化学:人教版九年级 化学式与化合价教案
County continuation records has examined and approved the draft, spirit, believe, comprehen求知欲望很强。但最基本的元素、原子团化合价的记忆却又是那么枯燥乏味,因此,教师要充分发挥学生的主观能动性,以试编口诀、讨论交流、活动探究等多种形式活跃课堂气氛,提高教学的效率。
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work- 4 -
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
【教学重、难点】
重点:化合价知识及其应用、有关相对分子质量的计算。
难点:1.化合价的理解及应用。
2.物质中某元素质量分数的计算。
【教学准备】
有关投影片;
将教材P,9图4—11、P。。表4—6放大后复印。
【课时建议】3课时
【教学过程】 (第一课时)
教学流程
教师活动
学生活动
设计意图
创 引
设 入
(投影)
读读、写写、比比:请同学们读出下列元素符号的名称:H、O、C,并试着组合成熟悉的一些物质的符号,比比谁写得最多、最快。引出化学式的概念。
读完后在纸上练****书写:
H2、O2、C、H2O、CO2,甚至有的学生能写出
在学生已有知识的基础上,培养学生的动脑、动手能力,活跃气氛,激发兴趣。
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work- 4 -
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
情 课
境 题
H2O2、CO。
讨
论
交
流
(思考)
纯净物的组成都是固定的,那么,表示每种纯净物组成的化学式可能有几个?
猜一猜;
想一想;
议一议。
从中意识到正确书写化学式的重要性。
County continuation records has examined and approved the draf
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