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

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Hydrogen visible transition [duplicate]

Why is there only four visible transitions in the hydrogen atom? What causes the hydrogen atom to only have the four visible transitions?
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Hydrogen visible transitions

When dealing with electrons and the electromagnetic spectrum, why are there only four visible transitions in the hydrogen atom?
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31 views

charge on nascent atoms

What is the charge on nascent atoms? Like [H] or [O] I initially thought that they were like free-radicals, without any charge but having unpaired electrons instead. I asked my teacher, who said that ...
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3answers
2k views

Why are isotopes of hydrogen the only ones with special names?

Why does no other element but hydrogen get special names for its isotopes?
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32 views

Hydrogen bonding

It is mentioned in my textbook: "Hydrogen atoms of water molecule create strong electrical field due to their small sizes" How is the size related to electrical field and its strength? A little ...
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1answer
47 views

What typically happens to H2 molecules released into atmosphere (with no spark source)?

I'm wondering what happens when H2 leaks from say a transmission pipe in an unenclosed area. No immediate source of ignition, I know it rises more quickly than helium (x2 I believe) and dissipates in ...
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2answers
96 views

Reliable automatic addition of hydrogens and charge assignment to small molecules at given pH?

I have some molecular PDB structures with missing hydrogens. Is there a software available that places missing hydrogens and assigns a charge to the molecule that is reliable? I have used Avogadro to ...
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1answer
290 views

Why are hydrogen ions always associated with another molecule?

I was reading N.C.E.R.T. class XI part 2 book and chapter Hydrogen,when I came across this statement: Loss of the electron from hydrogen atom results in nucleus ($\ce{H+}$) of ~1.510–3 pm size. ...
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2answers
87 views

Comparing heat of hydrogenation per mole of butenes and 1,3-butadiene

The question asks us to select the compound with the smallest heat of hydrogenation per mole out of the following: a) 1-butene b) trans-2-butene c) cis-2-butene d) 1,3-butadiene Since all four ...
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1answer
82 views

What is the bonding type in hydrides of group 2 elements?

In one of my MCQ questions, there was a statement saying all group 2 elements form covalent hydroxides. I know it is incorrect. I know that $\ce{BeH2}$ is a covalent hydride. What about the rest? Are ...
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1answer
51 views

Is there an electrolyte that will halt the production of Hydrogen in water electrolysis?

Care must be taken in choosing an electrolyte, since an anion from the electrolyte is in competition with the hydroxide ions to give up an electron. An electrolyte anion with less standard ...
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1answer
36 views

What fraction of hydrogen in air results in an explosive mixture?

I would like to know if there is documented evidence of the quantity of hydrogen to air that must be present in the mixture to risk explosion or flame.
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1answer
36 views

problem regarding hydrogen spectrum [closed]

The wavelength of the $\ce{H}_\alpha$ line of the Lyman series for the $\ce{H}$ atom is $\lambda$. What will be the transition for the $\ce{He+}$ ion which will have the same wavelength?" How do ...
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560 views

Really how rare are hydrogen atoms?

Hasok Chang, a chemist, but perhaps more a philosopher recently published the book Is Water H2O? . Chang used the question and an extensive web of arguments ultimately as a platform to support a ...
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1answer
148 views

How to make hydrogen peroxide into gel

How to make hydrogen peroxide into a gel or just simply really thick and it has to be able to be in your mouth? The only thing i have came up with is (Gelatins). What should i use?
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1answer
74 views

Equivalent hydrogens in 2,3-dimethylbutane

So while calculating for the relative yield of monochlorination for 2,3-dimethylbutane, I was counting the primary hydrogens, I counted 6, but in fact it was 12. Why is it 12? How do you find ...
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2answers
311 views

When does hydrogen bonding happen?

