先学后教,以学定教。能够有效地促进学生学习能力的提高。在学习新知识之前,教师引导学生有针对性的预习从而帮助学生为上课作一定的准备,包括复习与所学内容相关的知识,为学习新知做好铺垫;为学习新知搜集相关的素材,降低学习新知的难度;读指定的参考书,对教材中的新知识进行预习。在化学学习过程中,根据教师事先拟定的学习目标对即将学习的新知识进行预先自学教材的学习活动。有效的预习能够培养学生的自主学习能力,提高课堂学习的效率。一、明确预习的重要性,提高预习的效率提高课堂学习的有效性涉及到的元素很多,不少教师 After the first education, to learn to teach. Can effectively improve the learning ability of students. Before learning new knowledge, teachers guide students to make targeted preparation so as to help students prepare for the class, including reviewing the knowledge related to what they have learned so as to pave the way for learning new knowledge. To collect relevant materials for learning new knowledge and reduce Learn the difficulty of new knowledge; read the designated reference book, the new knowledge in the textbook preview. In the process of chemistry learning, learning activities of pre-self-learning materials are put forward on the new knowledge about to be learned according to the learning objectives formulated by the teachers in advance. Effective preview can cultivate students’ autonomous learning ability and improve the efficiency of classroom learning. First, the importance of a clear preview, improve the efficiency of preview Improve the effectiveness of classroom learning involves many elements, many teachers