根据物质的组成和性质对物质进行分类,是在系统学习化学过程中的关键.这类题目在高考理科综合中频频出现.现就典型的混合物和纯净物、单质、化合物、氧化物、酸、碱、盐等概念进行概括,提高学生灵活运用知识解决实际问题的能力.1纯净物和混合物混合物是由2种或2种以上的物质混 According to the composition and nature of the material classification of substances in the system of learning chemistry is the key.This type of topic in college entrance examination often appear in science synthesis.Now the typical mixture and pure substance, chemical composition, oxides, acids, Alkali, salt and other concepts to improve students’ ability to apply knowledge to solve practical problems.1 pure substance and mixture mixture is composed of two or more than two substances