What kinds of molecules will experience hydrogen bonding (inter and intra)? Why does it occur for some H atoms but not others?
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2answers
51 views

Hydrogen Fuel Cell and Battery

For hydrogen fuel cell to produce electricity, hydrogen will need to be supplied to the anode. To split oxygen and hydrogen from water and obtain hydrogen, we need to use electrolysis. To use ...
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1answer
421 views

Why are so many wave functions associated with hydrogen?

According to Wikipedia, there's an infinite set of possible wavefunctions (orbitals) for the hydrogen atom: $$\psi_{n\ell m}(r,\theta,\phi) = \sqrt {{\left ( \frac{2}{n a_0} \right ...
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1answer
98 views

Are the energies of orbitals that are not filled in an atom, equal?

In a hydrogen atom only 1s orbital is filled. Does this mean that the energies of all other orbitals are equal? If so,why?
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HHO devices for cars (hydrogen enchancement of fuel burning reaction) [duplicate]

Recently I got quite an interesting offer for increasing my fuel economy (which for my 4.0 liter gasoline engine is quite bad as is) which was an HHO device. What it basically is, as I had it ...
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1answer
129 views

Why do carbon dioxide and sodium hydroxide not form sodium oxide and carbonic acid?

Why do carbon dioxide and sodium hydroxide not form sodium oxide and carbonic acid? $\ce{CO2 + 2NaOH -> Na2O + H2CO3}$ as opposed to: $\ce{CO2 + 2NaOH -> Na2CO3 + H2O}$ This is in the ...
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3answers
63 views

Producing low Density Gas in Room Temp?

Does anybody know two liquids or a solid and a liquid that can react to produce a gas less dense than air (or similar) in room temperature? This question is intended to make a chemical induced ...
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1answer
41 views

Calculating moles of Hydrogen gas in multiple gas container

If there was a 500 mL container filled with oxygen and hydrogen so it burns completely (2H:1O), how many moles of hydrogen gas would there be if there if pressure is 101.3 kPa and the temperature is ...
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1answer
217 views

On the stability of deuterium

The isotope of hydrogen, tritium, is indeed radioactive resulting in He 3 through beta decay. But what of the radioactively 'stable' isotope deuterium? Are all deuterium atoms destined to be ...
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1answer
294 views

Which orbitals of the hydrogen atom are degenerate for n=3?

Here's the link to the picture of the question. The answer says its E. All of them. First of all isn't there only 1 electron in hydrogen? And how could the s orbital be degenerate? Doesn't ...
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82 views

Structure of Metallic Hydrogen

I am simply curious what the theoretical arrangement of metallic hydrogen would be. I found this article which gives a picture, but I don't understand what the labels mean (e.g. is H5 an isotope, ...
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Hydrogen can be stored? [closed]

Please tell about the hydrogen gas storage and the pressure created in tank. what is the calorific value of hydrogen gas when it is burnt?
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770 views

Relationship between surface area of electrode and reaction rate of hydrogen in fuel cells

I am looking at the effects of increasing the surface area of which the flowing hydrogen fuel is in contact with the anode in a fuel cell. At the anode the hydrogen is catalytically split into ...
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2answers
264 views

alpha-hydrogen atom and keto-enol tautomerism

The following is an extract from my book- For an aldehyde or a ketone to exhibit keto-enol tautomerism, it is essential that it must have atleast one $\alpha$-hydrogen atom. Thus, acetophenone, ...
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1answer
74 views

If hydrogen bonding in water was weaker, what happens to H+ ion concentration?

Water ionization becomes much less evident if the hydrogen bonds are just a few percent stronger but pure water contains considerably more $\ce{H+}$ ions if they are few percent weaker. I found ...
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2answers
578 views

Ethane and ethene: which is easier to burn? Which one burns hotter? Why?

Anything that burns "easy", has a low activation energy for the burning process. Anything that burns hotter, will have a lesser enthalpy and thus, will have a more aggressive exothermic reaction. ...
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2answers
84 views

Same monomers, different water content?

