水是人类宝贵的自然资源,与水相关的化学知识是中考化学考查热点之一,特别是水的组成及水电解实验、性质、硬水和软水等内容,在中考中出现概率较高。本文引领我们走进水的世界,总结近几年中考化学试题中对于《水的组成和净化》有以下几点常考内容: Water is a precious natural resource for mankind. Water-related chemical knowledge is one of the hottest points in the examinations of chemical examinations for senior high school entrance examination. In particular, the composition of water and the experiments on water electrolysis, its nature, hard water and soft water, are more likely to occur in the middle school entrance examinations. This article leads us into the water world, summarizes the recent years in the chemical test questions for the “water composition and purification,” the following regular exam content: