概念的外延指概念的适用对象、范围等。有些概念学生容易混淆 ,是由于没有分清概念的外延而引起 ,有些概念师生都感到混乱 ,往往是由于概念的外延太大或太小所致。现通过中学化学中几个易混淆、易引起混乱的概念 ,予以分析、说明。一、元素初中化学给“元素”概念下的定义 ,外? The extension of the concept refers to the applicable object, scope, etc. of the concept. Some concept students are apt to be confused because they are not caused by the differentiation of the concept. Some teachers and students are confused because they are often too large or too small. The concept of confusion and confusion in middle school chemistry is now analyzed and explained. First, the element of junior high school chemistry to the definition of “elements”, outside?