Articles from Britannica Encyclopedias for elementary and high school students. CdS; SnS 2; BaCrO 4 is a yellow precipitate. Bromine dissolves in aqueous alkali hydroxide solutions, giving bromides, hypobromites, or bromates, depending on the temperature. Sulfurous acid is oxidized by bromine water to sulfuric acid. Bromine is readily extracted from water by organic solvents such as carbon tetrachloride, chloroform, or carbon disulfide, in which it is very soluble. Silver fluoride is soluble, and so you don't get a precipitate. Free bromine is a reddish brown liquid with an appreciable vapour pressure at room temperature. In the organic solvents it gives an orange solution. An organic bromo compound resembles the corresponding chloro derivative but is usually more dense, less volatile, less combustible, and less stable. Let us know if you have suggestions to improve this article (requires login). Our editors will review what you’ve submitted and determine whether to revise the article. The industrial usage of bromine had been dominated by the compound ethylene bromide (C2H4Br2), which once was added to gasoline with tetraethyl lead to prevent deposition of lead in the engine. Because of the bad odour of the element, the French Academy of Sciences suggested the name bromine, from the Greek word bromos, meaning “bad smell” or “stench.”. Other bromine compounds of significance include hydrogen bromide (HBr), … Premium Membership is now 50% off! But oxidation states of 0 (elemental bromine, Br2), +1 (hypobromite, BrO−), +3 (bromite, BrO−2), +5 (bromate, BrO−3), and +7 (perbromate, BrO−4) are also known. Bromine (Br), chemical element, a deep red noxious liquid, and a member of the halogen elements, or Group 17 (Group VIIa) of the periodic table. precipitate color of anion. Traces of potassium bromate (KBrO3) are added to wheat flour to improve baking. The solution is known as bromine water. Natural bromine is a mixture of two stable isotopes: bromine-79 (50.54 percent) and bromine-81 (49.46 percent). A solution of the gas in water is called hydrobromic acid, a strong acid that resembles hydrochloric acid in its activity toward metals and their oxides and hydroxides. Bromine combines violently with the alkali metals and with phosphorus, arsenic, aluminum, and antimony but less violently with certain other metals. Silver bromide (AgBr), an important component of photographic film, is, like silver chloride and iodide, light sensitive. The precipitates are the insoluble silver halides - silver chloride, silver bromide or silver iodide. Updates? Confirming the precipitate using ammonia solution The chief commercial source of bromine is ocean water, from which the element is extracted by means of chemical displacement (oxidation) by chlorine in the presence of sulfuric acid through the reaction. Like chlorine water, it is a good oxidizing agent, and it is more useful because it does not decompose so readily. Silver chloride (AgCl) gives a white precipitate. Silver bromide (AgBr), an important component of photographic film, is, like silver chloride and iodide, light sensitive. Known also as bromoyrite, silver bromide (AgBr) boils at 1,300 degrees Celsius, melts at 42 degrees Celsius, and is insoluble in water. Black Friday Sale! Some enrichment occurs in ocean water (65 parts per million by weight), in the Dead Sea (approximately 5 grams per litre [0.7 ounce per gallon]), in some thermal springs, and in rare insoluble silver bromide minerals (such as bromyrite, found in Mexico and Chile). The most stable oxidation state of the element is −1, in which bromine occurs naturally. It is, however, a less powerful oxidizing agent, chiefly because of the weaker hydration of the bromide ion as compared with the chloride ion. Other bromine compounds of significance include hydrogen bromide (HBr), a colourless gas used as a reducing agent and a catalyst in organic reactions. About 3.41 grams (0.12 ounce) of bromine dissolve in 100 millilitres (0.1 quart) of water at room temperature. The periodic table is made up of 118 elements. Bromine was discovered in 1826 by the French chemist Antoine-Jérôme Balard in the residues (bitterns) from the manufacture of sea salt at Montpellier. In sunlight bromine water decomposes, with release of oxygen, as in the following equation: From bromine water a hydrate (a clathrate) can be isolated that contains 172 water molecules and 20 cavities capable of accommodating the bromine molecules. Bromine has other uses, as in making various dyes and the compounds tetrabromoethane (C2H2Br4) and bromoform (CHBr3), which are used as liquids in gauges because of their high specific gravity. The similarity of this procedure to that for making chlorine suggested to Balard that he had obtained a new element similar to chlorine. It forms a pale yellow powder that has no odor, a molecular weight of 187.78, and crystals that do not cleave. The electron affinity of bromine is high and is similar to that of chlorine. It is formed artificially by exposing plates of silver to the vapor of bromine, or by decomposing nitrate of silver by … Traces of potassium bromate (KBrO 3) are added to wheat flour to improve baking. Compounds with the oxidation numbers +1, +3, +4, +5, and +7 all contain covalent bonds. Similarly, a metal-bromine bond is weaker than the corresponding metal-chlorine bond, and this difference is reflected in the chemical reactivity of bromine, which lies between that of chlorine and that of iodine. In this quiz you’ll be shown all 118 chemical symbols, and you’ll need to choose the name of the chemical element that each one represents. Of the 17 known radioactive isotopes of the element, bromine-77 has the longest half-life (57 hours). Yellow colour metal sulfides. Precipitates have different colours.


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