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

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7
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2answers
84 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 ...
13
votes
1answer
274 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. ...
3
votes
1answer
44 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 ...
7
votes
1answer
55 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 ...
4
votes
1answer
48 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 ...
1
vote
1answer
24 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.
0
votes
1answer
32 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 ...
7
votes
1answer
536 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 ...
2
votes
1answer
37 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?
1
vote
1answer
58 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 ...
4
votes
3answers
222 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?
2
votes
2answers
41 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 ...
5
votes
1answer
382 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 ...
3
votes
1answer
92 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?
1
vote
0answers
15 views

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 ...
1
vote
1answer
87 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 ...
3
votes
3answers
60 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 ...
0
votes
1answer
34 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 ...
4
votes
1answer
192 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 ...
4
votes
1answer
144 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 ...
5
votes
1answer
66 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, ...
-2
votes
1answer
55 views

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?
6
votes
1answer
561 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 ...
3
votes
2answers
191 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, ...
1
vote
1answer
66 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 ...
0
votes
2answers
475 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. ...
2
votes
2answers
71 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 ...
5
votes
1answer
97 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 ...
4
votes
1answer
45 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 ...
5
votes
2answers
166 views

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 ...
5
votes
2answers
129 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 ...
2
votes
1answer
959 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 ...
1
vote
1answer
116 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.
0
votes
1answer
41 views

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?
2
votes
2answers
140 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 ...
18
votes
5answers
9k views

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 ...
2
votes
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?
8
votes
1answer
244 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 ...
4
votes
1answer
135 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 ...
2
votes
2answers
1k 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 ...
1
vote
1answer
136 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 $24~\mathrm{V}$ $6~\mathrm{A}$ ...
3
votes
1answer
69 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 $\ce{D2O}$..
1
vote
1answer
58 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 ...
2
votes
3answers
228 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?
6
votes
1answer
145 views

Reaction mechanism of combustion of H2?

After a discussion about the usefulness of hydrogen fuel for cars with a friend of mine, I wondered what the reaction mechanism for combustion of $\ce{H}_2$ was. I only study (well almost) organic ...
2
votes
1answer
153 views

Can electrolyzing ice cause an explosion?

I know electrolyzing water separates it into hydrogen and oxygen. However, I am curious, if ice is electrolyzed, could it explode? My thought process is that oxygen and hydrogen bubbles would build ...
2
votes
1answer
54 views

Hydrogen atom energy level [closed]

The energy level of a hydrogen atom in its ground state is $-13.6\ \mathrm{eV}$. How is this value calculated and how can we calculate the same for different orbits?
3
votes
2answers
62 views

What's the Acid Ionization Constant of the Hydrogen Proton?

What is the $\ce{K_{a}}$ value for $\ce{H^+}$. I understand that the hydrogen proton doesn't stick around in solution by itself for very long. Nonetheless, does it have a $\ce{K_{a}}$ value? Can it ...
2
votes
1answer
215 views

Why does the Schroedinger equation for hydrogen atom look like this?

Here is how I saw the Hamiltonian being written in one Quantum Mechanics book: Well, That's all very nice and complicated, but looking at the last term, and seeing the use of $r$ in there, ...
3
votes
2answers
138 views

Hydrogen suspended in the center of an aromatic ring and NMR

My textbook (Organic Chemistry, 2nd Ed. Hornback, Joseph) states that if a hydrogen is located near the center of an aromatic ring it will experience an (often quite sizable) upfield shift, as seen in ...