课堂教学是教学活动的主战场,而学生是教师主导下的课堂活动的主体,这已不容质疑。建构主义认为:把学生置于真实意义的问题情境中,贴近学生的日常生活和社会生活实际,注意从学生已有的经验出发,让他们在熟悉的生活背景中感受、体会、学习,这样才能使学习更为有效。一、运用化学实验,创设真实情境化学是一门以实验为基础的自然科学,化学教学离不开实验。创设良好的情境,可以抓住全体学生的注意力,使课堂气氛活跃,师生关系和谐,学生求知欲旺盛,其过程直观、富有启发性。尤其对初三学生来说,他们刚刚接触化学知识领域,相关内容是否吸引他们、是否引起他们的共鸣、是否让他们有认同感,是非常重要的, Classroom teaching is the main battlefield of teaching activities, and students are the main body of classroom activities under the guidance of teachers. There is no doubt about it. Constructivism holds that students should be placed in the real situation of the problem, close to the students ’daily life and the actual social life, and pay attention to learning from the students’ existing experiences so that they can feel, experience and learn in the familiar life background Make learning more effective. First, the use of chemical experiments, the creation of the real situation Chemistry is an experiment based on the natural sciences, chemistry teaching can not be separated from the experiment. Create a good situation, you can seize the attention of all students, so that the classroom atmosphere of active, harmonious relationship between teachers and students, students thirst for knowledge, the process intuitive and inspiring. In particular, it is very important for the first three days of junior high school students who have just come into contact with the field of chemical knowledge and whether the relevant content attracts them and whether they resonate with or empower them.