论文部分内容阅读
1.通过初中化学第七章最重要的几种酸、硷、氧化物和盐的教学使学生形成金属氧化物、非金属氧化物以及酸、硷、盐的正确概念,对物质的分类有个初步轮廓。奠立更进一步学习金属和非金属元素及其化合物的基础。碳是自然界分布很广的一种非金属元素,其化合物种类很多。它与呼吸、燃烧、营养及日常生活的很多现象有紧密的关联,而这些现象又是学生们所常见的。讲授起来要比其他非金属元素(如硫、磷、矽等)容易接受。所以初中教材中出“碳”为非金属元素的代表是很恰当的。学生在前几章中曾学习过:碳在氧中燃烧、空
1. Through the teaching of the most important acids, bases, oxides and salts in Chapter VII of Chapter 7 of the Chemistry of Junior High School, students are allowed to form correct concepts of metal oxides, nonmetal oxides, and acids, bases and salts, and have a classification of substances Initial outline. Lay the foundations for further learning of metallic and non-metallic elements and their compounds. Carbon is a non-metallic element that is widely distributed in nature and has many kinds of compounds. It is closely related to many phenomena of breathing, burning, nutrition and daily life, and these phenomena are common to students. It is easier to teach than other non-metallic elements (sulfur, phosphorus, silicon, etc.). Therefore, junior high school textbooks in the “carbon” for the non-metallic elements of the representative is very appropriate. Students learned in previous chapters that carbon burns in oxygen and is empty