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Uranium
Uranium is a heavy element with the atomic number 92 and the symbol U. In 1789 it was discovered in the mineral pitchblende by Martin Heinrich Klaproth , who named it after the planet Uranus
586 Questions
What is the density of Uranium hexafluoride at stp?
The chemical formula of uranium hexafluoride is UF6.
Why is there uranium in concrete?
Uranium is a naturally occurring metal, and, as such, is often found in the Earth's crust, although quantities have diminished considerably since the Earth's formation. Concrete, comprising primarily of rocks mined from the Earth's crust, will occasionally contain a sample of uranium therefore. Also, other heavy atoms may be forced to take on a few additional protons in very rare circumstances, often owing to the immense heat and pressure involved in the creation of limestone and other such rocks. Consequently, uranium occasionally can be found in concrete.
What is the physical state of Uranium?
Uranium is a natural chemical element, metal, solid.
The atomic number is 92 and the atomic weight is 238,02891(3).
Most abundant isotope of uranium is?
More than 99%of naturally occurring uranium is U-238. The valuable U-235 makes up less than 1% of uranium, and must be "enriched" in complicated processes.
How much of the US use of uranium?
Used for what?
- light water moderated reactors typically use 3% U-235 enriched uranium
- heavy water moderated reactors can use 0.72% U-235 natural uranium
- graphite moderated reactors use from 0.72% U-235 natural uranium to 93.5% U-235 enriched uranium depending on the exact reactor design
- fast (unmoderated) reactors (some research reactors and breeder reactors) need at least 20% U-235 enriched uranium, with 93.5% U-235 enriched uranium being most common
- nuclear uranium fission bombs need at least 20% U-235 enriched uranium, with 93.5% U-235 enriched uranium being most common (the WW2 Littleboy bomb used 80% U-235 enriched uranium)
- nuclear plutonium fission bombs use plutonium, not uranium
- both uranium and plutonium fission bombs use a 0.2% to 0.71% depleted uranium tamper
- many nuclear fusion bombs use an outer casing made of either 0.2% to 0.71% depleted uranium or 0.72% U-235 natural uranium to increase yield by up to a factor of 10
- some armor penetrating bullets use 0.2% U-235 depleted uranium
- some tank armor uses 0.2% U-235 depleted uranium
- civilian uses such as: radiation shielding, pigments/dyes, aircraft trim weights, industrial products, racing sailboat keels, etc. use either 0.2% to 0.71% depleted uranium or 0.72% U-235 natural uranium
- etc.
Or perhaps you actually meant used up. Again used up in what? In reactors the percentage of U-235 used up before the fuel rods are replaced is called burnup; while in fission bombs the percentage of U-235 or Pu-239 used up before the bomb blows itself apart (self dissembles) stopping fission is called efficiency.
- plutonium production reactors cycle fuel through the core very rapidly to produce as pure Pu-239 as possible without undesired heavier isotopes have very low burnup of well under 1% of the U-235 in the fuel
- power reactors typically have burnup of about 25% of the U-235 in the fuel although a few designs can achieve 50% burnup
- nuclear uranium fission gun bombs like the WW2 Littleboy bomb typically have an efficiency of 1% to 2% of the U-235 in the fuel
- nuclear uranium fission implosion bombs have an efficiency of 10% to 37% of the U-235 in the fuel depending on design (the 1952 Ivy King half megaton test shot was the highest yield & highest efficiency pure fission bomb ever built at 37% efficient)
- boosted nuclear uranium fission implosion bombs can probably double to triple their efficiency so they probably have an efficiency of 30% to 80% of the U-235 in the fuel depending on design; note all boosted fission bomb designs that I am aware of used plutonium, not uranium
- etc.
Why is uranium a non- renewable fuel?
Uranium is considered a non-renewable fuel because it is a finite resource that is extracted from the earth's crust. Once uranium is mined and used in nuclear reactors, it cannot be replenished at a rate that matches its consumption. This makes it unsustainable in the long term for energy production.
Uranium can be conserved by reducing its usage in nuclear reactors through improved efficiency, recycling spent fuel, and developing alternative energy sources. Additionally, regulating the mining and extraction of uranium and promoting awareness about the importance of conserving this non-renewable resource can help in its conservation.
What two elements are produced when an atom of uranium 235 is split?
The results are not always the same, what is actually produced varies from one nucleus to another, so the result can only be represented statistically. There is one peak at around atomic mass of 100 and another at around 135. See the link below for a graph and more details
The price of uranium can vary depending on factors such as market demand, supply levels, and geopolitical events. In recent years, the price of uranium has been relatively low due to oversupply in the market and decreased demand for nuclear energy. However, prices can fluctuate based on various economic and political circumstances.
