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随着新课程的实施,难度较大的计算题大大减少,但随之出现的计算型选择题层出不穷,为此,笔者结合近年来的高考化学试题,给出几种这些试题的巧解方法,以期对读者有所帮助.一、关系式法关系式法是根据有关反应的化学(离子)方程式或有关物质的化学式,利用反应的相互关系(可通过中介物质)或元素的守恒关系,找出有关物质间的相互关系——关系式,从而利用关系式进行计算.关系式法是求解多步反应计算题的“法宝”.
With the implementation of the new curriculum, the more difficult computational problems are greatly reduced, but the attendant computational choice problems emerge one after another. Therefore, in light of the recent college entrance exam chemistry questions, the author gives some clever solutions to these questions, In order to help the reader.First, the relational law method is based on the relationship between the chemical reaction (ion) equation or the chemical formula, the use of the relationship between the reaction (through the intermediary substances) or the conservation of elements to find out Relationships between substances - relations, and thus use the relationship between the calculation of relational law is to solve the calculation of multi-step reaction “magic weapon.”