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化学反应是否到达平衡状态的判断是高考常考的知识点,考查的难度不是很大,但往往有不少学生因为对这部分内容的理解不够透彻,各种条件分析不清,所以判断不准导致失分.笔者根据近年来的教学,对恒容条件下化学平衡状态的判断做了如下梳理,与大家共享.一、化学平衡状态的含义在一定条件下的可逆反应里,当正反应速率与逆反应速率相等时,反应物的浓度与生成物的浓度不再改变,达到一种表面静止的状态,即“化学平衡状态”.二、恒温恒容条件下几种常见化学平衡状态的判断1.不等分子反应【案例】在一定温度下的恒容密闭容器中发生反应:N2(g)+3H2(g)幑幐2NH3(g),下列信息能否说明该反应达到平衡
Whether or not the chemical reaction reaches the equilibrium state is a knowledge point for the college entrance examination, and the difficulty of the examination is not very high. However, many students often have poor understanding of this part of the content, and the various conditions are unclear, so the judgment is not accurate. Lead to loss of points. The author based on the teaching in recent years, the judgment of the state of chemical equilibrium under constant-concentration conditions are summarized as follows, with everyone. First, the meaning of chemical equilibrium in a certain condition of the reversible reaction, when the positive reaction rate When the reaction rate is equal to that of the reverse reaction, the concentration of the reactants and the concentration of the product no longer change, reaching a state of surface static, ie, a “chemical equilibrium state.” Second, several common chemical equilibrium states under constant temperature and constant conditions. Judgment 1. Unequal Molecular Reactions [Case] Reaction occurs in a constant-temperature sealed container at a certain temperature: N2(g)+3H2(g)幑幐2NH3(g). The following information indicates whether the reaction reaches equilibrium.