EF: “The abundance of substances ofwhich animals and plants are composed,the remarkable processes whereby theyare formed and then broken down againhave claimed the attention of mankindand from the early days they alsopersistently captivated the interest ofchemists
EF: “The abundance of substances of which animals and plants are composed, the remarkable processes whereby they are formed and then broken down again have claimed the attention of mankind and from the early days they also persistently captivated the interest of chemists.
Noteworthy successes were notachieved by science until 18th centurywhen men like Sigismund Marggraf inBerlin, Lavoisier in Paris and CarlWilhelm Scheele in Sweden studied it.Difficulty and necessity made theresearch separate from mineralchemistry then became a special branchofourscience
Noteworthy successes were not achieved by science until 18th century when men like Sigismund Marggraf in Berlin, Lavoisier in Paris and Carl Wilhelm Scheele in Sweden studied it. Difficulty and necessity made the research separate from mineral chemistry then became a special branch of our science.
Organic chemistryIt found the exploration of new avenuesmore worthwhile. It replaced the animal andvegetable substances by many artificialproducts such as the hydrocarbons andcyano compounds, wood tar and coal tar,wood alcohol,etc
It found the exploration of new avenues more worthwhile. It replaced the animal and vegetable substances by many artificial products such as the hydrocarbons and cyano compounds, wood tar and coal tar, wood alcohol, etc
FriedrichWohler[NH4"][NCO]18281800-1882AgNCO+NH4CI→(NH2)2CO+AgCIThis discovery prompted Wohler to writetriumphantly to Berzelius: "I must tell you that I canmake urea without the use of kidneys,either manor dog. Ammonium cyanate is urea
1800—1882 1828 This discovery prompted Wöhler to write triumphantly to Berzelius: "I must tell you that I can make urea without the use of kidneys, either man or dog. Ammonium cyanate is urea
Chemistryin19century1856.A.D.New dyes synthesises by William Perkin, Sr.from coal tar. Bessemer's converter revolutionises iron smeltingprocess.Industriesboomasaresultofchemicalprogress.1858 A.D.FriedrichKekuledefines the concept of valency,andwith Couper discovers the tetravalent quality of carbon1866 A.D.Kekule propunds his theory of the molecular structure of benzene.1869.A.D.The periodic law is put forward byDmitri Mendeleev and simultaneously and independently by Julius Meyer
+Chemistry in 19 century