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化学计算题除按常规解法外,还可根据题目的特点,在基本概念清晰的情况下进行技巧计算,这样不但可以使解题步骤或数字运算大为简化,还可以培养学生分析解决问题的能力,化学计算题里有时出现多余数据,通常有以下四种情况。1 对题意不起任何作用,纯属多余条件 例1.实验室中,用氢气还原氧化铜m克,当大部分固体变红色时,停止加热,冷却后称得残留固体质量为n克,共用去氢气w克,问此时生成水多少克?
In addition to conventional calculation methods, chemical calculation questions can also be calculated based on the characteristics of the questions in the case of clear basic concepts. This will not only simplify problem solving procedures or numerical calculations, but also develop students’ ability to analyze and solve problems. There are sometimes redundant data in chemical calculations. There are usually four situations. 1 No effect on the meaning of the question, purely redundant conditions Example 1. In the laboratory, the reduction of copper oxide mg with hydrogen, when most solids turn red, heating is stopped, and the mass of residual solid after cooling is ng. To share the hydrogen w grams, ask how much water is generated at this time?