| 1.Each of these compounds contains at least one ring that consists of six carbon atoms, each joined to at least two other carbon atoms, and each joined to adjacent carbon atoms by one single and one double bond.译文： 这些化合物中的每一个至少包含一个六个碳原子组成的环，每个碳原子连接着至少两个其他的碳 | |
| | 2.Molecules are made up of two or more atoms, either of the same element or of two or more different elements, joined by one or more covalent chemical bonds.译文：化合物由两个或两个以上原子组成，同种元素或不同的两种及两种以上元素的原子之间依靠一或多个离子键结合。 | |
| | 3.The elements are sometimes grouped according to their properties.译文： 元素有时可根据他们的性质成组。 | |
| | 4.In organic chemistry, compounds composed of carbon and hydrogen are divided into two classes: aromatic compounds, which contain benzene rings or similar rings of atoms, and aliphatic compounds, which do not contain aromatic rings.译文：在有机化学中，由碳和氢组成的化合物可分为两大 | |
| | 5.A suitable indicator should be chosen, preferably one that will experience a change in color (an end point) close to the equivalence point of the reaction.译文： 应该选择合适的指示剂，最好是选择那种在反应终点会改变性质的物质。 | |
| | 6.This is best achieved by washing a hanging drop from the tip of the burette into the flask right at the end of the titration to achieve a drop that is smaller in volume than what can usually be achieved by just dripping solution off the burette.译文：这一目标（指反应终点）可通过在滴定即将结束时，利用蒸馏水清洗悬挂于滴定管尖端的液滴并汇入烧瓶来实现，该液滴体积上要比通常从滴定管滴下的液滴小得多。 | |
| | 7.The alchemists believed that metals could be converted into gold with the aid of a marvelous mineral called the philosopher's stone, which they never succeeded in finding or making. 译文： 炼金师们相信在一种令人惊异的矿物——点金石的帮助下，金属能够转变成黄金，但他们从未成功地找到或制成这种石头。 | |
| | 8.Most people believed that natural processes were controlled by spirits, and they relied on magic to persuade the spirits to help while they conducted practical operations.译文：现在，大多数人认为自然过程可由人脑控制，并且在他们做物理操作时魔力可帮助他们说服大脑。 | |
| 1.弱碱 | |
| | 2.inert gas | |
| | 3.熔点 | |
| | 4.neutralization reaction | |
| | 5.2-methyl propane | |
| | 6.Bunsen burner | |
| | 7.甲基橙 | |
| | 8.锥形瓶 | |
| | 9.chemical symbol | |
| | 10. in the proper proportions | |
| | 11.芳香族化合物 | |
| | 12.triple bonds | |
| | 13.positively charged | |
| | 14.phlogiston theory | |
| | 15.atomic weight | |
|
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