Mary asks…
What volume of hydrogen gas will be produced under these conditions?
1.00g Manganese reacts with an excess of 6.00 M HCl, how many grams of hydrogen gas are produced? The density of hydrogen gas is 0.08988 g/L at 0 degrees celcius and 1 atm pressure. What volume of hydrogen is produced by the reaction, under these conditions?
admin answers:
_____Guess you didn’t like the wikipedia answer to what is produced in the reaction as you gave me 1 star for my previous answer for giving Mn+2 as the oxidation state of Mn product.
Mn + 2 HCl ? MnCl2 + H2
en.wikipedia.org/wiki/Manganese(II)_chloride
Maybe you’ll tell the answerers why Mn+3 is formed.
Carol asks…
How do I calculate the densities of a hydrogen nucleus and a hydrogen atom?
Using the mass of the proton (1.67e-27 kg), the mass of the electron (9.11e-31 kg), and the sizes of the nucleus and the atom, calculate the densities of a hydrogen nucleus and a hydrogen atom. (Radius of hydrogen atom is 1e8 cm and I thnk the diameter of the nucleus is 1e-13 cm)
density of hydrogen nucleus
? g/cm3
density of hydrogen atom
? g/cm3
There is another question just like this already on answers but when I tried it out it did not work.
admin answers:
You will very well understand with the following paragraph. (Source at the bottom.)
“The nucleus occupies only a tiny fraction of the volume of an atom (the radius of the nucleus being some 10,000 to 100,000 times smaller than the radius of the atom as a whole), but it contains almost all the mass. An idea of the extreme density of the nucleus is revealed by a simple calculation. The radius of the nucleus of hydrogen is on the order of 10-13 cm so that its volume is on the order of 10-39 cm3 (cubic centimeter); its mass is about 10-24 g (gram). Combining these to estimate the density, we have 10-24 g/10-39 cm3 approximately 1015 g/cm3, or about a thousand trillion times the density of matter at ordinary scales (the density of water is 1 g/cm3).”
Now, if I try with what you provided as numbers, I get the following:
The nucleus is made of one proton, so it weights
1.67*10^-27 kg or 1.67*10^-24 g
Diameter of the nucleus : 1*10^-13 cm
Radius : 5*10^-14 cm or 5*10^-16 m
Volume of a sphere : 4/3*pi*r³
Volume of the H nucleus : 4/3 * pi * (5*10^-16 m)³ = 5.236*10^-46 m³
Then you have a density (in SI units) of
1.67*10^-27 kg / 5.236*10^-46 m³ = 3.189*10^18 kg/m³
using google : convert 3.189*10^18 kg/m^3 to g/cm^3
I get 3.189*10^15 g/cm³
That’s not exactly what they say on the site, but I also didn’t use the same numbers.
Same idea for the whole atom.
Hope this helps!
Donald asks…
How do the hydrogen bonds between water molecules compare to the covalent bonds within water molecules?
How do the hydrogen bonds between water molecules compare to the covalent bonds within water molecules?
Hydrogen bonds are between two hydrogen atoms. Covalent bonds are between a hydrogen and an oxygen.
The hydrogen bonds are more easily broken than the covalent bonds.
The hydrogen and covalent bonds are both polar.
The hydrogen and covalent bonds both involve electron sharing.
admin answers:
Hydrogen bonds are between one hydrogen atom which is delta + with a oxygen’s lone pair on another water molecule which is delta – Don’t get too confused here, I’m basically saying one is more electronegative than the other. Covalent bonds share electrons between the H2 and O2 atoms thus are much stronger than hydrogen bonds, which are much weaker intermolecularar forces.
When you heat water you are actually breaking the H-bonds BETWEEN the molcules, it is extremly difficult to break the stronger covalent bonds within the atoms however.
Laura asks…
Can the Hydrogen created while charging a lead acid battery be fed to a combustion engine?
In a Diesel engine LPG is added to boost proformance. Could Hydrogen go the same, without expensive equipment? A Hybrid with lead acid batteries would produce more Hydrogen, maybe enough to make a difference.
admin answers:
In principle, yes. You would be recovering some of the energy used to charge the battery. In practical terms, no. The amount would be insignificant, and the instalation required would make it prohibitive.
.
Joseph asks…
Can the Hydrogen created while charging a lead acid battery be feed to a combustion engine?
In a Diesel engine LPG is added to boost proformance. Could Hydrogen go the same, without expensive equipment? A Hybrid with lead acid batteries would produce more Hydrogen, maybe enough to make a difference.
admin answers:
There is not enough hydrogen coming out (and the pressure is low) so it would not serve that purpose.
Daniel asks…
What is the difference between hydrogen atoms and hydrogen gas?
I have a science project on the building blocks of matter and i need help with the question: What is the difference between hydrogen atoms and hydrogen gas?
admin answers:
The biggest difference is that elemental Hydrogen, that is, unpaired Hydrogen is not possible to have “in the free world.” That is because Hydrogen is a diatomic element, like Oxygen, and readily combines with another Hydrogen to create Dihydrogen, more commonly referred to as Hydrogen gas, or H2(g).
The mass of one H atom is 1.01 amu, theoretically isolating one Hydrogen atom IS possible, but for all intents and purposes, you will only find Hydrogen gas as H2.
Linda asks…
What is it about the hydrogen atom that allowed it to produce photons of this type?
It was determined that not all of the lines in the hydrogen spectrum were visible. There were some discovered in the ultraviolet range
A. Hydrogen has an invisible area from which photons outside the visible range originate.
B. Only the hydrogen atoms from the sun emit ultraviolet rays.
C. Ultraviolet photons have a longer wavelength, thus more energy.
D. Higher energy photons come from transitions between energy levels of greater difference in energy.
E. This is known as the ultraviolet catastrophe and never really took place.
admin answers:
D. Is the only one that seems to make _any_sense to me, but it doesn’t specifically say why this would be the case for hydrogen, still the other options are worse, so D is my final answer.
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