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本文译自“Higher Grade Chemistry”一书的第六单元。该书系供英国中学高年级学生在学过普通水平的化学以后选修或自学之用。每一单元的内容系针对一专题循序渐进地介绍事实材料或实验数据,采用图、文、表,使抽象的概念形象化、理论具体化。在每一段之后,安排思考题数则,用以加深理解和运用知识,最后概括出结论。每一单元的结尾附有问题解答,以俾自学者及时校对或纠正错误。
This article is translated from the sixth unit of “Higher Grade Chemistry”. This book is for elective or self-study purposes for senior high school students in the UK who have studied ordinary chemistry. The content of each unit is to introduce factual materials or experimental data step by step to a topic, and use graphs, texts, and tables to visualize abstract concepts and theories. After each paragraph, arrange the number of questions to deepen the understanding and use of knowledge, and finally summarize the conclusions. Questions are answered at the end of each unit to help students correct or correct errors in a timely manner.