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教材把《氧化还原反应》安排在《开发海水中的卤素资源》一章的第三节中学习,有其重要的意义。因在中学阶段的基本概念、基础理论知识中,《氧化还原反应》占有极其重要的地位,贯穿于中学化学教材的始终,是中学化学教学的重点和难点之一。在中学化学中,凡涉及元素价态变化的反应都是氧化还原反应。只有让学生掌握氧化还原反应的基本概念才能使他们理解这些反应的实质。学生对本节教材掌握的好坏直接影响着其以后对化学的学习。本节教材安排在这里是承前启后、合乎情理。新课改最核心的理念是“促进学生身心和谐发展”。基于此,通过学情分析,我采取的是以促进学生自主发展的思想来设计本节课。
The textbook has the significance of arranging the “redox reaction” in the third section of the chapter “Developing Halogen Resources in Seawater”. Because of the basic concept in the middle school stage, the “redox reaction” occupies an extremely important position in the basic theoretical knowledge. It runs through middle school chemistry teaching materials and is one of the most important and difficult points in the chemistry teaching in middle schools. In middle school chemistry, reactions involving valence changes of elements are redox reactions. Only by allowing students to master the basic concepts of redox reactions can they understand the nature of these reactions. The quality of the students’ mastery of the teaching materials in this section has a direct impact on their subsequent study of chemistry. This section teaching materials arranged here is the last resort, reasonable. The core concept of the new curriculum reform is “to promote the harmonious development of physical and mental health of students.” Based on this, through the analysis of academic situation, what I adopted was to design this lesson based on the idea of promoting students’ independent development.