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Ⅰ.从旧课引入新课在检查知识时提问一位同学:“氮气和氢气在什么条件下才能化合?生成物是什么?写出化学方程式。”待学生回答并分析后,在黑板上留下学生所写的化学方程式:N_2+3H_2高温高压催化剂(?)2NH_3然后告诉同学:现在我们来研究氮的氢化物——氨的工业制法,从而引入新课。Ⅱ.通过演示实验讲解化学反应的原理讲课开始时,我先启发学生回忆氯和氢化合,硫和氢化合时所需要的条件,然后便提出这样一个问题:“氯和氢气为什么要这样的条件才能生成氨呢?”这时我便进行如下的分析:“我们知道加热能促进某些物质的反应速度,
Ⅰ. Introducing New Lessons from Old Lessons Ask a classmate when checking knowledge: “Under what conditions can nitrogen and hydrogen be combined? What is the product? Write the chemical equation.” After the students answered and analyzed, they left on the blackboard Under the chemical formula written by the students: N_2 + 3H_2 high temperature and high pressure catalyst (?) 2NH_3 And then tell the students: Now we study the industrial production of nitrogen hydride - ammonia, thus introducing a new lesson. II. Explaining the Principles of Chemical Reactions through Demonstration Experiments At the beginning of the lecture, I first inspired students to recall the conditions required for the combination of chlorine and hydrogen compounds, sulfur and hydrogen, and then asked the question: “Why do chlorine and hydrogen require such conditions Can we generate ammonia? ”At this moment I carry out the following analysis:" We know that heating can speed up the reaction of certain substances,