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

learn more… | top users | synonyms

-1
votes
0answers
7 views

research for chemistry class

For my science (chemistry) class, I am researching about the topic 'hydrogen.' On the task specific rubrics, it is written that I have to write about The properties that hydrogen has, as an element, ...
0
votes
0answers
11 views

hydrogen (chemisty) [on hold]

b) The properties that hydrogen has, as an element is that c) The important technology in which hydrogen is being used is… 1) a) Extracting the element had a large impact on the environment ...
0
votes
0answers
13 views

decomposition of h2o2

According to the decomposition of 3% hydrogen peroxide, if 2cm^3 of h2o2 is used, then 3 x 10^-5 mol of 02 should be produced. However, we needed to find the theoretical yield so we conducted an ...
-1
votes
0answers
22 views

How much 300 g does equal to in mL? [on hold]

I have a hair shampoo which 300 g(Grams) in weight. I want to know how much does it equal to in ml(milliliters)? How do I do that?
1
vote
0answers
28 views

density of a hydrogen nuclei

I'm having trouble finding the density of the H nucleus, Since a Hydrogen nuclei has radius of 1.2e-10, and the nucleus is only composed of a single proton, thus the density would be (mass of a ...
0
votes
0answers
21 views

Why are hydrogenation reactions exothermic?

I learnt that all reactions that yield hydrogen are endothermic (such has reforming) and reactions, that use up hydrogen, are exothermic (FCC cracking, hydrogenation, etc.). But why is this so? I know ...
-1
votes
1answer
25 views

Water splitting ways [closed]

Do you know the frequency you can split hydrogen from the water bonds? I have doing at now but i need to absorb more than 3 liters gas hydrogen per minute. My device working only with one ampere by ...
0
votes
1answer
58 views

How many bonds can Hydrogen make?

Recently I saw a video which told me that Hydrogen has a valency of 1, i.e, Hydrogen can only bond with 1 other atom. But since hydrogen wants a complete shell, it can have 2 covalent bonds with 2 ...
4
votes
2answers
84 views

Why doesn't hydrogen displace metals from their oxides?

As I understand it, a displacement reaction is where a more reactive element kicks out a less reactive element from a compound. For example, chlorine is more reactive than iodine, so chlorine will ...
3
votes
1answer
47 views

Can gaseous hydrogen and gaseous oxygen be compressed without reaction?

I'm looking into building a clean Bunsen-style burner (or rocket engine - I haven't decided yet). I will be using electrolysis to extract hydrogen and oxygen from water, but the apparatus I am ...
3
votes
2answers
201 views

Why this doesn't hydrogen peroxide decompose into hydrogen and oxygen?

I'm trying to understand why hydrogen peroxide doesn't decompose into $\ce{H2}$ and $\ce{O2}$, but instead into $\ce{H2O}$ and $\ce{O2}$.
5
votes
1answer
438 views

Does the hydrogen ion actually exist?

A chemistry test I did was an IGCSE test. One of the questions was Is Hydrogen Chloride ionic or covalent? Now, on a sheet I have been given, it states the hydrogen ion is $\ce{H+}$. So, it ...
4
votes
1answer
72 views

Hydrogen's confusing purple glow

While reading about hydrogen on Wikipedia, I read that hydrogen has a purple glow in its plasma state. This confused me because although hydrogen is present in its plasma state on the sun, the sun ...
3
votes
0answers
60 views

Specific Heat Capacity of Heavy Water

Water has an unusually high specific heat capacity due to it's hydrogen bonds. Why is it that the change in isotope causes a 10% difference in the heat capacity? How does the added neutron in the ...
13
votes
0answers
421 views

Why can't Pd/C and H2 reduce both the alkene and carbonyl portions of α,β-unsaturated carbonyls?

Why is it that the major product of the reduction of chalcones the ketone and not the monoalcohol? In other words, Why isn't the major product a benzyl alcohol? From what I understand, catalytic ...
1
vote
2answers
30 views

What happen to the Salt in Water Electrolysis [closed]

I haven't found yet what happen to the Salt Ions in Water during Electrolysis and is there an Electron Flow or Ion Flow. I have expierienced strong magnetic Forces between the Electrodes but couldnt ...
9
votes
2answers
607 views

Why is there a need of polar coordinates to solve the Schrödinger wave equation for the hydrogen atom?

Why is there a need of polar coordinate to solve the Schrödinger wave equation for the hydrogen atom? I went through some standard text books but I am feeling rather confused about the explanation.
0
votes
1answer
54 views

Hydrogen displaces lead?

there was a reaction in my book. It is as follows: $\ce{PbO + H2-> Pb + H2O}$ My question is Hydrogen is below lead in the reactivity series. Then how is this reaction possible?
1
vote
1answer
119 views

Why is there no neutron in protium?

My chemistry teacher told me once that every atom should have at least as many neutrons as protons, to keep the electrons from crashing into the nucleus. Protium, however, does not have any neutrons ...
0
votes
0answers
18 views

Hydrogen phase transition

A sample of hydrogen at a pressure of 7.10×10-2 atm and a temperature of 26.4 K is compressed at constant temperature to a pressure of 18.5 Which of the following are true? 1. One or more phase ...
0
votes
0answers
35 views

Thermal conductivity of Ortho and Para hydrogen

I know that ortho form of hydrogen has more intrinsic energy than para and so is less stable than para, which is less energetic. Since para is more stable, it should have less thermal stability than ...
0
votes
1answer
152 views

Question on the stabilities of ortho- and para-hydrogen

I have 2 questions to ask. can the stability of ortho-hydrogen greater than para-hydrogen can be stated as this? The intrinsic energy of ortho is greater than para-hydrogen and also with rise ...
0
votes
0answers
59 views

H2 molecule dissociation with respect to temperature

$\ce{H2}$ dissociation is only 0.081% at around 2000K and 95.5% at around 5000K, why? Is it because $\ce{H2}$ has the strongest bond among the elements with 1 electron in valence shell, and ...
0
votes
1answer
27 views

Is there a non-violent, practical way of making hydrochloride with only Hydrogen and Chlorine?

A way of making HCl gas is to put Chlorine and Hydrogen into a test tube and expose it to UV light. This reaction is however fast and strong and I would like to store the Hydrochloride from it. ...
0
votes
0answers
24 views

Converting Hydrogen in to Methane

I am in need of small amount of pure methane for laboratory purpose. I have hydrogen generator in the lab. Is there a possibility of generating methane from hydrogen ? May be make hydrogen flow ...
0
votes
1answer
131 views

Calculate how much hydrogen or oxygen will be produced in the electrolysis of water

Is there a way to exactly calculate the quantity of hydrogen or oxygen in a water electrolysis? I am thinking of a plain and simple electrolysis like an anode and kathode in salted water separating ...
1
vote
1answer
49 views

Hydrogen visible transitions

When dealing with electrons and the electromagnetic spectrum, why are there only four visible transitions in the hydrogen atom?
0
votes
0answers
38 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 ...
25
votes
3answers
3k 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?
0
votes
1answer
45 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 ...
3
votes
1answer
85 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 ...
8
votes
2answers
136 views

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

I have some PDB structures of small molecules with missing hydrogens. Is there a software available that places missing hydrogens and assigns a charge to the molecule that is reliable? I am looking ...
14
votes
1answer
335 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. ...
4
votes
2answers
282 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
208 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
62 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
50 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.
-1
votes
1answer
50 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 ...
8
votes
2answers
659 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 ...
1
vote
1answer
243 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
2answers
489 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
60 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
490 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
106 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
18 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 ...
3
votes
3answers
84 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 ...
1
vote
1answer
276 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 ...
6
votes
1answer
357 views

On the stability of deuterium

The isotope of hydrogen, tritium, is indeed radioactive resulting in $\ce{^3He}$ through beta decay. But what of the radioactively 'stable' isotope deuterium? Are all deuterium atoms destined to be ...
6
votes
2answers
2k 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
115 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, ...