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复合物质 |
The Class of Substances that contain two or more elements (ElementalSubstances) in definite proportion by weight. The composition of a pure compound will be invariant, regardless of the method of preparation. Compounds are composed of more than one kind of atom (element). The term molecule is often used for the smallest unit of a compound that still retains all of the properties of the compound. Examples: Table salt (sodium chloride, NaCl), sugar (sucrose, C_{12}H_{22}O_{11}), and water (H_2O).
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醇 | OrganicCompounds that are produced from hydrocarbons by distillation. |
| | 氨基酸 | Organic acids that are the building blocks of Proteins. |
| | 烃 | Any OrganicCompound that contains only Carbon and Hydrogen. |
| | 类固醇 | A class of OrganicCompounds having the same basic chemical structure and having significant physiological effects. |
| | 尿素 | Urea is a dry, soluble, nitrogenous substance that is the major solid component of the urine of mammals, and which may be synthesized from ammonia and carbon dioxide, it is useful in the production of Plastic and in Fertilizers. |
| | WoodProduct | Products made from Wood material. |