一、复习要求1．熟悉常见物质的重要物理性质及反应现象。2．了解物质的检验、鉴别与推断的含义及区别。3．能正确运用所学元素及化合物知识，并根据实验现象对常见物质进行鉴别与推断。二、主要内容小结鉴别就是根据几种物质的不同特性以确认它们各是什么物质；推断是根据已知 First, review requirements 1. Familiar with common physical properties and reaction phenomena. 2. Understand the meanings and differences between testing, identification and inference of substances. 3. It can correctly apply the learned elements and compound knowledge, and identify and infer common substances based on experimental phenomena. Second, the main content Summary Identification is based on the different properties of several substances to confirm what each of them is; Inference is based on known