(i)由钠至氩遵循同周期元素递增的规律,解释为两分,即:increasing/more nuclear charge; has same number of shells/removing electrons form same shell。 (ii)铝的电离能低于镁遵循3主族低于2主族的规律:Al’s first ionisation is removing electron form higher energy level than Mg; Al has more electrons...
111 -- 10:05 App Fractional Distillation_ Ethanol and Water Separation 36 -- 11:26 App DWSIM教程03 蒸馏工艺Shortcut Distillation 474 9 9:54 App 给室友的简单蒸馏及分馏 2931 4 13:18 App 蒸馏及沸点的测定 演示视频 1.3万 32 4:35 App 石油的分馏 85 -- 9:29 App Simple distillation...
A Level Biology Revision Measuring the Rate of Enzyme Controlled Reactions 42 -- 2:22 App A Level Biology Revision Alpha and Beta Glucose.mp4 17 -- 4:40 App A Level Chemistry Revision Separation of Alkanes by Fractional Distillation.mp4 20 -- 3:52 App A Level Biology Revision Stages in...
III) Preparation Fractional distillation of crude oil Reduction of alkene IV) Physical property Boiling point: very low States 1-4 carbons: gaseous 5-16 carbons: liquid More than 16 carbons: solid Solubility Water: insoluble Organic solvent: very soluble ...
b) Fractional distillation. This technique has a number of important applications: • used to separate the components of liquid air; The air is compressed and cooled to liquefy o o o it. Fractions are oxygen -183 C, argon -186 C, and nitrogen -196 C. • used to separate fractions ...
fractional distillation: separation of compounds by their boiling points structural isomerism: same molecular formula but different structure How does cis-trans isomerism arise? (1)Restricted rotation about a C=C bond (2)two different group on each side of C=C. ...
In a fractional distillation process in which first (light key) and second (heavy key) components contained in a feed stream are separated with the major portion of the light key component being removed in an overhead product stream and the major portion of the heavy key component being ...
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Fractional distillation as a simple technique for the preconcentration of volatile impurities 来自 Semantic Scholar 喜欢 0 阅读量: 6 作者:VA Shalygin,VG Maksimov,GE Smirnova 摘要: Radiochemical analysis is an important means of determining the magnitude of critical nuclear incidents. On the basis of...
A fractional distillation process, in which the flow rate of the external reflux is utilized to control the bottoms product composition, is controlled so as to maintain a desired bottoms product composition to the extent that maintaining the desired bottoms product composition does not cause a ...