Its not a chemical reaction.
It is the fusion of four protons (basically hydrogen nuclei) into one alpha particle (a helium nucleus), with the release of two positrons, two neutrinos (which changes two of the initial protons into neutrons), and energy.
2007-10-11 16:00:11
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answer #1
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answered by Anonymous
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The H and O aren't directly from the H2O, Chloroplasts also use glucose (C6H12O6). Electrons from glucose in the membrane of the thylakoid (part of a Chloroplast) are heated up by the sun. The electrons then leave that part of the membrane being picked up by a series of acceptors in the membrane the last step is to release the electrons which creates energy for the cell. The glucose and water are re-arranged so the H and O aren't both from the same molecule.
2016-05-21 23:30:32
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answer #2
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answered by ? 3
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The Sun does not use any chemical reaction so there is no chemical equation describing what it does.
It uses a nuclear reaction, just like aviophage said. The specific reaction is called the proton-proton chain reaction. It is too long and complicated to paste in here, so see the source. Just like Vicente said. Thumbs up for him.
2007-10-11 12:05:28
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answer #3
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answered by campbelp2002 7
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The sun is a thermonuclear reaction, rather than a chemical reaction. Essentially, the sun produces energy when hydrogen atoms are forced together with so much force that they fuse into larger atoms. As a natural property of such a collision, they release energy when they combine. It is the same process that makes a hydrogen bomb explode.
2007-10-11 11:53:26
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answer #4
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answered by aviophage 7
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There isn't any because thre sun's energy is not produced by any chemical reaction(s). It is produced by nuclear reactions. Chemical reaction don't involve the nucleus of atoms. They involve the electrons outside of the nucleus.
2007-10-11 12:20:55
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answer #5
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answered by Renaissance Man 5
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i have categorized the answer into two :
first(simple answer) ;
4 hydrogen atoms combines to form 1 helium atom,plus energy is released
second(the complicated answer) ;
The first step involves the fusion of two hydrogen nuclei 1H (protons) into deuterium 2H, releasing a positron and a neutrino as one proton changes into a neutron.
1H + 1H → 2H + e+ + νe
with the neutrinos released in this step carrying energies up to 0.42 MeV.
This first step is extremely slow, because it depends on an endoergic beta positive decay, which requires energy to be absorbed, to convert one proton into a neutron. In fact this is the limiting step, with a proton waiting an average of 109 years before fusing into deuterium[citation needed].
The positron immediately annihilates with an electron, and their mass energy is carried off by two gamma ray photons.
e+ + e− → 2γ + 1.02 MeV
After this, the deuterium produced in the first stage can fuse with another hydrogen to produce a light isotope of helium, 3He:
2H + 1H → 3He + γ + 5.49 MeV
From here there are three possible paths to generate helium isotope 4He. In pp1 helium-4 comes from fusing two of the helium-3 nuclei produced; the pp2 and pp3 branches fuse 3He with a pre-existing 4He to make Beryllium. In the Sun, branch pp1 takes place with a frequency of 86%, pp2 with 14% and pp3 with 0.11%. There is also an extremely rare pp4 branch.
The pp I branch
3He +3He → 4He + 1H + 1H + 12.86 MeV
The complete pp I chain reaction releases a net energy of 26.7 MeV. The pp I branch is dominant at temperatures of 10 to 14 megakelvins (MK). Below 10 MK, the PP chain does not produce much 4He.
The pp II branch
3He + 4He → 7Be + γ
7Be + e− → 7Li + νe
7Li + 1H → 4He + 4He
The pp II branch is dominant at temperatures of 14 to 23 MK.
90% of the neutrinos produced in the reaction 7Be(e−,νe)7Li* carry an energy of 0.861 MeV, while the remaining 10% carry 0.383 MeV (depending on whether lithium-7 is in the ground state or an excited state, respectively).
The pp III branch
3He + 4He → 7Be + γ
7Be + 1H → 8B + γ
8B → 8Be + e+ + νe
8Be ↔ 4He + 4He
The pp III chain is dominant if the temperature exceeds 23 MK.
The pp III chain is not a major source of energy in the Sun (only 0.11%), but was very important in the solar neutrino problem because it generates very high energy neutrinos (up to 14.06 MeV).
The pp IV or Hep
This reaction is predicted but has never been observed due to its great rarity (about 0.3 parts per million in the Sun). In this reaction, Helium-3 reacts directly with a proton to give helium-4, with an even higher possible neutrino energy (up to 18.8 MeV).
3He + 1H → 4He + νe + e+
Energy release
Comparing the mass of the final helium-4 atom with the masses of the four protons reveals that 0.007 or 0.7% of the mass of the original protons has been lost. This mass has been converted into energy, in the form of gamma rays and neutrinos released during each of the individual reactions. The total energy we get in one whole chain is 26.73 MeV.
Only energy released as gamma rays will interact with electrons and protons and heat the interior of the Sun. This heating supports the Sun and prevents it from collapsing under its own weight.
Neutrinos do not interact significantly with matter and do not help support the Sun against gravitational collapse. The neutrinos in the ppI, ppII and ppIII chains carry away the 2.0%, 4.0% and 28.3% of the energy respectively.[1]
Deuterium can also be produced by the rare pep (proton-electron-proton) reaction (electron capture):
1H + e− + 1H → 2H + νe
In the Sun, the frequency ratio of the pep reaction versus the pp reaction is 1:400. However, the neutrinos released by the pep reaction are far more energetic: while neutrinos produced in the first step of the pp reaction range in energy up to 0.42 MeV, the pep reaction produces sharp-energy-line neutrinos of 1.44 MeV.
Both the pep and pp reactions can be seen as two different Feynman representations of the same basic interaction, where the electron passes to the right side of the reaction as an anti-electron. This is represented in the figure of proton-proton and electron-capture chain reactions in a star, available at the NDM'06 web site
so, do u understand it now. god bless u.
2007-10-11 23:22:38
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answer #6
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answered by Krrish 1
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Most of the energy comes from the P P Chain.
It's complicated..
campbelp2002 is right, not a chemical reaction.
Thumbs up for him!
2007-10-11 11:51:32
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answer #7
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answered by Vicente 6
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This gives the formula for fusion, similar to what happens in the sun:
http://en.wikipedia.org/wiki/Fusion_power
2007-10-11 13:57:01
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answer #8
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answered by Howard H 7
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the sun's energy comes from the sun.
2007-10-11 11:47:01
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answer #9
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answered by Sam 6
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