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locofoco n. 摩擦火柴 摩擦火柴 Locofoco \ Lo` co* fo" co\, n. [ Of uncertain etymol.; perh. for L. loco foci instead of fire; or, according to Bartlett, it was called so from a self- lighting cigar, with a match composition at the end, invented in 1834 by John Marck of New York, and called by him locofoco cigar, in imitation of the word locomotive, which by the uneducated was supposed to mean, self- moving.] 1. A friction match. [ U. S.] [ 1913 Webster] 2. A nickname formerly given to a member of the Democratic party. [ U. S.] [ 1913 Webster] Note: The name was first applied, in 1834, to a portion of the Democratic party, because, at a meeting in Tammany Hall, New York, in which there was great diversity of sentiment, the chairman left his seat, and the lights were extinguished, for the purpose of dissolving the meeting; when those who were opposed to an adjournment produced locofoco matches, rekindled the lights, continued the meeting, and accomplished their object. [ 1913 Webster]
Lucifer \ Lu" ci* fer\, n. [ L., bringing light, n., the morning star, fr. lux, lucis, light ferre to bring.] [ 1913 Webster] 1. The planet Venus, when appearing as the morning star; -- applied in Isaiah by a metaphor to a king of Babylon. [ 1913 Webster] How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground which didst weaken the nations! -- Is. xiv. 12. [ 1913 Webster] Tertullian and Gregory the Great understood this passage of Isaiah in reference to the fall of Satan; in consequence of which the name Lucifer has since been applied to Satan. -- Kitto. [ 1913 Webster] 2. Hence, Satan. [ 1913 Webster] How wretched Is that poor man that hangs on princes' favors! . . . When he falls, he falls like Lucifer, Never to hope again. -- Shak. [ 1913 Webster] 3. A match[ 1] made of a sliver of wood tipped with a combustible substance, and ignited by friction; -- called also { lucifer match}, and { locofoco}, now most commonly referred to as a { friction match}. See { Locofoco}. [ 1913 Webster] 4. ( Zool.) A genus of free- swimming macruran Crustacea, having a slender body and long appendages. [ 1913 Webster]
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为什么可以用溴的四氯化碳溶液鉴别乙苯和苯乙烯?乙苯萃取溴还是有颜色的,苯乙烯直接反应就母得颜色了
- 如何仅用溴水鉴别乙烯,苯和四氯化碳?_作业帮 - zuoyebang
乙烯会与溴水发生加成反应,使溴水褪色 溴水中加苯上层为溴和苯溶液橙黄色,下层为水 而溴水中家四氯化碳则上层为水,下层为四氯化碳溶解溴的油层 解析看不懂?
- 乙苯和苯乙烯都能使溴的四氯化碳溶液褪色,为什么不能用它 . . .
乙苯可以和溴反应,但是和溴的四氯化碳在常温和无催化剂条件下基本上等同于不反应。 而苯乙烯和溴反应相对要快很多。 发布于 2020-03-23 13:16
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溴水与苯:混合后,不发生化学变化,但溶液分层,因为溴在苯中的溶解度大于水中,上层橙黄色,下层无色(水密度大,在下层) 溴水与CCl4:混合后,不发生化学变化,分层,上层无色,下层橙黄色(水密度小在上层,原理同上)
- 关于苯和液溴溴水溴的四氯化碳溶液的问题,谁能解答一下?
苯不会萃取溴的四氯化碳溶液,因为苯和四氯化碳是可以混溶的,只会出现相互溶解的情况。 但苯可以萃取溴水中的溴。 苯与液溴在催化剂(铁、溴化铁)作用下可以反应褪色
- 溴的四氯化碳溶液可以鉴别什么,溴的四氯化碳溶液能鉴别什么 . . .
溴的四氯化碳溶液,经常用于证明有机化合物的分子中存在不饱和键,这些带有不饱和键的物质,能使溴的四氯化炭溶液褪色,例如乙烯、乙炔等。
- 苯乙烯与溴的四氯化碳溶液反应方程式_作业帮 - zuoyebang
苯乙烯与溴的四氯化碳溶液发生反应的化学方程式 乙醛与溴的四氯化碳溶液反应的方程式? 乙烯与溴的四氯化碳反应的化学方程式
- 用溴的四氯化碳溶液怎样鉴别乙烯和苯 - 百度知道
乙烯通入溴的四氯化碳溶液褪色 苯通入溴的四氯化碳溶液不褪色
- 溴水是如何鉴别苯、四氯化碳、乙醇和苯酚的? - 盖德问答
7.羰基化合物: (1) 鉴别所有的醛酮:2,4-二硝基苯肼,产生黄色或橙红色沉淀; (2) 区别醛与酮用托伦试剂,醛能生成银镜,而酮不能; (3) 区别芳香醛与脂肪醛或酮与脂肪醛,用斐林试剂,脂肪醛生成砖红色沉淀,而酮和芳香醛不能; (4) 鉴别
- 用溴水可以区分甲苯,苯,四氯化碳吗? - 雨露学习互助
只有甲苯不能使溴水变色, (甲苯可以使酸性高锰酸钾变色 ) 四氯化碳可以萃取溴水中的溴,溴在下层 如果是烯烃或者炔烃,换掉甲苯是可以鉴别的
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