Search results
Results From The WOW.Com Content Network
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] The Bunsen–Kirchhoff Award for spectroscopy is named after Bunsen ...
Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. [9] Rubidium is the first alkali metal in the group to have a density higher than water.
In 1860, the unexpected appearance of sky-blue and dark red was observed in spectral emissions by Robert Bunsen and Gustav Kirchhoff, leading to the discovery of two alkali metals, caesium and rubidium (dark red). [4] [1] Today, this low-cost method is used in secondary education to teach students to detect metals in samples qualitatively. [2]
It is the major source of the alkali metal rubidium. [13] In 1861, Robert Bunsen and Gustav Kirchhoff extracted 150 kg (330 lb) of lepidolite to yield a few grams of rubidium salts for analysis, and therefore discovered the new element rubidium. [14] [15] It occurs in granite pegmatites, in some high-temperature quartz veins, greisens and granites.
Substances may be excreted to the surface of the plant or into intercellular cavities or canals. Some of the many substances contained in the secretions are not further utilized by the plant (resins, rubber, tannins, and various crystals), while others take part in the functions of the plant (enzymes and hormones).
Thinking of plants as lives that serve their own purposes opens up a distinct way of understanding our connection to them. They are independent from us and yet knowable; otherworldly and yet familiar.
The Bunsen cell generates about 1.9 volts which arises from the following reaction: [1]. Zn + H 2 SO 4 + 2 HNO 3 ⇌ ZnSO 4 + 2 H 2 O + 2 NO 2 (g). According to the reaction above, when 1 mole (or part) each of zinc and sulfuric acid react with 2 moles (or parts) of nitric acid, the resultant products formed are, 1 mole (or part) of zinc sulfate and 2 moles (or parts) each of water and ...
In today's puzzle, there are eight theme words to find (including the spangram). Hint: The first one can be found in the top half of the board. Here are the first two letters for each word: SC. CO ...