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人教版《第二单元 我们周围的空气》教师用书

作者:czhxzx  人气: 1042 次  时间:2011年09月12日  星级:

本单元说明本单元是学生学习的第一大类物质。空气是人人都离不开的物质,由于看不见,摸不着,学生只知其重要,却又不十分清楚空气到底是什么。本单元选择空气和氧作为初中化学中接触具体物质知识的开端,不仅因为小学自然课中对空气和氧气的知识已有过介绍,如空气占有体积、有质量、形成大气压、空气流动就形成风等;更重要的是因为它们在自然界分布极广、是自然界维持生态平衡的重要条件、是化工生产的廉价资源;它与人类的生活关系最为密切,是人类须臾不可离开的天然物质;还因为氧气是化学性质比较活泼的元素,它能与多种金属和非金属元素化合形成氧化物或含氧化合物。通过对它们的认识和了解,可以比较顺利地引导学生进入化学世界来探索物质的奥秘。
选择以空气为题,开始这一单元的教学活动,是符合“从学生熟悉的事物入手,进行科学教育”的原则的。
化学研究的物质多数是纯净物,即使是混合物,一般也应分离出纯净物进行研究,在初学化学的阶段,给学生物质分类的知识是很有必要的。因此本单元中还有关于物质分类的一些知识,主要是混合物和纯净物的知识。
关于化学反应的一些初步知识,可以增强学生对化学科学的认识,也可以帮助学生从本质上认识物质。因此本单元结合氧气的性质和制取,介绍了化学反应的初步概念,还介绍了两类最基本的化学反应──化合反应与分解反应。
通过氧气的性质和制取等实验,不仅可以培养学生的观察能力、分析能力,而且学生还能在实验活动的..................

 

 

 

 

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