把化学反应放在天平两端托盘上的烧杯中进行,增加了化学计算的实验性和动态性;增加了思维的灵活性,有利于培养同学们的创新思维。此类问题的本质是烧杯中的化学变化,反应前后“差量相等”。常见的思考模式:(1)等量加等量减等量天平平衡;(2)等量加不等量,差量相等天平平衡。 The chemical reaction is placed in a beaker on the trays at both ends of the balance, which increases the experimental and dynamic nature of the chemical calculation; it increases the flexibility of thinking and helps cultivate the students’ innovative thinking. The essence of this kind of problem is the chemical change in the beaker. The difference is equal before and after the reaction. Common thinking modes: (1) Equal balance equal balance minus equal balance balance; (2) Equal amount plus unequal amount balance equal balance balance.