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优点:1、从化学反应的分类入手,引出新的分类方法。引发认知冲突;一氧化碳还原三氧化二铁的反应不属于四大基本反应。
2、板书配合讲述,将氧化反应和还原反应的关系阐述的非常清晰。
缺点:知识之间的过渡有些生硬。
优点:
1.从化学反应的分类入手,制造认知冲突:一氧化碳还原三氧化二铁的反应不属于四大基本反应,引出新的分类方法。
2.有突出主题的板书,将氧化反应和还原反应的关系阐述的非常清晰。
3.和同学有适当互动
4.在练习的过程中引导学生发现问题:氧化还原反应不只是得失氧的反应,化合价才是更一般的本质
缺点:知识之间的过渡还需要再优化
优点:1.通过初中所学的四大基本反应类型入手,体现了巩固性原则。
2.语速适中,表达还是很清晰的。
3.板书字迹工整。
缺点:
知识之间的过渡有些不自然
优点:1.和学生互动性较强,主要引导学生进行自主思考,突出学生的主体性;2.思路清晰,通过一步步设置认知冲突,激起学生的学习兴趣;3.运用类比的思想,类比一氧化碳还原氧化铁、氧化铜;4.配合使用简洁的板书
缺点:1.要多关注学生一点;个人认为四大反应可以不作为引入,这样显得引入太过长,可以在后面讲