The energy produced by a nuclear reaction comes from..?

Question

a. the movement of electrons
b. the "disappearance" of a small amount of mass.
c. the "creation" of a small amount of mass.
d. the breaking of bonds.

Answer 1

This has nothing to do with molecules, a nuclear reaction concerns only atoms and therefor this has nothing to do with bonds or electrons.

A nuclear reaction( in this case fission) has to do with modification of the nucleus. In fission the nucleus of an atom is being split, its nucleus is breaking into two releasing a ton of energy. This energy is the result of a small amount of the nucleus's mass being converted into energy.

The energy produced can be calculated with the famous E=mc^2, where 'E' is the energy produced and 'm' is the amount of mass lost, the 'c' stands for 'celeritas'( quickness in Latin), which is a term describing the speed of light, 299, 792, 458 m/s. From the magnitude of c it is easy to see why so much energy is created.

Therefor the answer is 'b'. The 'disappearance' is the conversion of mass to energy.

Answer 2

D. The Breaking of bonds.

Nuclear Fission: In nuclear fission, the nuclei of atoms are split, causing energy to be released. The atomic bomb and nuclear reactors work by fission. The element uranium is the main fuel used to undergo nuclear fission to produce energy since it has many favorable properties. Uranium nuclei can be easily split by shooting neutrons at them. Also, once a uranium nucleus is split, multiple neutrons are released which are used to split other uranium nuclei. This phenomenon is known as a chain reaction.

Nuclear Fusion: In nuclear fusion, the nuclei of atoms are joined together, or fused. This happens only under very hot conditions. The Sun, like all other stars, creates heat and light through nuclear fusion. In the Sun, hydrogen nuclei fuse to make helium. The hydrogen bomb, humanity's most powerful and destructive weapon, also works by fusion. The heat required to start the fusion reaction is so great that an atomic bomb is used to provide it. Hydrogen nuclei fuse to form helium and in the process release huge amounts of energy thus producing a huge explosion.
This has nothing to do with molecules, a nuclear reaction concerns only atoms and therefor this has nothing to do with bonds or electrons.

A nuclear reaction( in this case fission) has to do with modification of the nucleus. In fission the nucleus of an atom is being split, its nucleus is breaking into two releasing a ton of energy. This energy is the result of a small amount of the nucleus's mass being converted into energy.

The energy produced can be calculated with the famous E=mc^2, where 'E' is the energy produced and 'm' is the amount of mass lost, the 'c' stands for 'celeritas'( quickness in Latin), which is a term describing the speed of light, 299, 792, 458 m/s. From the magnitude of c it is easy to see why so much energy is created.

Therefor the answer is 'b'. The 'disappearance' is the conversion of mass to energy.

Answer 3

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There may still be a tiny portion still produced by gravitational contraction and/or loss of gravitational potential as denser elements sink towards the core, but after 5 billion year and will all the convection going on, I would expect that this is an extremely small fraction that can be safely ignored in the type of calculations we do on Yahoo!Answers. Still, the value is not completely zero as there is still "stuff" falling onto the Sun (we can certainly see the occasional comet, and there must be the occasional asteroid). There may also be an almost-as-tiny fraction being produced by tidal braking (mostly due to Jupiter and Saturn). Again, other than the mathematical curiosity, this can be ignored.

Answer 4

The answer is B.

The answers could be worded better... the reason some people are answering D is because the bonds between particals in the core of atomic nuclei is the source of the disappearance of mass. However, It is obvious to me that whoever wrote this question is talking about bonds between atoms (normal chemical non-nuclear reactions) and therefore answer D should be avoided. Answer B should probably read "conversion" of mass instead of "Disappearance" of mass. I suspect this is just a general education question written poorly, instead of a class in nuclear physics.

Remember: matter and energy never "disappear", they are converted from one to the other... never created, never destroyed.

Good luck

Answer 5

D. The Breaking of bonds.

Nuclear Fission: In nuclear fission, the nuclei of atoms are split, causing energy to be released. The atomic bomb and nuclear reactors work by fission. The element uranium is the main fuel used to undergo nuclear fission to produce energy since it has many favorable properties. Uranium nuclei can be easily split by shooting neutrons at them. Also, once a uranium nucleus is split, multiple neutrons are released which are used to split other uranium nuclei. This phenomenon is known as a chain reaction.

Nuclear Fusion: In nuclear fusion, the nuclei of atoms are joined together, or fused. This happens only under very hot conditions. The Sun, like all other stars, creates heat and light through nuclear fusion. In the Sun, hydrogen nuclei fuse to make helium. The hydrogen bomb, humanity's most powerful and destructive weapon, also works by fusion. The heat required to start the fusion reaction is so great that an atomic bomb is used to provide it. Hydrogen nuclei fuse to form helium and in the process release huge amounts of energy thus producing a huge explosion.

Answer 6

B ) the disparition of small amounts of mass according to E=mc^2

Answer 7

I may be outnumbered, but I say:
b. the "disappearance" of a small amount of mass.

EDIT: "b"s are in the majority now!

Answer 8

D, but only in the case of nuclear fission.

The other type of nuclear reaction is nuclear fusion, but they havent figured out how to make it work yet.

Answer 9

E=mc^2

a small amount of matter is changed into energy. answer b