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Subject:
science
Category: Science Asked by: lala37-ga List Price: $2.00 |
Posted:
18 Apr 2005 08:47 PDT
Expires: 18 May 2005 08:47 PDT Question ID: 510819 |
write out the complete alpha decay for uranium 235 |
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There is no answer at this time. |
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Subject:
Re: science
From: pforcelli-ga on 18 Apr 2005 11:11 PDT |
Golly, this sounds like a homework problem... |
Subject:
Re: science
From: hfshaw-ga on 18 Apr 2005 15:25 PDT |
Do a Google search for "uranium decay series". The answer you seek can be found in many places on the web, e.g., <http://www.ead.anl.gov/pub/doc/NaturalDecaySeries.pdf>. |
Subject:
Re: science
From: engr_ucr-ga on 22 Apr 2005 16:00 PDT |
Well, by either searching on google or reading your textbook, you will realize what a alpha particle and a beta particle look like. Alpha particle is a Helium with 2 protons and 2 neutrons (atomic mass = protons + neutrons = 2+2 =4). Now that we have established what an alpha particle look like, we need to understand what is alpha decay. Alpha decay simply means when a certain element undergoes this decay, it releases an alpha particle. So when you have a certain element (for your case, U235), when it undergoes alpha decay, it releases an alpha particle, and becomes a more stable compound. To figure out the answer to your problem, all you have to think about is since it EMITS an alpha particle, then you have to subtract a Helium with 2 protons and 2 neutrons from the element, then whatever it forms will be your answer. Similar thing applies for beta decay, however, with beta decay, you can have a beta-plus decay or a beta-minus decay. With a beta-minus decay, it releases a nutrino and a negatively charged electron (what's the change in atomic mass here?). A beta-plus decay, the element releases a neutrino and a positive electron called positron (sounds weird, but that's how it is). Using the above information, you should be able to solve your problem. you can find all these information through the internet easily, you should definitely try to solve your next problem by utilizing all resources such as the internet (make sure your answer comes from a valid source though), the library, your textbook, etc. Good luck with your assignment! |
Subject:
Re: science
From: itsekurity-ga on 28 Apr 2005 01:28 PDT |
Uranium was discovered by Martin Heinrich Klaproth, a German chemist, in the mineral pitchblende (primarily a mix of uranium oxides) in 1789. Although Klaproth, as well as the rest of the scientific community, believed that the substance he extracted from pitchblende was pure uranium, it was actually uranium dioxide (UO2). After noticing that 'pure' uranium reacted oddly with uranium tetrachloride (UCl4), Eugène-Melchoir Péligot, a French chemist isolated pure uranium by heating uranium dioxide with potassium in a platinum crucible. Radioactivity was first discovered in 1896 when Antoine Henri Becquerel, a French physicist, detected it from a sample of uranium. Today, uranium is obtained from uranium ores such as pitchblende, uraninite (UO2), carnotite (K2(UO2)2VO4·1-3H2O) and autunite (Ca(UO2)2(PO4)2·10H2O) as well as from phosphate rock (Ca3(PO4)2), lignite (brown coal) and monazite sand ((Ce, La, Th, Nd, Y)PO4). Since there is little demand for uranium metal, uranium is usually sold in the form of sodium diuranate (Na2U2O7·6H2O), also known as yellow cake, or triuranium octoxide (U3O8). Since it is naturally radioactive, uranium, usually in the form of uranium dioxide (UO2), is most commonly used in the nuclear power industry to generate electricity. Naturally occurring uranium consists of three isotopes: uranium-234, uranium-235 and uranium-238. Although all three isotopes are radioactive, only uranium-235 is a fissionable material that can be used for nuclear power. When a fissionable material is struck by a neutron, its nucleus can release energy by splitting into smaller fragments. If some of the fragments are other neutrons, they can strike other atoms and cause them to split as well. A fissionable material, such as uranium-235, is a material capable of producing enough free neutrons to sustain a nuclear chain reaction. Only 0.7204% of naturally occurring uranium is uranium-235. This is too low a concentration to sustain a nuclear chain reaction without the help of a material known as a moderator. A moderator is a material that can slow down a neutron without absorbing it. Slow neutrons are more likely to react with uranium-235 and reactors using natural uranium can be made using graphite or heavy water as a moderator. Methods also exist for concentrating uranium-235. Once the levels of uranium-235 have been increased to about 3%, normal water can be used as a moderator. its all here: http://education.jlab.org/itselemental/ele092.html |
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