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一、含义参加化学反应的各物质的质量总和,等于反应后生成的各物质的质量总和.二、实质质量守恒定律可理解为“五个不变”、“两个一定改变”和“两个可能改变”.1.五个不变宏观:①参加反应的各物质的质量和等于生成物的各物质的质量和;②化学反应前后元素种类和元素质量保持不变.微观:①化学反应前后各原子的种类不变;②化学反应前后各原子的数目不变;③化学反应前后各原子的质量不变.2.两个一定改变宏观:化学反应前后物质的种类一定改变.微观:
First, the meaning Participate in the chemical reaction of the total mass of each substance, equal to the total mass of each substance generated after the reaction. Second, the law of conservation of mass, can be understood as “five unchanged”, “two must change” And “two possible changes.” 1. Five unchanging macroscopically: ① The mass of each substance participating in the reaction and the mass of each substance equal to the product; ② The types and quality of the elements before and after the chemical reaction remain the same. Micro: ① the type of atoms before and after the chemical reaction unchanged; ② the number of atoms before and after the chemical reaction unchanged; ③ before and after the chemical reaction of the mass of the same atom .2 two must change the macro: certain types of chemical substances before and after certain Change: Micro: