有一些化学反应无明显现象,也就是说,在化学反应过程中不发光、不变色、无明显的热量变化、无沉淀、无气体生成,导致人们不易判断是否发生了化学反应。可以借助其他试剂和仪器来证明:一、证明参加反应的某种物质没有了或减少了;二、证明生成物的存在;三、创设情境,呈现现象。 Some chemical reactions have no obvious phenomenon, that is to say, no light, no color change, no obvious heat change, no precipitation and no gas generation during the chemical reaction process, which makes it difficult to judge whether a chemical reaction has taken place. You can use other reagents and equipment to prove: First, to prove that participation in the reaction of a substance has not been reduced or reduced; Second, to prove the existence of the resulting product; Third, create the situation, showing the phenomenon.