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课堂练习是化学课堂教学的重要组成部分,是教师在完成某一教学环节后,为使学生掌握知识、应用知识,形成技能、技巧,培养能力而实施的一种有效的方法。课堂练习有别于课后作业和平常考试,它不仅要体现课程教学的目的、要求,突出教学内容的重、难点,并且需要顾及学生的接受能力以及时间的多少。因此在课堂练习的选题方面,需要教师认真钻研教学大纲,准确理解大纲规定的知识、
Classroom practice is an important part of chemistry classroom teaching. It is an effective method for teachers to implement knowledge, apply knowledge, form skills, skills and cultivate ability after completing a certain teaching process. Classroom exercises are different from homework assignments and routine examinations. They not only reflect the purpose and requirements of course teaching, but also emphasize the heavy and difficult points of teaching contents. They also need to take into account the acceptability of students and how much time they spend. Therefore, in the classroom exercises topics, teachers need to seriously study the syllabus, an accurate understanding of the outline of the knowledge,