高中化学教学中常常会用到守恒法来解题。守恒定律是指:参加化学反应的物质,反应物和生成物的总质量,物质中的每一种原子总数,化合价的升降总数,各种微粒所带的电荷总和等都必须保持不变。运用守恒定律,只要考虑化学反应前后某一部分化学或者物理量的始态和终态,不用考虑细节,可以简化数学计算,降低解题难度,加快解题速度,提高解题准确率。在化学中存在着多种守恒,比如质量守恒、电子守恒、元素守恒、电荷守恒、原子守恒等等。因此,解题时可以依据守恒 High school chemistry teaching often use conservation law to solve problems. The law of conservation means that the total mass of reactants and products, the total number of each atom in the material, the total number of valences, the sum of charges carried by the various particles, etc. must all remain constant. Using the conservation law, as long as the beginning and end of a chemical or physical part of a chemical reaction before and after the chemical reaction is considered, regardless of the details, mathematical calculations can be simplified, the difficulty of solving problems can be reduced, the speed of solving problems can be speeded up, and the accuracy of solving problems can be improved. There are many kinds of conservation in chemistry, such as conservation of mass, conservation of electrons, conservation of elements, conservation of charge, conservation of atoms and more. Therefore, the problem-solving can be based on conservation