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流程问题在中考中占有比较大的分量,难度大,得分率低,如何提高这方面的解题水平呢?笔者在教学过程中对此进行了摸索,现总结如下.一、题型和思想方法1.常见题型:语言表述的实验流程(例1)、气体流程(例2)、框图流程(例3).2.思想方法:不管哪类流程,必须仔细读题,写出每步流程中涉及的所有发生反应的化学方程式,然后对方程式中涉及的每一种物质结合题意进行取舍,最后得到正确答案.
Process problems in the examination occupy a larger component, difficult, low scoring rate, how to improve the problem-solving level in this area? The author in the teaching process of this exploration, are summarized as follows: First, the type and method of thinking 1 common questions: the language of the experimental process (Example 1), the gas flow (Example 2), the block diagram flow (Example 3) .2 way of thinking: no matter what kind of process, you must read the questions carefully, write each step of the process In all involved in the reaction of the chemical equation, and then equation involved in each of the substances combined with the problem to choose, and finally get the correct answer.