Suchergebnisse
Suchergebnisse:
Vor einem Tag · It was isolated again by Peter Woulfe in 1767, by Carl Wilhelm Scheele in 1770 and by Joseph Priestley in 1773 and was termed by him 'alkaline air'. Eleven years later in 1785, Claude Louis Berthollet ascertained its composition.
- NH₃
- 47% w/w (0 °C), 31% w/w (25 °C), 18% w/w (50 °C)
- 17.031 g·mol−1
- −77.73 °C (−107.91 °F; 195.42 K) (Triple point at 6.060 kPa, 195.4 K)
Vor 6 Stunden · The same year, Berzelius became the first to prepare silicon tetrachloride; silicon tetrafluoride had already been prepared long before in 1771 by Carl Wilhelm Scheele by dissolving silica in hydrofluoric acid. In 1823 for the first time Jacob Berzelius discovered silicon tetrachloride (SiCl 4).
- crystalline, reflective with bluish-tinged faces
- see Allotropes of silicon
Vor 6 Stunden · Scheele, Lord of the Admiralty Ove Wilhelm Michelsen and the President of the Council Carl Christopher Andræ advised the king that a Swedish-Norwegian proposal should be considered. Frederick VII himself wrote the first draft of a response, which was highly sympathetic but inconclusive. However, this version of his letter was never sent. Instead, Scheele intervened and offered to formulate ...
Vor 6 Tagen · Tra i pigmenti più popolari c'era il verde di Scheele, scoperto nel 1775 dal chimico tedesco-svedese Carl Wilhelm Scheele. Questo pigmento, economico e brillante, derivava da una...
Vor 4 Tagen · It was first identified in the 1770s by Swedish pharmacist Carl Wilhelm Scheele and independently by British chemist Joseph Priestley, who both released oxygen by heating mercuric oxide. However, it was Antoine Lavoisier who later named the gas “oxygen” and established its role in combustion and respiration, reshaping the course of chemistry and life sciences.
Vor 5 Tagen · Ce nom est tiré de Carl Wilhelm Scheele, un chimiste germano-suédois qui découvrit en 1775 qu’un pigment vert vif pouvait être produit à partir de cuivre et d’arsenic. Ce colorant était bon marché à fabriquer. De plus, il était également plus vibrant que les verts au carbonate de cuivre utilisés depuis plus d’un siècle.
Vor 4 Tagen · Junto con Emanuel Swedenborg, Carl von Linné y Carl Wilhelm Scheele, Celsius fue uno de los grandes científicos que introdujeron en Suecia las nuevas tendencias de las ciencias naturales, la visión newtoniana del mundo y la investigación experimental.
