基于证据推理的电化学综合实验探究

盐桥的作用众所周知,如果“将铜锌双液原电池的盐桥换成铜片后,电路中还有电流吗？两液中的铜片到底发生了什么反应？”,基于这些问题,开发了一系列实验,利用观察到的各种证据,如:生成的沉淀、溶液颜色的变化、电极质量的改变、溶液pH和电流计指针偏转方向等,引导学生对各个电极变化的反应进行假设,并设计新颖实验逐步探究证实,依据宏观实验现象的证据,开展问题驱动式学习,以此培育学生的科学探究与创新意识。

Electrochemical Comprehensive Experiment Inquiry Based on Evidence Reasoning

The role of the salt bridge is well known. If "the salt bridge of the copper-zinc two-liquid primary battery is replaced by a copper piece, is there any current in the circuit? What are the reactions of the copper piece in the two liquids?", based on these questions, a series of experiments have been developed to guide students to make assumptions about the reactions of each electrode using various evidences such as precipitate formation, color change of the solution, changes of electrode mass, pH of the solution, and directions of deflection of the galvanometer pointers. During the research, students also need to design novel experiments to gradually find the evidences, based on the evidences of macroscopic experimental phenomena, this paper carries out problem-driven learning to cultivate students’ core literacy of scientific inquiry and innovation consciousness.