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化学方程式的配平是化学教学中的一个重点和难点,怎样突破它以减轻学生的负担是很值得研究的问题。这里指出的“双方互定系数法”具有以下特点: (1)双方 这是以矛盾论为指导思想而提出的。不论是一种反应物,或多种反应物的化学方程式,都从矛盾对立面双方入手进行配平,一下子解决问题。 (2)互定 根据一方的价数(或变价数)直接确定对方的系数。
The balancing of chemical equations is a key and difficult point in chemistry teaching. How to break through it to reduce the burden on students is a question worth studying. The “bilateral mutual coefficient method” pointed out here has the following characteristics: (1) Both parties This is based on the idea of contradiction. No matter whether it is a reactant or a chemical formula of multiple reactants, the two parties will start balancing the contradictory opposite parties and solve the problem at once. (2) Mutual determination The coefficient of the other party is directly determined based on the price (or the number of changes) of one party.