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碱金属的教学对于促使学生认识具体物質如食鹽、苛性钠、苏打等工业原料及巩固加深对周期律,原子结构学说,电离理论的认识是有极重大的意义。因此,当我教完本课题之后,紧接着有一堂复习课。同学们反映:“我们通过这次复习果,不仅明确本课题的具体要求及学习重点,而且掌握了学习方法”。下面谈谈复习课进行的情况及点滴体验: 一、复习课的进行 (1)教师利用元素周期表进行引导性的谈话,说明碱金属在周期表中的位置及包括哪些元素,并指出我们重点学习Na,K的原因。接着就问:我们常将金属钠,钾保存在石油中,为什么?(演示实物),追问:它们的化学性谁较活动呢?试举实例。并要求学
The teaching of alkali metals is of great significance to help students understand industrial materials such as salt, caustic soda and soda and to consolidate and deepen their understanding of the periodic law, atomic structure theory and ionization theory. Therefore, after I finished teaching this topic, there was a review class. The students said: “Through this review, we not only clarified the specific requirements and learning priorities of this topic, but also mastered the learning methods.” Here to talk about the review of the situation and drip experience: First, review the course (1) Teachers use the periodic table to guide the conversation, indicating the position of the alkali metal in the periodic table and include what elements, and pointed out that our focus Learn Na, K reasons. Then I asked: We often sodium metal potassium stored in oil, why? (Demonstration of physical), ask: their chemical who more activities? Cite an example. And asked to learn