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第四课什么是燃烧燃烧的条件一、本课目的:使学生知道燃烧的意义,并使学生了解温度和空气中的氧在可燃性物质燃烧时所起的作用。二、检查学生知识:(1)在自然界分布最广的是哪种碳酸盐?(2)一氧化碳有什么主要用途?(3)哪类反应叫化合反应?那类反应叫分解反应?(4)碳和硫各在氧中燃烧有什么相似现象(生光和热)?生成什么物质(氧化物)? 三、讲新课: 1.教师结合上面的提高,叫学生回想氧气性
Lesson 4 What is a burning and burning condition? Aim of this lesson: To enable students to know the meaning of burning and to make students aware of the role of temperature and oxygen in the air during the burning of flammable substances. Second, check the student knowledge: (1) what kind of carbonate is most widely distributed in nature? (2) What are the main uses of carbon monoxide? (3) What kind of reaction is called compound reaction? What kind of reaction is called decomposition? What are the similarities (light and heat) of carbon and sulfur burning in oxygen? What are the substances (oxides)? Third, to talk about new lessons: 1. Teachers combined with the above improvement, asking students to recall oxygen