论文部分内容阅读
高中化学(甲种本)第一册第24页和高中化学(乙种本)上册第18页都有“卤素各单质的活动性比较”的两个演示实验,用来说明氯能置换溴和碘及溴能置换碘。这两个实验操作并不复杂,效果一般也较明显,但教师必须在课前预备好新制的氯水和溴水,否则实验效果就有问题;同时,由于溴和碘在水中的溶解度
The two high-level demonstrations of the “activity comparison of halogen elements” used in the High School Chemistry (Volume One) Page 24 of the first volume and the High School Chemistry (Grade B) on the 18th page are used to demonstrate that the chlorine can replace the bromine and Iodine and bromine can replace iodine. The two experimental operations are not complicated and the effect is generally obvious. However, teachers must prepare new chlorine and bromine water before class, otherwise the experimental results will be problematic; at the same time, due to the solubility of bromine and iodine in water.