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一、问题分析近几年中考对学生化学计算能力的考查要求越来越高,尤其是实验中的有关计算。部分学生不能正确解答实验中的计算题而失分太多,主要原因是学生将化学计算与数学计算混淆。实际上,化学实验中的计算并不是考查学生纯粹的数学计算,主要是考查学生对化学基本概念、化学原理和化学定律的具体运用和对物质间相互反应规律及定律关系的理解和应用。解题时将化学式中的有关计算、质量守恒定律及化学方程式中的有关
First, the problem analysis In recent years, mid-term examinations of students’ ability to calculate the ability of chemical calculation higher and higher, especially in the experiment of the relevant calculations. Some students fail to correctly solve the computational problems in the experiment but lose too much. The main reason is that students confuse chemical calculation with mathematical calculation. In fact, the calculation in chemical experiment is not to examine students ’pure mathematical calculation, mainly to examine the students’ understanding and application of the basic concepts of chemistry, the specific application of chemical principles and chemical laws, and the laws and laws of the interaction between substances. Problem-solving chemical formula of the calculation, the law of conservation of mass and the chemical equation