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1、新课标鲁教版初中化学物质组成的表示精品教案附件4 大集备学案示例第三单元 我们周围的空气 第二节 物质组成的表示（第三课时）学习要求1.学会利用相对原子质量、相对分子质量进行物质组成的简单计算。2.能根据化学式进行各元素质量比的简单计算。3.能根据化学式进行某元素的质量分数的简单计算。学案设计问题思考1二氧化硫的化学式SO2有哪些含义？2原子是很小的微粒，但仍有一定质量。国际上统一采用 来表示原子的质量。3若已知S、O的相对原子质量（S32 O16），根据化学式可以进行哪些计算？形成知识：根据化学式可以进行三种计算一、计算物质的相对分子质量 解：SO2的相对分子质量= 【练一练】求下列物质的相
2、对分子质量：（H1 C12 O16 Na23）H2O CO2 NaOH 形成知识物质的相对分子质量= 之和。变式训练 求下列物质的相对分子质量：（H1 C12 N14 O16 S32 Ca40）Ca（OH）2 4H2SO4 二、计算组成化合物中各元素的质量比解：在SO2中S：O= 练一练求下列物质中各元素的质量比H2O中 CO2中 Ca（OH）2中 形成知识化合物中各元素质量比= 之比变式训练 NH4HCO3中 NH4NO3中 三、计算物质中某元素的质量分数解：SO2中S= 练一练求下列物质中某元素的质量分数SO2中O= CO（NH2）2中N= 形成知识某元素质量分数 100%变式训练 求NH
3、4NO3中氮元素的质量分数 80kgNH4NO3中含氮元素多少kg？ 课后练习1.水垢中含有碳酸钙，其化学式为CaCO3。求：（1）碳酸钙的相对分子质量（2）碳酸钙中各元素的质量比（3）碳酸钙中氧元素的质量分数（4）0.5g碳酸钙中含钙元素多少g？硝酸铵（NH4NO3）净重：75kg含氮量：34.3%某化学工业公司2.某同学发现她家的菜园中的蔬菜生长迟缓，便施用了一种氮肥，右图是氮肥包装标签的部分文字。根据图示，计算：(1) 硝酸铵的相对分子质量(2) 硝酸铵中各元素的质量比(3) 氮元素的质量分数(4)75kg硝酸铵中氮元素的质量(5) 多少kg硝酸铵中氮元素的质量为56kg(6) 该化肥中
4、硝酸铵的质量分数 （硝酸铵的纯度） (7)一袋该化肥中含有氮元素的质量是多少？碳酸氢铵(碳铵)净重：50 kg含氮量：16O3.林晓到外婆家去作客，见外公购回一袋碳铵(化学式是NH4HCO3)化肥，印在包装袋上的部分说明如下图所示，对此，林晓有许多问题要探究：探究的问题解答这包化肥至少含有多少千克氮元素？结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而努力！164o9aclhm6bgaqnygqgg6.dtyyhtxurqehutwp9x67hgcc3mmmiwm1ljtw.bjivh8.fu4xkyp5zagkht,sq.dtx2he39s9
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