NounSingular urea Plural uncountable urea (uncountable)
SynonymsDerived termsFrom Wiktionary under the GNU Free Documentation License. Urea or carbamide is an organic compound with the chemical formula (N H2)2C O. The molecule has two amine (-NH2) groups joined by a carbonyl (C=O) functional group. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals. It is solid, colourless, and odorless (although the ammonia which it gives off in the presence of water, including water vapor in the air, has a strong odor). It is highly soluble in water and non-toxic. Dissolved in water it is neither acidic nor alkaline. The body uses it in many processes, most notably in the kidneys as a concentrated salt. Urea is widely used in fertilizers as a convenient source of nitrogen. Urea is also an important raw material for the chemical industry. The synthesis of this organic compound by Friedrich Wöhler in 1828 from an inorganic precursor was an important milestone in the development of organic chemistry, as it showed for the first time that a molecule found in living organisms could be synthesized in the lab without biological starting materials. The terms urea and carbamide are also used for a class of chemical compounds sharing the same functional group RR'N-CO-NRR', namely a carbonyl group attached to two organic amine residues. Example include carbamide peroxide, allantoin, and hydantoin. Ureas are closely related to biurets and related in structure to amides, carbamates, diimides, carbodiimides, and thiocarbamides. From Wikipedia under the
GNU Free Documentation License How to separate melamine and urea which both in liquids phase? Q. what kinds of separation units should i used to separate the melamine and unreacted urea? the product that wanted is melamine. thanks for everyone that help me solve. Asked by cyin_86 - Fri Aug 22 03:43:04 2008 - - 1 Answers - 0 Comments A. You might try to re-post this in the Chemistry category, since no one in the Engineering category seems to know the answer (me included). . . Answered by tlbs101 - Mon Aug 25 13:21:07 2008 How does the addition of Urea affect an enzyme-controlled reaction? Q. Urea breaks hydrogen bonds. Asked by Larentis - Sun Nov 30 07:02:49 2008 - - 1 Answers - 0 Comments A. The urea will disrupt the precise 3 - D structure of the enzyme and as a result loss of activity will follow. Answered by Peter S - Sun Nov 30 07:21:06 2008 How do you find the molecular mass of Urea?
Q. Urea CH4N2O I missed our class covering this chapter and my friend told me the Molecular mass was the Molar mass of each substance in grams, and instead of writting grams you use amu. Is that right? C=12.01g H*4=4.032g N*2=28.02g O=16.00g So the molecular mass of Urea is 60.062 amu? Thanks for help Asked by simply_college - Sun Apr 20 14:05:24 2008 - - 1 Answers - 0 Comments A. Thats right! and to be sure, you can look it up, and your answer should be about 60.07g/mol (or amu). good job. Answered by tifforific - Sun Apr 20 14:09:40 2008 From Yahoo Answer Search: "urea"  tradershuddle.com Fri, 23 Jul 2010 15:09:43 GMT+00:00 TradersHuddle.com Its principal products in the nitrogen segment are ammonia, urea and urea ammonium nitrate solution and its principal products in the phosphate segment are ...  fool.com Tue, 27 Jul 2010 18:02:42 GMT+00:00 Motley Fool Ammonia and urea ammonium nitrate (UAN) are the two primary products the company sells. Source: Capital IQ, a division of Standard & Poor's, ...  jcarrot.org Tue, 20 Jul 2010 05:07:49 GMT+00:00 The Jew and the Carrot On February 26th 1993, terrorists detonated a 1500 pound urea nitrate bomb in a parking garage beneath the ... From Google News Search: "urea" From Yahoo Image Search: "urea"  allhydroponics.blogspot.com Daniel hu, 20 May 2010 15:15:00 GM Particularly since plants in soil absorb nitrogen as nitrate and ammonia it becomes worth asking if a slow releasing source of ammonia- such as . urea. - would improve the yields of our hydroponic system. On this post I will write a little ... From Google Blog Search: "urea"  video.google.com Sun, 25 Mar 2007 21:40:57 PDT Sinensis (Green Tea) Leaf Extract, Tocopherol, Ascorbyl Palmitate, Retinyl Palmitate, Simethicone, Methylparaben, Propylparaben, Imidazolidinyl ... video.google.com.  video.google.com Wed, 06 Aug 2008 15:48:33 PDT nitrosamines when they come in contact with nitrates. 3. Diazolidinyl Urea, Imidazolidinyl Urea These widely used preservatives commonly found ... video.google.com.  youtube.com Sat, 24 Apr 2010 23:59:27 PDT 15 days of homeopathic treatment has created overall improvement in a case of chronic renal failure. She has left many allopathic medicines in ... youtube.com. From Google Video Search: "urea" |