What uses are there for uranium?
Applications of uranium:
- nuclear fuel for nuclear power reactors
- explosive for nuclear weapons
- material for armors and projectiles
- catalyst
- additive for glass and ceramics (to obtain beautiful green or yellow colors)
- toner in photography
- mordant for textiles
- additive for the preparation of biological samples for electron microscopy
- shielding material (depleted uranium)
- ballast (counter weights)
- and other minor applications
What is the half-life of uranium 238?
Alpha disintegration: (4,470 ± 0,020) 109 years Spontaneous fission: (8,20 ± 0,10) 1015 years
What is uraniums malleability?
Uranium is a brittle metal and not known for its malleability. It tends to fracture rather than deform under pressure.
What is the diameter of a uranium 234 nucleus?
The diameter of a uranium-234 nucleus is approximately 15 femtometers (1.5 x 10^-14 meters). This size is based on theoretical models and experimental data on the nuclear size of various isotopes. Uranium-234 is a heavy nucleus with a relatively large size compared to lighter elements.
Applications of uranium:
- nuclear fuel for nuclear power reactors
- explosive for nuclear weapons
- material for armors and projectiles
- catalyst
- additive for glasses and ceramics (to obtain beautiful green colors)
- toner in photography
- mordant for textiles
- shielding material (depleted uranium)
- ballast
- and other minor applications
The price on the spot in June 2011 is approx. 120 US $/kg of the oxide U3O8, nonrefined.
What chemical family is uranium in?
the pereodic table of elements.
rare earth.
other things in that section:
lanthanium,cerium,praseodymium,neodium,promethium,samarium,
europium,gadolinium,terbium,dysprosium,holmium,erbium,thulium,
ytterbium,luttium,actinium,thorium,proacttinium,uranium,neptunium
,plutonium,americium,curium,berkelium,californium,einsteinium,fermium,
mendelevium,nobelium,lawrencium.
What energy does uranium give?
Uranium provides nuclear energy through a process called nuclear fission. When uranium atoms split, they release a large amount of heat energy, which is used to generate electricity in nuclear power plants. This process is highly efficient and produces low greenhouse gas emissions compared to fossil fuels.
No, uranium does not rust like iron does. Rusting is a chemical reaction that occurs with iron when exposed to oxygen and moisture, forming iron oxide. Uranium is a metallic element and does not undergo the same type of chemical reaction as iron to form rust.
What is the most common isotope of uranium?
The most common isotope of zinc is the one with mass number 64; the atomic number of zinc is 30, which means each zinc nucleus contains 30 protons, and the mass number is defined as the sum of the numbers of neutrons and protons. Therefore, the number of neutrons is (64 - 30) or 34.
How do you change uranium to uranium oxide?
Oxidize it. Burning is really easy. Acids (even water) will work too. Solving of uranium in nitric acid, dilution with water, precipitation with ammonia (or other chemicals), first calcination to ammonium diuranate - (NH4)2U2O7, second calcination in air to oxide U3O8, reduction to oxide UO2 with hydrogen.
What is Uranium energy used for?
Uranium energy is primarily used as fuel in nuclear power plants to generate electricity. It undergoes nuclear fission, in which the uranium nucleus splits into smaller parts, releasing a large amount of energy. Uranium can also be used in nuclear weapons due to its ability to undergo fission reactions.
Where did martin klaproth discover uranium?
In pitchblende from Joachimow (now in Czech Republic), 1789
What does Uranium do to your skin?
The effect of uranium on skin depends from: chemical form (fluoride, metal, nitrate, etc.), physical form (solid, liquid-solution, gas), quantity, time of contact, particles dimensions, etc. Uranium metal (natural isotopic composition) in bulk form is not so dangerous.
Enriched uranium is uranium that has had its U-235 isotope content elevated above what it would be when we refine natural uranium after recovering the metal from ore.
We know that U-235 is the desired fissionable isotope of uranium, but it is the isotope U-238 that is present in over 99% of all the naturally occurring uranium we mine and recover. We have to put the uranium through a process to separate the U-235 from the U-238. As these two isotopes are chemically identical, it takes a mechanical process to separate them. After running the uranium through a process designed to take advantage of the difference in the mass of the two atoms, the industry will recover uranium with a very high percentage of the U-235 isotope, and this is called enriched uranium.
If uranium is enriched to a point where there is up to about 20% U-235, it is low-enriched uranium. Above that 20% mark we see highly enriched uranium. Above about 85%, we call the product weapons-grade uranium. A link can be found below for more information.
