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zinc

(Encyclopedia)zinc, metallic chemical element; symbol Zn; at. no. 30; at. wt. 65.38; m.p. 419.58℃; b.p. 907℃; sp. gr. 7.133 at 25℃; valence +2. Zinc is a lustrous bluish-white metal. It is found in Group 12 o...

caustic

(Encyclopedia)caustic, any strongly corrosive chemical substance, especially one that attacks organic matter. A caustic alkali is a metal hydroxide, especially that of an alkali metal; caustic soda is sodium hydrox...

Salinas Grandes

(Encyclopedia)Salinas Grandes sälēˈnäs gränˈdās [key], salt desert, c.3,200 sq mi (8,290 sq km), in Córdoba and Santiago del Estero provs., N Argentina. The Córdoba-Tucumán RR crosses the desert. Sodium a...

Jimma

(Encyclopedia)Jimma or Jima both: jĭmˈä [key], city (1994 pop. 88,867), Oromia region, SW Ethiopia. It is the commercial center for a coffee-producing region. Potassium and sodium nitrates are mined NE of the ci...

Berezniki

(Encyclopedia)Berezniki bĭryĕznyĭkēˈ [key], city, E European Russia, a port on the Kama River. Situated in an ...

potassium carbonate

(Encyclopedia)potassium carbonate, chemical compound, K2CO3, white, crystalline, deliquescent substance that forms a strongly alkaline water solution. It is available commercially as a white, granular powder common...

tabun

(Encyclopedia)tabun täˈbən [key], liquid chemical compound used as a nerve gas. It boils at 240℃ with some decomposition. The liquid is colorless to brownish; its vapors have a fruity odor similar to that of b...

bicarbonate

(Encyclopedia)bicarbonate or hydrogen carbonate, chemical compound containing the bicarbonate radical, –HCO3. The most familiar of such compounds is sodium bicarbonate (baking soda). See carbonate. ...

Fehling's solution

(Encyclopedia)Fehling's solution fāˈlĭngz [key], deep-blue, alkaline solution used to test for the presence of aldehydes (e.g., formaldehyde, HCHO) or other compounds that contain the aldehyde functional group, ...

borax

(Encyclopedia)borax or sodium tetraborate decahydrate sōˈdēəm tĕˌtrəbôrˈāt dĕkˌəhīˈdrāt [key], chemical compound, Na2B4O7·10H2O; sp. gr. 1.73; slightly soluble in cold water; very soluble in hot wa...