演示实验──过渡元素的一连串反应黄佩丽（北京师范大学化学系１００８７５）过渡元素是多变价元素，颜色绚丽多彩，反应变化多端，且常伴随着明显的外部特征。如颜色的变化、沉淀的生成、溶解、再沉淀等等。其中包含着许多基本原理。在教学中，巧妙地将这些有趣多变的化... Demonstration experiment - a series of reactions of transition elements Huang Peili (Department of Chemistry, Beijing Normal University 100875) Transitional elements are multivariate elements, with colorful and colorful colors, various responses and often accompanied by obvious external features. Such as color changes, the formation of precipitation, dissolution, re-precipitation and so on. There are many basic principles involved. In teaching, cleverly these interesting and changeable ...