论文部分内容阅读
原电池的化学原理是高中课本第二册第一章《电解质溶液》的教学重点之一,也是教学的难点。在教学实践中,我们对高二课本中实验1—3原电池的装置做了较大改进,制作了“原电池化学原理”实验教具。改进后的原电池实验装置如右图。与课本原实验装置比较,新增加一个“对比装置”。同时把“插入式”改为“固定式”只在外电路中增加一个开关K。实验过程:一、1.A烧杯中装80ml2N稀硫酸。B烧杯中装80ml蒸馏水。将分别装有铜片和锌片的木板平放在烧杯上,使铜片和锌片大部分浸入溶液中。(此时开关K_A、K_B均未闭合)〔观察〕A烧杯中:锌片上不断逸出气泡,铜片上没有气泡生成。电流计G1指针不发生偏转。B烧杯中:锌片和铜片上均没有气泡产生。
The chemistry of the primary battery is one of the teaching focuses of the first chapter of Electrolyte Solution in the second volume of high school textbooks, and it is also a difficult teaching task. In the teaching practice, we made major improvements to the 1-3 primary battery device in the second grade textbook, and produced the “primary battery chemistry principle” experimental teaching aid. The improved galvanic cell experimental device is shown on the right. Compared with the original experimental device of the textbook, a new “contrast device” was added. At the same time, “inserted” was changed to “fixed” and only one switch K was added to the external circuit. Experimental procedure: 1. A beaker filled with 80 ml of 2N dilute sulfuric acid. B beaker contains 80ml distilled water. The plates containing the copper and zinc sheets, respectively, are laid flat on a beaker so that most of the copper and zinc sheets are immersed in the solution. (In this case, the switches K_A and K_B are all not closed.) [Observation] A. In the beaker: bubbles are continuously escaping from the zinc sheet, and no bubbles are formed on the copper sheet. Current meter G1 hands do not deflect. B. In the beaker: No bubbles were formed on the zinc sheet and the copper sheet.