In chemistry, a compound is a substance made up of two or more different chemicalelementscombined in a fixed ratio. When the elements come together, they react with each other and form chemical bonds that are difficult to break. These bonds form as a result of sharing or exchangingelectronsbe...
2. My friend's family lives in the compound. 我朋友的家住在那个大院里。 compound 网络解释 1. 1. 化合物:化合物--阴离子部分的晶体结构 化合物(compound)是指从化学反应之中所产生,由两种或两种以上元素构成的纯净物(区别于单质). 例如:氯化钠(NaCl)是一种通过盐酸(HCl)和氢氧化钠(NaOH)的化学作用(...
3. in grammar, a compound sentence is one that is made up of two or more main clauses. 复合的(句子) ADJ n v. to compound a problem, difficulty, or mistake means to make it worse by adding to it. 使恶化,使复杂,加剧,加重 V n / Formal to make a difficult situation worse by addi...
(2) the formation of coloured complexes, such as the tetrachlorocobaltate(2−) ion, which can be determined spectrophotometrically—that is, by means of their light absorption properties, and (3) the preparation of complexes, such as metal acetylacetonates, which can be separated from aqueous...
In the formulas of ionic compounds, simple ions are represented by thechemical symbolfor the element: Cl means Cl−, Na means Na+, and so on. When individual ions are shown, however, the charge is always included. Thus, the formula of potassium bromide is given as KBr, but, when the...
Copper chemistry is remarkably complex. Just to give you an idea, the chloride ions play an important role in this reaction. E.g. if you do the same with hydrogen peroxide and dilute sulphuric acid, then you'll see that the reaction is much slower. The special thing is that Cu2+ ...
In dynamic HS, analytes are continuously purged by means of aninert gasand transferred into a cryogenic or sorbent packed trap, and then thermally desorbed and released into the GC.Fig. 5.4illustrates the basic principle of dynamic HS extraction. In general, dynamic HS extraction can be directly...
In air pollution control: Control of gases …criteria pollutants, as well as volatile organic compounds (VOCs) and other gaseous air toxics, are controlled by means of three basic techniques: absorption, adsorption, and incineration (or combustion). These techniques can be employed singly or in ...
means that the outervalence electronsare more loosely held, being further removed from the influence of the positive nuclear charge. Such loosely heldelectronsare said to be more polarizable, allowing them to engage in bonding interactions with electrophilic partners more easily and earlier during the...
Writing Compound Formulas By convention, when atoms form a compound, its formula lists the atom(s) acting as a cation first, followed by the atom(s) acting as the anion. This means sometimes an atom may be first or last in a formula. For example, in carbon dioxide (CO2), carbon (C)...