初中学生在刚开始学习化学时,由于教学内容丰富多彩,可参与性强,从学生身边的物质说起,通过教师的旁引博证,能够使学生对研究物质充满新奇,再加上学科特色的实验教学,绝大多数学生对学习化学兴趣很高。但是,随着学习时间的延长,学习内容的增加, Junior high school students at the beginning of learning chemistry, due to the rich and colorful teaching content, can be involved in the strong, from the material around the students, through the teacher next to the evidence, enabling students to study the material is full of novelty, coupled with the characteristics of the discipline Of the experimental teaching, the vast majority of students have a high interest in learning chemistry. However, with the increase of learning time, the increase of learning content,