem starting from step 3. Isocitrate has ...
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Does the volume of water involved affect rate of electrolysis?

I am working on the design for a homemade PEM electrolyzer, and my goal is to make it as compact as possible, so as to allow easy transport. My question, as it relates to that, is whether - with the ...
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71 views

Azimuthal Quantum Number [closed]

In the radial equation of hydrogen atom the differential equation is described by But why is l taken to be integer. I know the principal quantum number n correspond to energy levels so that's why it'...
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35 views

Is the Hydrogen spectrum only an emission spectrum?

In a statement question it was stated that hydrogen spectrum is an emission spectrum and the scheme considered it to be ture. But my argument is that it can be both emission and abosorption spectrum. ...
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149 views

Can H+ ion exist independently? [duplicate]

Can H+ ion exist independently since it does need to form any bonds.Why do we say that it needs to be in H30+ ion form?
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597 views

Which is more stable: Ortho or Para Hydrogen? [duplicate]

It is known that Para-Hydrogen has opposite spin and Ortho-Hydrogen has same spin. Therefore, the energy of Para-Hydrogen is lower than that of Ortho-Hydrogen. Therefore, the stability order should be:...
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What does *oxidizing* have to do with *hydrogen*? [closed]

An oxidizing acid is a Brønsted acid that is a strong oxidizing agent. All Brønsted acids can act as oxidizing agents, because the acidic proton can be reduced to hydrogen gas. (source: Wikipedia) ...
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Naming and structure of PtCl4.2HCl (complex/coordination compound)

Given that $\ce{PtCl4.2HCl}$ when reacted with excess of $\ce{AgNO3}$ produced zero moles of $\ce{AgCl}$, I understand that all the chlorine atoms are inside the coordination sphere. But what will the ...
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90 views

Average bond energy of H−F and H−O hydrogen bonds

Which of the following hydrogen bonds (shown by the dotted line) has the highest average bond energy? A) $\ce{F-H\bond{...}F}$ B) $\ce{F-H\bond{...}O}$ I am thinking the answer is $A$ since the ...
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50 views

Is there more efficient reaction for generating hydrogen rather than HCl+Al [closed]

I want to generate hydrogen to acquire known pressure inside of an object. I have calculated required mole number for hydrogen using the ideal gas equation by giving wanted pressure, volume and ...
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At what pressure will hydrogen start to liquefy at room temperature?

I want to increase a fixed-size object's internal gas pressure by generating hydrogen in it, but I could not find the proper phase diagram for it. So I am wondering how high pressures I can get.
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How does the position of hydroxyl group in a nucleotide monomer affect the dehydration synthesis of nucleotides?

In dehydration synthesis of nucleotides, the hydrogen atom from the 3' carbon on the deoxyribose sugar of one nucleotide reacts with the hydroxyl group on the phosphate group of another nucleotide to ...
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216 views

Does changing the electrolyte concentration in the electrolysis of water affect the speed that hydrogen gas is produced at the cathode?

I am currently completing a Year 12 Extended Practical Investigation. Due to the lock-down restrictions we are unable to complete our own practical experiment and have been given sample answers with ...
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How do I get the smell of Febreeze (uncomplexed cyclodextrin composition) out of my carpet?

Help! I sprayed my old carpet, which had gotten a little mildewy from some wet towels left on it, with Febreeze original scent. Now I can't get that horrible scent out! It might also be mixed with ...
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63 views

Turning sun into water [closed]

I don't know if this question belongs here or on physics stackexchange, but I believe it leans more towards this site. A friend of mine had a strange but funny shower thought. He said: "What ...
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718 views

Which of the following has a stronger hydrogen bonding: F-H- -O or F-H- -F?

I thought of two approaches to solve this question . Since the electronegativity of Oxygen is lower than Fluorine it would be a better donor than Fluorine to the electron deficient Hydrogen . Another ...
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How to get the right formulas for combustion (rocket chamber) or where to find them? [closed]

I am a space enthusiast and am intrigued mostly by rockets. I recently found a book HOW to DESIGN, BUILD and TEST SMALL LIQUID-FUEL ROCKET ENGINES and have been fiddling around with rocket engine ...
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Where do the electrons in lead–acid battery come from? [closed]

$$ \begin{align} \ce{PbO2 + H2SO4 &-> PbSO4 + H2O + O} &\quad &\text{(anode)}\\ \ce{Pb + H2SO4 &-> PbSO4 + H2} &\quad &\text{(cathode)} \end{align} $$ The cathode’s $\ce{...
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Distance requirement for hydrogen bonding to occur

I am trying to understand the distance requirement for hydrogen bonding to occur (more specifically in the context of protein folding). There needs to be a donor and acceptor atom for bonding to occur....
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catalytic activity of Pd and Pt

what phenomenon takes place during catalytic activity of Pd and Pt during hydrogenation ? in some books it is given as absorption,in others adsorption .some say that it is occlusion . please help me
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Why isn't protium nucleus considered most stable nucleus?

