一、定性推理思维及其案例分析定性思维是初中生在解化学题目时常用的一种思维模式,它主要是对具有某种属性的对象进行推理分析,这种思维可以解决的就是“有没有”与“是不是”的问题。运用定性推理的思维来解决化学问题,主要是通过实验现象中的颜色、反应和状态等信息,在推理以及分析的过程中对整个事物进行全面的了解与认识,从而在此基础上得到问题的答案。例1.有一种混合气体,它可能由CO_2、CO、H_2、N_2等多种气体组成,为了检验其中的气体成分,可以通过相应的实验来进行探讨:①首先将这种混合气体经过澄清 First, the qualitative reasoning thinking and case analysis Qualitative thinking is a commonly used thinking mode of junior high school students in chemistry topics, it is mainly for reasoning analysis of an object with a certain attribute, this thinking can be solved is No “and ” is not "problem. Using qualitative reasoning to solve chemical problems, we can get a comprehensive understanding and understanding of the whole thing through reasoning and analysis through information such as color, reaction and state in experimental phenomena, answer. Example 1. There is a mixture of gases, which may be CO_2, CO, H_2, N_2 and other gases, in order to test the gas composition which can be discussed through the corresponding experiments: ① First, the mixture was clarified