论文部分内容阅读
限于教学的阶段性,中学化学教材对具体的物质一般只介绍其性质,讲同类物质的性质变化规律,一般未从物质的本质属性方面去揭示物质结构对物质性质的影响。从教学需要的角度出发,下面谈谈我对中学化学教材中几类物质性质的初浅看法。一、无机含氧酸的分子结构决定其酸性的强弱。酸性强弱的标志是解离出 H~+的难易程度。硝酸、硫酸是强酸,磷酸是中强酸,碳酸是弱酸,这结论是大家熟悉的。而这结论是由它们的结构决定的。请看下表:
Confined to the phase of teaching, middle school chemistry textbooks only introduce the nature of specific materials, and talk about the nature of the same substances in the law of nature, generally do not reveal the material structure of the material nature of the material nature of the impact. From the point of view of teaching needs, let’s talk about my first thoughts on the nature of several types of materials in chemistry textbooks for middle schools. First, the molecular structure of inorganic oxygen acids determines the strength of its acidity. The sign of acidity is the difficulty in dissociating H~+. Nitric acid and sulfuric acid are strong acids, phosphoric acid is a medium strong acid, and carbonic acid is a weak acid. This conclusion is familiar to everyone. And this conclusion is determined by their structure. Please see the following table: