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据了解,有不少教师在讲授高中化学课中有关“反应热”的内容时,引用氯酸钾加热分解制氧气的反应做为“吸热反应”的例子;有些教学参考资料也认为:需要供给能量才能进行的反应是吸热反应。因此,有一个需要澄清的问题提到了我们面前:凡加热才能进行的反应,一定就是吸热反应吗? 下面,我们引用几个实例来讨论这一问题,并阐明我们的看法。首先看氯酸钾分解制氧气的反应:
It is understood that many teachers in the teaching of “reaction fever” in the high school chemistry class cited the reaction of potassium chlorate heating to decompose oxygen as an example of an “endothermic reaction”; some teaching references also believe that energy needs to be supplied. The only reaction that can be carried out is an endothermic reaction. Therefore, there is a question that needs clarification mentioning before us: Any reaction that can be carried out by heating must be an endothermic reaction. Below, we cite several examples to discuss this issue and clarify our views. First look at the reaction of potassium chlorate decomposition to oxygen: