2022年人教版科学五年级下册第一章第1课《水的变化》word教案 .pdf

名师精编优秀教案水的三态变化(教学设计)(2009-05-22 08:12:53)转载标签：杂谈水的三态变化(教学设计)一、教学目标1通过认识水的三态活动，知道水在自然界中有不同的表现形式，欣赏感受大自然的神奇和美丽。2通过认识水的性质活动，知道水的三态变化的一些科学术语（沸点、熔点、熔化、沸腾、凝固、液化、升华和凝华）及其各自的定义。3通过应用科学术语活动，能选择适当的使用科学术语来解释日常现象，强化应用科学术语的意识。4通过用粒子模型来解释水的三态变化活动，理解引起水的三态变化原因，培养学生分析比较和表达交流能力。二、学习重点和难点【重点】1认识水的三态变化。2 用实验数据来说明冰熔化或水沸腾时，虽然吸热但是温度不变，知道熔点和沸点的含义。3 用粒子理论来解释水的三态变化。【难点】1正确使用科学术语描述日常现象中水的三态变化。2 用粒子理论来解释水的三态变化。名师精编优秀教案三、教学准备【器材】活动一：水、冰块、烧杯、多媒体影像播放器实物投影仪活动二：碎冰块、热水、温度计、漏斗、烧杯、铁架台和铁夹、电子停表、酒精灯、平底烧瓶、带孔铁片、石棉网、玻璃片（或瓷砖、镜子）、三脚架、坩埚钳活动三：实物投影仪活动四：实物投影仪（或电脑）【资源】工作纸、图片（或水的三态变化粒子模型FLASH 课件）、自然界水的各种美景影像资料、水的凝华（制霜）实验录像【活动设计】活动一：水的表现形式分类活动目标：观察、欣赏自然界水的不同表现形式，并欣赏感受大自然的神奇和美丽。说一说画面中各种水的表现形式。按固态、液态、气态的性质辨别水的形态，并给水的不同形式进行分类，说说自然界中这些水的表现形式是怎样形成的。教师用多媒体影像资料展示自然界水的各种美景，唤起学生的生活经验，不仅可以直接从形态上归纳出水的各种形态，同时也可以激发学生的研究兴趣。文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 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ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8名师精编优秀教案活动二：认识水的性质活动目标：1从冰的熔化实验中，知道熔化这一科学术语和它的定义。通过实验中数据的记录、比较分析，知道熔点的概念及一般冰的熔点是 0。2从水的沸腾实验中，知道沸腾这一科学术语和它的定义。通过实验中数据的记录、比较分析，知道沸点的概念及一般水的沸点是 100。3通过实验条件的分析讨论，知道冰块需要吸收能量才能熔化，水需要吸收能量才能沸腾。4通过观察水的液化，知道液化这一科学术语和它的定义。5通过水的凝固家庭实验的回顾和分析，知道液化这一科学术语和它的定义。6通过录像观察到的现象的分析交流，知道凝华这一科学术语和它的定义。7通过阅读，举例，知道升华这一科学术语和它的定义。写出水从固体到液体的变化名称，知道科学术语“熔化”。小组进行“熔化”实验：观看书中装置图，讨论实验要点和注意事项。小组进行“熔化”实验，记录数据。交流现象、数据及分析数据，知道熔化过程和熔点的定义，知道一般冰的熔点是0 分析某些小组数据异常的原因。经过讨论知道冰块需要吸收能量才能熔化。文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 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ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8名师精编优秀教案小组用温度计熔化后烧杯中水的温度。学生知道只有完全熔化成水后，温度才能上升。（当然这一步骤也可以不做。）小组进行“沸腾”实验：根据开展“熔化”实验过程，开展实验，知道沸腾、沸点和水的沸点，讨论得到水需要吸收能量才能沸腾。