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1、名师精编优秀教案4.1.1 常见的金属材料【学习目标】1、通过日常生活中广泛使用金属材料等具体事例,认识金属材料与人类生活和社会发展的密切关系。2、了解常见金属的物理性质,知道物质的性质在很大程度上决定了物质的用途,但同时还需考虑如价格、资源以及废料是否易于回收等其他因素。3、认识在金属中加热熔合某些金属或非金属可以制得合金,知道生铁和钢等重要合金,以及合金比纯金属具有更广泛的用途。【学习重点】1、引导自主探究金属的物理性质。2、在交流学习中认识常见的合金并了解其广泛的用途。【学习方法】引导实验探究;指导调查考察,收集资料整理归纳;组织小组讨论交流及分享等。【仪器、药品及其它】1、学生收集日常
2、生活中的金属材料。2、学生查阅有关金属材料发展前景资料。3、酒精灯、火柴、干电池、导线、小灯泡、砂纸、铜丝、铁丝、铝丝、铁架台、黄铜、铜、焊锡、锡、铁片、铅、铝片、铝合金。4、教师制作多媒体课件。【学习过程】【引入】以图片的形式引入,鸟巢是由什么材料制成的?从青铜器到铁器到铝制品材料的应用,引入今天的课题。活动一:金属的物理性质:【提问】你们知道的,见过的金属元素有哪些呢?请完成下表。我知道的金属名称元素符号我见过的金属名称名师精编优秀教案元素符号【交流展示】请学生列举身边的金属材料【图片展示】投影展示图片:应用广泛的金属材料。【提问】金属有哪些物理性质呢?先回忆物理性质指的是物质哪些方面的性
3、质。【讨论归纳】出示一些金属物理性质数据。【讨论问题】1、为 什么菜刀、镰刀、锤子等用铁制而不用铅制?2、银的导电性比铜好,为什么电线一般用铜制而不用银制?3、为什么灯泡里的灯丝用钨制而不用锡制?如果用锡制的话,可能会出现什么情况?4、为什么有的铁制品如水龙头等要镀铬?如果镀金怎么样?5、为什么现在高压电线用铝丝而不用铜丝了?【联想应用】科学家发现了一种新金属,它的一些性质如下:熔点2500;密度 3 g/cm3;强度与钢相 似;导电性良好;导热性良好;抗腐蚀性优异这种金属的表面有一层氧化物保护层,试设想这种金属的可能用途。【趣味活动】在我们的人体中有一个“金属之最”,你们知道吗?你知道地壳中
4、的“金属之最”吗?你还知道哪些“金属之最”?活动二:合金【提问引入】出示生活中常见的铝合金图片,提问你知道它们由什么材料制成的?我们生活中常见的金属材料都是纯金属吗?引入合金概念。【比较】为什么我们在生活中不用纯铝做门窗,而是用铝合金?为什么不用纯铁制作汤勺,而文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X1
5、0H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3
6、Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ
7、8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R1
8、0C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:
9、CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U
10、9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 Z
11、M8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6名师精编优秀教案用不锈钢【实验探究】设计实验比较黄铜片和铜片、铝合金和纯铝的硬度。【演示实验】比较焊锡和组成它的纯金属锡、铅熔化的温度。焊锡的熔点比组成它的纯金属锡、铅的熔点低这与焊锡的用途有关吗?【归纳小结】合金的性能与组成它们的纯金属相比有什么特点?【师生互动】你知道在生活中有哪些常见的合金吗?说说它们分别具
12、有哪些优良性能。教师投影展示常见合金图片。【联想应用】下列物品可以用哪种合金来制造,并说明理由。(1)外科手术刀(2)防盗门(3)门锁(4)自行车支架(5)硬币(6)飞机【出示图片】神州六号,你知道它的材料应该具有哪些性质呢?【课堂小结】畅谈收获【板书设计】第一节常见的金属材料一、物理性质导体,文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 H
13、Z8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R
14、10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码
15、:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9
16、U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7
17、ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S1
18、0T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9
19、C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6名师精编优秀教案文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6
20、文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X
21、10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B
22、3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 H
23、Z8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R
24、10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码
25、:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6文档编码:CX10R1R10C9C1 HZ8S10T1B3Z7 ZM8X10H9U9R6