学生是获取知识过程的主动参与者,学习是学生主动建构知识结构的过程。在学习过程中,学生对外部信息应主动地选择、加工和处理,从而建立新的知识结构。《义务教育化学课程标准》的教学理念大力提倡探究性学习,就是培养学生分析问题、解决问题以及发现、提出问题的能力。这就要求教师在教学过程中必须把学生学习的内容巧妙地转化为问题情境。一、设置新课引入问题情境,激发学生学习的兴趣 Students are active participants in the process of acquiring knowledge. Learning is the process by which students construct the knowledge structure initiatively. In the learning process, students should take the initiative to select, process and process external information to establish a new knowledge structure. “Compulsory education chemistry curriculum standards” teaching philosophy to promote inquiry learning vigorously is to train students to analyze, solve problems and find, ask questions. This requires that teachers in the teaching process must be cleverly translated into the content of student learning problem situations. First, set the new lesson into the problem situation, to stimulate student interest in learning