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关于化学方程式的试题有很多,研究其题型,探讨其解法,无疑是十分有意义的。本文拟从以下几个方面,结合近几年的中考试题,谈谈自己的体会。1 完成化学方程式 根据题目的要求将化学方程式完成.现举几例如下。 例1 配平下列化学方程式(在方框内填上适当的系数): □CO+□Fe_2O_3=□Fe+□CO_2↑ 解析:一般来讲,在具体配平时,都是选用自己比较熟悉的方法,该题配平的化学方程式为 3CO+Fe_2O_3=2Fe+3CO_2↑ 例2 配平下列化学方程式(在方框内填上适当的系数):
There are many questions about the chemical equations. It is undoubtedly significant to study their questions and explore their solutions. This article plans to talk about one’s own experience from the following aspects, combined with the examination questions in recent years. 1 Complete the chemical equation The chemical equation is completed according to the requirements of the topic. Example 1 Balance the following chemical equations (fill in the appropriate coefficients in the box): □CO+□Fe_2O_3=□Fe+□CO_2↑ Analysis: Generally speaking, in the specific trimming, all of them use their own familiar methods. The trimmed chemical equation is 3CO+Fe_2O_3=2Fe+3CO_2↑ Example 2 Balance the following chemical equation (fill in the appropriate coefficients in the box):