- published: 28 Sep 2015
- views: 272553
Urea (/juːˈriːə/) or carbamide (from the Greek word Ουρία) is an organic compound with the chemical formula CO(NH2)2. The molecule has two —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 a colorless, odorless solid, highly soluble in water, and practically non-toxic (LD50 is 15 g/kg for rats). Dissolved in water, it is neither acidic nor alkaline. The body uses it in many processes, most notably nitrogen excretion. The liver forms it by combining two ammonia molecules (NH3) with a carbon dioxide (CO2) molecule in the urea cycle. Urea is widely used in fertilizers as a source of nitrogen and is an important raw material for the chemical industry.
Friedrich Wöhler's discovery in 1828 that urea can be produced from inorganic starting materials was an important conceptual milestone in chemistry. It showed for the first time that a substance previously known only as a byproduct of life could be synthesized in the laboratory without biological starting materials, contradicting the widely held doctrine of vitalism.
The Professor discusses some of the chemistry behind the recent controversy involving Volkswagen cars. CLARIFICATION: While many diesel engines (including VW cars) use urea as discussed (marketed as AdBlue), we've heard from viewers explaining the technique VW "fiddled with the computer" used another NOX-removal technology. (The Prof is in India without web access but sends apologies for any confusion he caused) Periodic Videos on Patreon: https://www.patreon.com/periodicvideos Volkswagen on Words of the World: https://youtu.be/Nc34hc8tXO4 Carbon Dioxide: https://youtu.be/trhXiCxvzu4 More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos From the School of Chemistry at The Unive...
Itunes - https://itunes.apple.com/album/id1072005692?ls=1&app;=itunes Mediafire - http://www.mediafire.com/download/2qq5glg745li093/Urea-Varinder+Khaira.mp3 Soundcloud - https://soundcloud.com/varinderkhaira/urea-varinder-khaira Singer - Varinder Khaira (https://www.facebook.com/varinderkhairaofficial) ...
The Urea cycle is a biochemical pathway in which the free ammonia is converted into urea so that it can be easily excreted. Urea is the major end product of nitrogen metabolism in humans. Subscribe : https://www.youtube.com/channel/UCOmrniWfKi-uCD6Oh6fqhgw Watch Again : https://youtu.be/K3rVr_SfXo8
This video discusses the mechanism of how the application of urea to the soil surface without incorporation the soil with tillage or water can lead to NH3 losses. It also outlines those environmental conditions which favor loss.
UREA NEED TO BE SPREAD EVENLY OVER THE AREA BEING FERTILIZED IN ORDER TO WORK WELL. THE PROBLEM IS THAT IF YOU USE TO MUCH IT MAY BURN THE PLANTS BEING FERTILIZE AND IF YOU USE TO LITTLE YOU WILL NOT GET THE EFFECTS. I SIMPLE WAY TO MAKE SURE THIS DOESN'T HAPPEN IS TO DISSOLVE A SMALL AMOUNT OF UREA IN WATER. UREA WILL DISSOLVE IN ITS OWN WEIGHT OF WATER. UREA IS VERY SIMPLE TO DISSOLVE IN WATER. SIMPLY ADD THE DESIRED AMOUNT OF UREA TO A WATER BOTTLE FILLED WITH WATER. SHAKE THE BOTTLE AND ALLOW TO FULLY DISSOLVE OVERNIGHT. THEN DILUTE THIS UREA CONCENTRATE WITH MORE WATER. ONLY APPLE TO SOIL, THE UREA WITH STAIN THE LEAVES OF PLANTS.
This is a technique video that I have been asked to do for a while. I wanted to go over the basics. I might explore it a bit more in the future. I hope you guys like it. The introduction video is mostly from my video of converting sodium benzoate to benzoic acid. That is filmed in 4K and will be uploaded later. I plan to do an Q and A video, so if you have any questions you'd like me to address in the video, leave them in the comments. Music by Kevin Macleod - Music for Manatees Patreon: https://www.patreon.com/user?u=2448989&ty;=h Facebook: https://www.facebook.com/Nile-Red-1648800202046876/
what is urea fertilizer for plants in urdu/hindi by kitchen gardening click on this link to watch npk fertilizer https://www.youtube.com/watch?v=uDybEEJKK2Y subscribe our channel for daily updates what is urea:urea is a name of fertilizer and it is a good fertilizer for any kind of plants. you can use urea fertilizer in to your garden and container what is urea More than 90% of world production of urea is destined for use as a nitrogen-release fertilizer how to grow spinach https://www.youtube.com/playlist?list=PLTVpsxamkX9A57q57siMK2RNfyMiCPaKz growing salad leaves https://www.youtube.com/playlist?list=PLTVpsxamkX9BSHfhRyvPOpWUXu8m3vNs1 how to grow flowers from seeds https://www.youtube.com/playlist?list=PLTVpsxamkX9BgIFc0xg1roeg-MFfarfqO health care from herbs https://www.yout...
Vídeo explicativo sobre la urea.
So light is her footfall
She walks like a bird
She's an angel
Such a familiar stranger
I wish I could help her
She's in danger
She's all alone alone alone alone alone alone
All alone alone alone alone
So light is her footfall
She moves like a ghost
And I lost her
In the mist of dawn
She's already gone
And I miss her
She's all alone alone alone alone alone alone
All alone alone alone alone
And I miss her
And I miss her
She's all alone alone alone alone alone alone
All alone alone alone alone
So light was her footfall
So light was her footfall
So light was her footfall