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现行初中化学新教材中质量守恒定律的演示〔实验４－２〕，我们发现在烧杯中倾倒混和液时，不慎洒出，就会使实验失败。为解决上述问题，我们将此实验进行了改进。图１ 演示质量守恒装置１ 实验装置实验装置如图１所示。其中带磨口的锥形瓶容量２５０ｍＬ。２ 实验操作ａ．
In the current demonstration of the law of conservation of mass in the new textbook for junior middle school chemistry (Experiment 4-2), we found that accidentally spilling the mixture in a beaker could cause the experiment to fail. To solve the above problem, we have improved this experiment. Figure 1 shows the mass conservation device 1 experimental device experimental device shown in Figure 1. One of the conical flasks with ground mouth capacity 250mL. 2 experimental operation a.