小组进行“液化”实验：根据书中的实验步骤和装置图开展实验，用手测试玻璃片的初始温度、沸腾水的烧杯口水蒸气的温度，按照书本步骤（b）记录观察到的现象。知道水遇冷液化及液化这一科学术语。课前按照课本进行“凝固”的家庭实验，记录实验现象。课堂交流实验现象，知道液体遇冷变成固体的凝固现象。知道凝固这一科学术语。阅读书本，知道凝固点的定义以及同一物质的熔点和凝固点相同。知道升华这一科学术语和含义，并例举生活实例。写出变化名称，会出现“融化”、“熔化”、“溶化”，把学生的思维、原有认识暴露，告诉“溶化”是错误的写法。其中“熔化”是这一过程的科学术语。在此活动最后，关于冰块需要吸收能量才能熔化后，学生对为何是“熔化”而不是“溶化”会有更好的理解。活动三：应用科学术语文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8名师精编优秀教案活动目标：1分析并运用所学的科学术语完成水的三态变化关系图的填写，系统认识水的三态变化。2通过选择恰当的科学术语解释实例活动，进一步理解水的三态变化，发展学生的综合分析能力和运用科学属于的意识。学生活动指导要点小组交流：观察，分析学习重点中的图，理解箭头的意思。使用实物投影仪展示，选用水的三态变化科学术语填入图中的相应位置，系统认识水的三态变化。指导学生理解图中箭头的含义。指导运用活动一分类结果来分析并正确运用各科学术语描述。活动四：用粒子理论模型解释水的三态变化。活动目标：通过画水的三态粒子模型图，分析三态变化时能量、粒子运动和间隙的关系，描述水的三态变化过程，理解水的三态变化的原因。回忆物质三态的粒子模型，分别画出冰、水和水蒸气的粒子模型图。结合书本内容（或FLASH 课件），运用受热时，吸收的热量转化为粒子的动能，引起粒子运动加快、粒子之间的间隙增大等来解释水的三态变化。文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8名师精编优秀教案尝试解释为什么冰的熔化或水的沸腾虽然在吸收了外界的热量，但是温度不变。帮助学生回忆物质三态的粒子模型。辨别并写出以下日常生活现象中属于哪种水的三态变化（用科学术语描述）。1下雨：2 冬雾：3 下雪：4洗完澡浴室四周的墙壁上的水珠：5棒冰周围“冒出的白气”：1、提问：露是怎样形成的？2、谈话：我们从水蒸气凝结成水变化中认识了露的形成。今天我们再继续对水蒸气进行研究，以了解霜的形成。二、学习新课1、认识水蒸气遇冷（0以下）会结冰。（1）谈话：今天你们桌上的金属罐内都装有冰块，这些冰是什么变的？水能变成冰，水蒸气能直接变成冰吗？下面我们做个实验来观察一下。（2）讨论实验方法。文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8名师精编优秀教案（3）指导实验：一只罐内加少许水，另一只罐内冰上撒上30的食盐。观察两金属罐的壁上各有什么出现，同时测量一下两罐内的温度。（观察时，不要对罐壁呼出气体。）（4）汇报实验结果。（5）师生小结：空气中的水蒸气遇冷会凝结成水，当遇冷在 0以下时便会结成冰2、认识雪和霜的成因。（1）谈话：我们知道了空气中的水蒸气遇冷在0以下时会凝结成冰。你们能不能根据这一事实，推想一下，下雪是怎么回事吗？（2）分组讨论。（3）学生汇报。（4）比较雨和雪成因有什么相同，有什么不同。（5）根据露形成的过程，推想霜的形成，说说露和霜的成因有什么相同，有什么不同。（6）小结：雪和霜，都是空气中的水蒸气遇冷在0以下时结成的小冰晶，雪是从高空中落下的，而霜是地面上空气中水蒸气凝结成的小冰晶附着在冷的物体上的。3、认识水的三态变化的规律。（1）谈话：我们学习关于水、水蒸气、冰三者之间的变化。请同学们互相讨论一下，你们能用图示表示出它们之间的变化条件文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:CV7W9E9Q7P9 HE10D10X3O5B1 ZF3N10C8Z8J8文档编码:C