论文部分内容阅读
初中化学教学历来任务重、时间紧。总复习该如何下手?这是大家面临的一个问题。从任务上看,总复习与阶段复习不同,它要紧扣全书的重点和基本要求。搞好复习工作,我认为可以从两个方面抓起: 一、有纲有目,相辅相成复习的“纲”在哪里?在“单质、氧化物、酸、碱、盐关系图”。它是初中化学研究对象的最精辟的小结。以它为“纲”,可以把全书的基本知识理成几个“目”。第一,物质分类的知识体系,涉及到物质的组成和结构。包括: 1.纯净物、混和物;单质、氧化物、酸、碱、盐“八大图”的内涵和典型代表物。 2.金属与非金属的原子结构特征;离子化合物和共价化合物的电子式。
Chemistry teaching in junior middle school has always been a heavy task and a tight schedule. How do you review the total review? This is a problem that everyone faces. From the point of view of the task, the total review is different from the review of the period, and it must closely follow the focus and basic requirements of the book. After reviewing the work well, I think we can start from two aspects: 1. Where is the “outline” where there is an outline, which complements the review, and the “map of simple substance, oxide, acid, alkali, and salt”? It is the most incisive summary of junior chemistry research subjects. Taking it as an “outline” can interpret the basic knowledge of the book into several “heads.” First, the knowledge system of material classification relates to the composition and structure of the material. Including: 1. Pure materials, blends; connotation and typical representative of the “big picture” of simple substance, oxide, acid, alkali and salt. 2. Atomic structural characteristics of metals and non-metals; electronic formulae of ionic compounds and covalent compounds.