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勒沙特列原理是“化学平衡”一章中的重点和难点,也是高考的热点内容之一,它在今年各地区高考化学试题中都已频频出现。2005年高考化学卷主要从以下几方面考查勒沙特列原理。一、考查平衡移动方向的判断例1(全国理综卷Ⅱ)已知反应A2(g)+2B2(g)(?)2AB2(g)的ΔH<0,下列说法正确的是()A.升高温度,正向反应速率增加,逆向反应速率减小B.升高温度有利于反应速率增加,从而缩短达到平衡的时间
Le Chatelier’s principle is the key and difficult point in the chapter “Chemical Equilibrium,” and it is also one of the hot topics of the college entrance examination. It has frequently appeared in the chemical examination questions for college entrance examinations in various regions this year. In 2005, the college entrance examination chemistry mainly examined the principle of Le Chatelier in the following aspects. First, consider the judgment of the direction of balanced movement Example 1 (National Harmonic Volume II) known reaction A2 (g) + 2B2 (g) (?) 2AB2 (g) ΔH <0, the following statement is correct () A. When the temperature is increased, the forward reaction rate increases and the reverse reaction rate decreases. B. Increasing the temperature favors the increase of the reaction rate, thereby shortening the time to reach equilibrium.