当物质之间发生化学反应时,其实质就是原子之间的化分和化合,即可推知某种元素的原子无论是在哪种物质中,反应前后其质量及物质的量都不会改变。在氧化还原反应中,氧化剂得电子总数和还原剂失电子总数相等,即得失电子守恒;氧化还原反应的特征是化合价升降相等。用得失电子守恒法解题非常方便,在中学化学中应用非常广泛,在解题时,只要搞清氧化剂变成还原产物,还原剂变成氧化 When a chemical reaction occurs between substances, the essence is the chemical reaction and atomization between atoms. It can be inferred that no matter what kind of substance the atom of a certain element is in, the quality and the amount of substance before and after the reaction will not change. In the redox reaction, the total amount of electrons in the oxidant is equal to the total number of electrons lost in the reductant, ie, the electrons are conserved. The oxidation-reduction reaction is characterized by the equalization of valence. With the loss of electron conservation law is very convenient solution, is widely used in high school chemistry, in solving problems, as long as the oxidant into the reduction of the product, reducing agent into oxidation