化合价是初中化学学习中的难点,这是大家公认的事实。那么,化合价的知识到底难学在哪里?如何理解化合价的概念?基于个体的认识过程以必然的形式重演人类的认识过程,下面我们通过对化合价概念的历史演变分析,探讨化合价的学习难点,并提出解决化合价学习困难的教学策略。一、化合价概念的历史演变化合价概念从提出到现在,已经 Valence is the difficulty of junior high school chemistry learning, which is generally acknowledged fact. How to understand the concept of valence? The process of individual-based cognition replays human cognition in a necessary form. Here we discuss the difficulty of learning valence by analyzing the historical evolution of valence Put forward teaching strategies to solve the problem of valence price learning difficulties. First, the valence of the historical evolution of the concept of valence from the proposed to the present, already