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使学生在头脑中形成化学概念，掌握化学规律的关键是能够给学生创设一个突出事物本质因素，摒弃非本质因素的化学情境。一个化学实验的全过程，往往对学生构成纷繁的综合刺激，有本质的，也有非本质的。而反映本质联系的化学现象并非都是强刺激，所以，学生不一定能引起注意，
To enable students to form a chemical concept in their minds, the key to mastering the laws of chemistry is to create an essential factor for students to highlight the nature of the phenomenon and to abandon the chemical context of non-essential factors. The whole process of a chemical experiment is often an irritant and comprehensive stimulus for students. It is both essential and non-essential. The chemical phenomena that reflect the essential connections are not all strong stimuli, so students may not be able to attract attention.