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在化学教学中,除了准确生动地传授知识外,选用适当的解题方法,对于开拓学生思维,培养分析问题、解决问题的能力也大有裨益。笔者在教学实践中,探讨了几种解题方法,收到了一定效果。现书写出来,以取得同行的赐教。一、硝酸盐分解的化学方程式配平的“全氮法” 在硝酸盐分解的教学中,如何配平化学方程式是学生感到困难的地方,笔者在引导学生分析反应规律后,提出“全氨法”配平。因为硝酸盐分解反应中,氮元素的原子全部参与氧化-还原反应,由+5价变为
In chemistry teaching, besides imparting knowledge accurately and vividly, choosing the appropriate problem-solving method is also helpful for developing students’ thinking, cultivating and analyzing problems and solving problems. In the teaching practice, the writer explored several problem solving methods and received certain results. It is now written out to obtain the instructions of its counterparts. First, the decomposition of the chemical equation of nitrate decomposition of the “total nitrogen method” in the decomposition of nitrate in the teaching of how to balance the chemical equation is where students feel difficult, the author guide students in the analysis of the law of response, proposed “ ammonia Act ”balance. Because of the nitrate decomposition reaction, the atoms of nitrogen are all involved in the oxidation-reduction reaction and change from +5 to valence