论文部分内容阅读
一、问题的提出 化学平衡问题是高中化学中的一个难点,现高中化学(选修本)中,有二段文字阐述了可逆反应在同温同压的条件下,物质从不同的起始量开始,分别从正逆反应两个方向达到相同的平衡状态,混合气体里SO_8的(体积)百分含量都是91％。从这个角度出发,1988年及1993年高考化学试题利用下面两道试题考查了这一知识点。
First, the question raised by the question of chemical balance is a difficult point in high school chemistry. In high school chemistry (selected edition), there are two paragraphs that describe the reversible reaction under the same temperature and pressure conditions, starting from different starting materials The same equilibrium state was achieved in both directions of positive and negative reactions, and the volume percentage of SO_8 in the mixed gas was 91%. From this perspective, the 1988 and 1993 college entrance examination chemistry questions examined this knowledge point using the following two questions.