We're currently studying "the chemistry of contact lenses", which is mostly polymers and gels. I just looked at the package of two pure hydrogel lenses made out of the same monomers, but they have ...
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1answer
116 views

Why is the electronegativity of hydrogen 2.20?

Well, I was doing research about the ways we can measure electronegativity and I just realized there must be an arbitrary electronegativity set for an specific element to give us the relative amounts ...
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48 views

Halogen bond definition

I was looking for an accurate definition of halogen bonding. I was able to find quite a few good ones, but none of them would explain if a X---H intermolecular interaction would count as a form of ...
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Why is hydrogen bonding generally defined to include only three period two elements?

Traditionally, hydrogen bonding has been defined only include interactions between a positively polarized hydrogen and three period two elements: nitrogen, oxygen, and fluorine. Why, however, was ...
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142 views

How is bonding in the trihydrogen cation and triatomic hydrogen possible?

According to wikipedia $\ce{H^+_3}$ and $\ce{H_3}$ are possible and have been synthesized. It says that $\ce{H^+_3}$ is stable too. Can anyone please tell me how is the bonding possible? Hydrogen ...
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1answer
1k views

Does hydrogen bonding only occur between water molecules?

Does hydrogen bonding only occur between water molecules? Is the dipole-dipole intermolecular interaction know as hydrogen bonding because it is between water molecules, or is called that because of ...
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131 views

Which atoms in a given amino acid are able to form hydrogen bonds with water?

Can anyone help me with this question I have tried everything. I know hydrogen bonding is with $\ce{F}$, $\ce{O}$, or $\ce{N}$, but every time I select those is says it's wrong.
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Preventing the gas when Hydrogen peroxide is added to a detergent

In organic detergents, when I add Hydrogen peroxide to increase the stain removing feature a gas is produced. How should I prevent the gas production process?
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2answers
162 views

Why is the ionization energy for Hydrogen non-zero?

There are no other electrons to collide, repel and kick Hydrogen's single electron to a distant nucleus. And that a single electron is tightly attracted to the nucleus by the electrostatic energy ...
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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 ...
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1answer
5k views

Why is the bond in HF ionic while it is covalent in HCl?

Why would a hydrogen atom "donate" to Fluorine in an ionic bond but not in $\ce{HCl}$? Why would $\ce{H}$ and Chlorine share instead of $\ce{Cl}$ just stripping it away like $\ce{F}$ does?
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319 views

In cracking, why does C form double bonds?

I've been reading about cracking and I've found various images and animations that show a process like this: But I haven't been able to find out the sequence of events to get to this, and why this ...
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1answer
136 views

Reduce chlorine gas

I have a simple electrolysis setup which uses aqueous sodium chloride as electrolyte. The problem is that, the setup makes tons of chlorine gas along with hydrogen (I only want hydrogen). I didn't ...
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2answers
2k views

Hydrogenation stereochemistry-Pd,Pt, Ni catalysts

When my textbook talks about hydrogenation using Pt, Pd or Ni heterogeneous catalysts, it never mentions if it is anti or syn addition. It simply jumps on to say that for alkynes, NiB2 (P-2) catalysts ...
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1answer
175 views

What are possible side reactions for the generation of hydrogen via electrolysis?

I recently completed making a simple water electrolysis setup to generate hydrogen which uses two graphite rods from a standard AA battery. The power source is a $24~\mathrm{V}$ $6~\mathrm{A}$ ...
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1answer
84 views

Reaction of distilled water with hard water

This question seems silly, but this just came in my mind while i was learning Hydrogen. Means will there be any reaction when $\ce{H2O}$will react with $\ce{D2O}$..
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1answer
63 views

How much water would one loose if one burns hydrogen and oxygen?

By using electrolysis one can separate hydrogen and oxygen, but when burning hydrogen and oxygen together steam is released, therefore creating water. My question is: how much of the original ...
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235 views

Hydrogen as a fuel really worth it?

Is hydrogen good to be used in cars? How much of traveling can a car do with medium sized balloon filled with hydrogen? Is it worth it?