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中学化学教学大纲(草案)中规定:“在学生学习化学的过程中,还应该使学生获得熟习各种分子式和化学方程式,能独立地写出简单的分子式和化学方程式,并能运用它们进行计算的技巧。”在几年来的教学过程中,我深深体会到化学方程式和基本化学计算是学习化学的基础和工具之一,但是由于教师的讲解不深不透,初学的学生容易犯下面一些错误: 甲、化学方程式方面: (1)脱离实际,臆造化学方程式。如:
The Draft High School Chemistry Syllabus stipulates: “In students’ learning chemistry, students should also be familiar with various formulas and chemical equations and be able to write simple formulas and equations independently and use them to calculate . ”During the course of several years of teaching, I deeply realized that the chemical equations and basic chemical calculations are one of the foundations and tools for learning chemistry. However, as the teachers’ explanations are not hard to find, beginner students tend to make the following Error: A, chemical equation aspects: (1) from the actual, hypothetical chemical equation. Such as: