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一、复习要求初中化学基本概念主要包括物质的性质与变化、组成与分类、结构与构成、化学用语、溶液的有关知识等五方面,近60个概念,依据《教学大纲》、《中考考试说明》可把它们划分四个层次:常识性介绍,如原子结构示意图、催化剂等概念,要有“大致印象”;了解,如物理性质、化学性质、分子、原子、pH等概念,要“知道是什么”;理解,如物理变化、化学变化、单质、化合物、质量守恒定律等概念,必须“懂得为什么”;掌握,如溶质质量分数等概念,一定要“灵活应用”.了解、理解、掌握层次是考查的重点,本部分知识在中考中占25％左右.
First, review requirements The basic concepts of junior high school chemistry mainly include five aspects: the nature and changes of substances, composition and classification, structure and composition, chemical terms, and knowledge of solutions. Nearly 60 concepts are based on the “syllabus” “They can be divided into four levels: common sense introductions, such as atomic structure diagrams, catalysts and other concepts, have ” approximate impression “; understanding, such as physical properties, chemical properties, molecules, atoms, pH and other concepts, to ”Know what “; understanding, such as the concept of physical change, chemical change, elementality, compound, conservation of mass, etc., must ” understand why“; grasp, such as the concept of solute mass fraction, must ”flexibly apply ". Understanding, understanding and mastering the level is the focus of examination. This part of knowledge accounts for about 25% in the examination.