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Vladimir P. Demikhov was born on July 31, 1916, [4] into a family of Russian peasants living on a small farmstead in the northern part of Russia's Volgograd region. [5] His father, Peter Yakovlevich Demikhov was killed during the Russian Civil War when Demikhov was about three years old, [1] [5] so he and his brother and sister were raised by their mother, Domnika Alexandrovna, who managed to ...
These studies focused on topics such as radionuclide distribution and acute radiation effects, and involved relatively few dogs for short periods of time. [3] The first two major life-span experiments involving beagles began at the University of California, Davis, and at the University of Utah. [3]
The reaction is very beautiful, during which a bright flash occurs, and the so-called dog barking. Therefore, this experiment is called a barking dog. Before the invention of camera flashes, this reaction often has been used as the illuminator for photography.
The caesium chloride structure adopts a primitive cubic lattice with a two-atom basis, where both atoms have eightfold coordination. The chloride atoms lie upon the lattice points at the corners of the cube, while the caesium atoms lie in the holes in the center of the cubes; an alternative and exactly equivalent 'setting' has the caesium ions at the corners and the chloride ion in the center.
The experiment aimed to illustrate periodic trends in the alkali metal series. It showed the violent reactions of metallic sodium and potassium with water, in which the hydrogen produced subsequent explosions, and intended to demonstrate the even greater reactivity of rubidium and caesium by dropping them into a water-filled bathtub. The ...
Video of a barking dog reaction by Maxim Bilovitskiy. The "Barking Dog" is an exothermic chemical reaction that results from the ignition of a mixture of carbon disulfide and nitrous oxide. [1] When ignited in a cylindrical tube, the reaction produces a bright flash and a loud "woof" - reminiscent of a barking dog.
Robert Wilhelm Eberhard Bunsen (German: [ˈʁoːbɛʁt ˈbʊnzn̩]; 30 March 1811 [a] – 16 August 1899) was a German chemist.He investigated emission spectra of heated elements, and discovered caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff. [11]
Caesium-135 is a mildly radioactive isotope of caesium with a half-life of 1.33 million years. It decays via emission of a low-energy beta particle into the stable isotope barium-135. Caesium-135 is one of the seven long-lived fission products and the only alkaline one.