Johann wolfgang döbereiner pronunciation
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Johann Wolfgang Döbereiner
Johann Wolfgang Döbereiner (13 December 1780 in Hof – 24 March 1849 in Jena)[1] was a Germanchemist. He is best known for the development of the so-called Döbereiner's lamp. This is one of the first lighters.[2][3][4]
Döbereiner was a professor for chemistry, pharmacy and technology at the university of Jena. He was a friend of the German writer Johann Wolfgang von Goethe.[5]
He also studied oxidations of chemical elements. In 1832, he could oxidate (sulfur dioxide) to (sulfur trioxide).[1]
References
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Johann Wolfgang Dobereiner
As the number of elements increased, chemists inevitably began to find patterns in their properties. In 1829 Johann Wolfgang Dobereiner discovered the existence of families of elements with similar chemical properties. Because there always seemed to be three elements in these families, he called them triads. Each of the vertical columns in Table 7.1 represents one of these triads.
A.N.: Insert Table 7.1 in the margin here
TABLE 7.1
Dobereiner's Triads
Li Ca S Cl Mn
Na Sr Se Br Cr
K Ba Te I Fe
Dobereiner's triads grouped elements with similar chemical properties. Consider lithium, sodium, and potassium, for example.
1. These elements all react with water at room temperature.
2. They react with chlorine to form compounds with similar formulas: LiCl, NaCl, and KCl.
3. They combine with hydrogen to form compounds with similar formulas: LiH, NaH, and KH.
4. They form hydroxides with similar formulas: LiOH, NaOH, and KOH.
Dobereiner also found patterns in the physical properties of the elements in a triad. He noted, for ex
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Johann Wolfgang Döbereiner
(1780–1849) German chemist
Born the son of a coachman in Hof an der Saale, Germany, Döbereiner had little formal education and had worked as an assistant to apothecaries in several places from the age of 14. He was largely self-taught in chemistry and was encouraged by Leopold Gmelin whom he met at Strasbourg. After several failures in business, he was appointed assistant professor of chemistry at Jena (1810).
In 1823 he discovered that hydrogen would ignite spontaneously in air over platinum sponge, and subsequently developed the Döbereiner lamp to exploit this phenomenon. Döbereiner was interested in catalysis in general and discovered the catalytic action of manganese dioxide in the decomposition of potassium chlorate. His law of triads (1829), based on his observation of regular increments of atomic weight in elements with similar properties, was an important step on the way to Dmitri Mendeleev's periodic table. Thus in triads such as calcium, strontium, and barium or chlorine, bromine, and iodine, the middle element has an atomic weight that is
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