在初中二年级,学生开始接触到系统的基本的化学知识。化学的第一堂课——绪言课是很重要的一节课。通过它可以使学生认识化学这门科学的概貌;化学对我们国家的社会主义建设起着什么作用;启发学生热爱化学知识,产生积极学习的动力;并初步知道化学学习的方法。因此,对“绪言”课要认真钻研和准备,以达到上述的效果。有的教师觉得“绪言”课只是个开场白,多说两句或少说两句没有多大关系,这是对绪言课的重要性认识不足的缘故;也有的教师对绪言课很重视,这是很好的,但过多地演示实验和堆积材料,使一个刚上初二的学生很难理解和接受,也会影响绪言课的效果。因此,需要深入钻研备课,收集材料,精选材料,以使课的内容丰富而精湛。本课的教学目的:使学生初步认识化学是怎样的 In the second grade of junior high school, students come into contact with the basic chemical knowledge of the system. Chemistry first lesson - Introduction lesson is a very important lesson. Through it, students can get an overview of the science of chemistry. What role does chemistry play in the socialist construction of our country? Inspire students to love chemistry and produce positive motivation to learn; Therefore, the “Introduction” class should be carefully studied and prepared in order to achieve the above effect. Some teachers think that “introduction” class is only an opening speech. It does not matter much to say two or less sentences, which is a lack of understanding of the importance of the introduction lesson. Some teachers attach great importance to the introduction lesson. Good, but too much demonstration of experimenting and stocking materials makes it hard for a student who has just completed the second grade to understand and accept. It also affects the effectiveness of the introduction lesson. Therefore, the need to drill down to prepare lessons, collect materials, selected materials, so that the contents of the lesson rich and exquisite. The purpose of this lesson is to give students a basic understanding of chemistry