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氧化—还原反应是高中化学的重要知识点,也是近几年高考的热点,它侧重于考查对该概念的理解和综合应用能力。以下从此内容的命题角度对其知识要点作些归纳、分析。一、考查氧化—还原反应的特征、实质氧化—还原反应的特征是反应前后有元素的化合价升降,其实质是反应前后有电子的得失。以此可判断一个化学反应是否属氧化—还原反应。例1.(84年高考题)下列属于氧化—还原反应的是( )
Oxidation-reduction reaction is an important knowledge of high school chemistry, and is also a hot spot of the college entrance examination in recent years. It focuses on the understanding of the concept and comprehensive application capabilities. The following summarizes and analyzes the key points of this knowledge from the propositional perspective of this content. First, to examine the characteristics of oxidation-reduction reactions, and the characteristics of substantial oxidation-reduction reactions are that the valences of the elements before and after the reaction go up and down. The essence of this is the gain and loss of electrons before and after the reaction. This can determine whether a chemical reaction is an oxidation-reduction reaction. Example 1. (84-year college entrance examination question) The following are oxidation-reduction reactions ()