chem(o) 化学（的） chemistry 化学 chemical 化学的，化学药品 chemosynthesis 化学合成
化合物分类
现今，化学家知道了成千上万的化合物。
It would be impossible to learn properties and behavior of even a fraction of this number if it had to be done on the basis of individual compounds.
anhydride 酐
sour 酸的，酸味的；变酸
basic anhydride 碱酐
taste 味道，气味，味觉
negative 负的，阴的
lemon 柠檬
acid radical 酸根
orange 柑，桔；橙色
share 共享，分享
citric 柠檬的
transfer 转移
citric acid 柠檬酸
methyl orange 甲基橙 phenolphthalein 酚酞 react (with, on) 反应 strong acid 强酸 ionize 离子化，电离 bitter 苦味
soapy 肥皂般的，滑腻的 slippery 滑的 neutralization 中和 evaporation 蒸发 positive 正的，阳的 positive ion 正离子 negative ion 负离子
coordinate 配位
citrus 柑桔属
coordinate valence 配键
lactic 乳的
hydronium ion 水合氢离子 lactic acid 乳酸
litmus 石蕊 litmus paper 石蕊试纸 dye 染料 soak 浸泡，浸渍 enable 使……能够 indicator 指示剂 methyl 甲基
幸运的是，大多数化合物能够组合在一起分成几类。
Then, if we can properly classify a compound, we are at once aware of the general properties of the compound from knowledge of the properties of that class or group of compounds.
lattice 格子，点阵 crystal lattice 晶格 electrovalent 电价的 orient 定向，取向 pattern 模型，形式
The Classes of Compounds
1.Thousands and tens of thousands of compounds are known to the chemist today. It would be impossible to learn properties and behavior of even a fraction of this number if it had to be done on the basis of individual compounds. Fortunately, most chemical compounds can be grouped together in a few classes. Then, if we can properly classify a compound, we are at once aware of the general properties of the compound from knowledge of the properties of that class or group of compounds. For example, HCl is classed as an acid, and by becoming familiar with the behavior of acids as a distinct class, we are at once aware of the general properties of the compound. A great many of the compounds we are to study may be classified as acids, bases, salts, metallic oxides, or nonmetallic oxides. Of these five classes of compounds, the first three-acids, bases, and salts-are by far the most important.
• be aware of 知道，意识到……
那么，如果我们能够恰当地将一个化合物归类，我们立 刻就能从这类化合物的性质来了解这个化合物的一般性 质。
பைடு நூலகம்
The Classes of Compounds
Thousands and tens of thousands of compounds are known to the chemist today.
• thousands and tens of thousands成千上万 • be known to被……所知
•a fraction of 一小部分 •on the basis of 根据……, 在……基础上
如果根据个别化合物来了解这么多化合 物的性质，即使其中的一小部分也是不可 能的。
Fortunately, most chemical compounds can be grouped together in a few classes.
Lesson 2
THE CLASSIFICATION OF INORGANIC COMPOUNDS
无机化合物分类
词汇
chemist 化学家
equation 方程式
become 适合，与……相称 aqueous 水的
radical 基，根，原子团
balance 天平，平衡
acidic 酸的，酸性的
substance 物质