My chemistry teacher told me that $\ce{^{56}Fe}$ is the most stable nucleus because of the highest binding energy per nucleon. But if we consider a protium nucleus, it has only 1 proton so there is no ...
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110 views

Does anyone know a database that shows the effect of electrolyte concentration on the production of hydrogen gas during electrolysis of water?

I'm currently studying in the International Baccalaureate model. This high school model asks their students to do an individual work called the Internal Assessment. One of the subjects I study is ...
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39 views

Could metal hydride storage tanks for hydrogen store helium as well, given their repective atomic radii? [closed]

With atomic radii very similar, could helium dissolve into metallic foam about as well as hydrogen, thus making metal hydrite hydrogen tanks suitable for helium as well?
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Efficiency of H production from FeOOH catalyst?

Research has recently found that FeOOH is 25 times better at hydrogen production than titanium dioxide. Today, a new electrolysis plant delivers energy efficiency of around 80%. Is 25x the Honda-...
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Is a compound that reacts with another to form hydrogen for fueling aircraft possible [closed]

Hydrogen is the most abundant element in the universe and has great properties when reacting with oxygen for use as a fuel. Yet here on Earth, its production is prohibitively expensive, its storage ...
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559 views

Why is H2Te the strongest acid among the following?

Among H2S, H2Se, H2Te the strongest acid is H2Te. The reason being that the bond strength in it the weakest so it dissociates easily. But my question is that why does it looses H+ in first place ...
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Are there other carbon free gasses that can be used for energy transport, apart from hydrogen? [closed]

Various gasses are currently used to transport and store energy for heating and electricity generation. Most of them contain carbon: Methane, propane, butane, carbon monoxide and natural gas. It ...
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Figure out how many deuterium atoms in a 3 microgram ice core sample

I'm in an introductory Chemistry class and ran into a Pearson problem, that no-one in our class including our professor has been able to truly figure out. I know the solution is $4.69 \times 10^{13}$...
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beer alcohol measurement

I bought an alcohol hydrometer (scale $0-40\%$) to measure the alcohol in my home made beer, at the end of fermentation and prior to bottling. While it is accurate on pure water (@ $0\%$), home made ...
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70 views

How to check whether intramolecular hydrogen bonding takes place in cyclic compounds?

How can we confirm or have a clear idea whether hydrogen bonding is taking place in substituents of cyclic compounds? For example, it takes place in ortho-nitrophenol, but it doesn't take place in ...
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2k views

Radius of hydride (H⁻) ion

What is the radius of the hydride $(\ce{H-})$ ion? There are several sources with conflicting reports on the same. Inorganic Chemistry: Principles of structure and Reactivity cites Pauling’s 1960 ...
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191 views

Hydrogen bonding in B(OH)4 - [closed]

How does hydrogen bonding affect hybridisation of species? I mean in $\ce{B(OH)3}$ the hybridization of boron is $\mathrm{sp^2}$ but in aqueous phase, is the hybridization same or it changes?
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What is the order of acidity for hydrogens in primary, secondary and tertiary alkanes, alkenes, and cycloalkanes [duplicate]

The bond dissociation energies of C-H bonds in alkanes, alkenes and aromatic compounds decrease in the following order: primary > secondary > tertiary > allylic > benzylic. The weaker the bond, the ...
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Which gas is a oxidizing agent as well as a reducing agent?

I think it's Hydrogen, because, $\ce{PbO + H2 -> Pb + H2O}$ Here $\ce{PbO}$ is reduced to $\ce{Pb}$ and $\ce{H2}$ acts as a reducing agent. But, in $\ce{2K + H2 -> 2KH}$, hydrogen gains a ...
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Have IH₃ and IH₅ already been synthesized?

I've seen a paper by Sikalov [1] that says that $\ce{IH3}$ and $\ce{IH5}$ should be observable. Has anyone actually tried to synthesize such molecules? References Sikalov, A. A. Hypervalent Halogen ...
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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 ...
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272 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 ...
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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,...
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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. ...
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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 ...
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861 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 ...
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782 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 ...
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127 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 ...
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144 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 ...

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