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守恒法是中学化学计算中一种很重要的方法与技巧,也是高考试题中应用最多的方法之一,其特点是抓住有关变化的始态和终态,忽略中间过程,利用其中某种不变量建立关系式,从而简化思路,快速解题.一、质量守恒法质量守恒定律表示:参加化学反应的各物质的质量总和,等于反应后生成物的各物质的质量总和.依据该定律和有关情况,可得出下列等式:(1)反应物的质量之和=产物的质量之和.(2)反应物减少的总质量=产物增加的总质量.
Conservation Law is a very important method and skill in middle school chemistry calculation. It is also one of the most used methods in college entrance examination. It is characterized by grasping the initial state and the final state about the change, ignoring the intermediate process, using some of them Variables to establish the relationship, so as to simplify ideas and solve problems quickly.A mass conservation law of mass conservation that: the total mass of each substance participating in the chemical reaction is equal to the sum of the mass of each substance after the reaction product.According to the law and related (1) The sum of the masses of the reactants = The sum of the masses of the products (2) The total mass of the reactants to be reduced = The total mass of the products to be added.