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“二氧化硫的性质和作用”是高考重要知识点,学习该知识后处理练习时出现了“SO2通入BaCl2溶液中能否反应生成沉淀?”这一问题,查看近几年高考试题也多次涉及该问题,而许多学生对该问题的认识较为模糊,甚至得出错误结论.那么造成学生对该问题模糊不清的原因是什么呢?对该知识点的教学应如何突破?笔者结合对学生的调查及课堂教学实践,对这一问题简要分析并寻求有效的解决策略.一、学生误判原因探析
“The nature and role of sulfur dioxide ” is an important knowledge point of the college entrance examination, learning the knowledge of post-processing exercises appeared “SO2 access to BaCl2 solution can generate precipitation? ” This question, But also many times involved in the problem, and many students have a vague understanding of the problem, or even come to an erroneous conclusion.What causes students to vague about the problem is what? The teaching of the knowledge point should be how to break? Combined with the investigation of students and classroom teaching practice, a brief analysis of this problem and seek effective solutions to the tactics.