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对于某些较复杂的或氧化数不能确定的化学方程式,配平往往较困难。为此,本文介绍一种配平化学方程式的新方法——半反应法。对任何一个化学反应,用我们已有的化学知识,都可以将其分成两个半反应。分别配平每个半反应,然后加在一起就可以得到一个正确的化学反应计量方程式。在分第一个半反应时,要根据产物(或反应物)中包含的元素(不考虑氢、氧两元素),找出对应的反应物(或产物)。剩下的其它物质就组成另一个半反应(一种物质在两个半反应中可同时出现)。如反应 FeS_2+HNO_3→Fe_2(SO_4)_3+NO+H_2SO_4应用已有的化学知识,我们知道产物
For some of the more complicated or impossible to determine the oxidation of the chemical equation, trim is often more difficult. To this end, this article describes a new method of trimming the chemical equation - the semi-reaction method. Any chemical reaction can be divided into two half reactions using our existing chemical knowledge. Each half-reaction is trimmed separately and then added together to obtain a correct chemical reaction measurement equation. In the first half of the reaction, the corresponding reactants (or products) are identified based on the elements contained in the product (or reactant) (not considering hydrogen and oxygen). The remaining other substances form the other half of the reaction (a substance can appear simultaneously in both half reactions). If the reaction FeS_2+HNO_3→Fe_2(SO_4)_3+NO+H_2SO_4 applies the existing chemical knowledge, we know the product