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据不完全统计,在九年级检测试题中需要应用差量意识作为解题技巧的综合计算题的比例居高不下,有关差量意识的构建始终是大部分学生的学习难点,也是教师教学的重点。为了有效突破这一重难点,在初中化学全年教学中整体构建学生差量意识显得尤为重要。一、科学故事,引出差量在最初进行差量问题的教学时,可利用人教版九年级化学上册~([1])26面“图2-1拉瓦锡”与"图2-2拉
According to incomplete statistics, in the ninth grade test questions need to apply the difference consciousness as a problem solving skills comprehensive calculation of the high proportion of the construction of awareness about the difference is always most of the students learning difficulties, but also the focus of teacher teaching . In order to effectively break through this heavy and difficult point, it is particularly important to construct the overall sense of difference of students in junior high school chemistry year-round teaching. First, the scientific story, leads to the difference in the initial differential teaching, you can use the PEP edition ninth grade chemistry ~ ([1]) 26 surface 2-2 pull