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本章的演示实验,着重说明分解、化合、置换等三种化学反应,并通过演示树立学生对“原子”、“单质”、“化台的”、“元素”的概念。因此在给学生分析每个演示时,都应把原子、单质、化合物等名词和具体演示的物质联系起来。例如通过氧化汞分解的演示应联系地指出:“汞由同种微粒——汞原子——组成;氧由同种微粒——氧原子——组成;但氧原子和汞原子不同,汞原子和氧原子是不同种类的原子。”接着可以指出:“氧化汞由不同种类的原子组成(氧原子和汞原子),而氧分子是由同种原
The demonstration experiment in this chapter focuses on three chemical reactions such as decomposition, compounding and substitution, and through the demonstration, students establish the concept of “atom”, “elemental substance”, “transformational element” and “elemental element.” Therefore, when analyzing each demonstration for students, we should associate the nouns such as atoms, simple elements and compounds with concrete demonstration materials. For example, a demonstration by decomposition of mercury oxide should be noted that “mercury consists of the same kind of particles - the mercury atoms - and the oxygen consists of the same kind of particles - the oxygen atoms - but the oxygen and mercury atoms are different and the mercury atoms and Oxygen atoms are different kinds of atoms. ”It can then be pointed out:" Mercury oxide consists of different kinds of atoms (oxygen atoms and mercury atoms), whereas oxygen molecules are made from the same species