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守恒思想是解决初中化学问题的一种极其重要的方法和技巧.运用守恒思想,关键是抓住有关化学变化的始态与终态,不需要纠缠变化过程的细节,利用其中某种不变的量建立关系式,从而简化思路,快速解题.化学反应的实质是原子之间的重新组合,反应前后组成物质的原子个数保持不变,即化学反应中反应物总质量等于生成物总质量,这就是质量守恒定律.在化学反应中,因为同种元素
The idea of conservation is an extremely important method and skill to solve the problem of junior high school chemistry. The key to using the idea of conservation is to grasp the beginning and end of the chemical change without the need to entangle the details of the process of change and make use of one of the immutable Quantity to establish the relationship, so as to simplify ideas, rapid problem-solving.The essence of chemical reaction is the recombination between atoms, the number of atoms before and after the reaction remains unchanged, that is, the total mass of reactants in the chemical reaction is equal to the total mass of the product This is the law of conservation of mass, because of the same kind of element in a chemical reaction