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在普通高中化学科目的考试说明中,对于化学实验基础,要求学生“了解过滤、结晶、萃取、蒸馏等物质分离、提纯的常用方法,能对常见的物质进行分离和提纯。”对于这部分基础实验及操作的内容,除了在单项选择题中考查,更多地出现在了实验综合题中。结合近几年高考以及模考中对基本操作的考查,笔者认为可以沿着“结晶—过滤—洗涤—干燥”这条线索展开复习。例(2011江苏卷)高氯酸铵(NH4ClO4)是复合火箭推进剂的重要成分,
In the general senior high school chemistry subject examination description, for the chemical experiment basis, the student “understands the filtration, the crystallization, the extraction, the distillation and so on material separation, the purification common method, can the common material carry on the separation and the purification. ” Part of the basic experimental and operational content, in addition to test in a single multiple choice questions, more in the experimental synthesis of questions. Combined with the recent years college entrance examination and the test of the basic operation of the test, I believe that along the “crystallization - filtration - washing - dry” clues to start review. Example (2011 Jiangsu volume) ammonium perchlorate (NH4ClO4) is an important component of the rocket propellant,