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2026人教版三年级科学下册(全册)教案

  • 2026-06-16 02:42:25
2026人教版三年级科学下册(全册)教案
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第一单元溶解与分离

盐和糖的溶解

把盐析出来

将不同的物质分离

第二单元从种子到种子

播种发芽

根和茎

开花结果

植物的一生

第三单元土壤和矿产资源

认识土壤

不同质地的土壤

10 土壤资源

11 矿产资源

第四单元加热与冷却

12 液体受热遇冷会怎样

13 固体也会热胀冷缩吗

14 空气的热胀冷缩

第五单元运动和能量

15 球的运动

16 运动中的能量

第六单元动力小车

17 设计制作动力小车

18 测试改进动力小车

19 赛小车

资料部分展示

第一单元溶解与分离

盐和糖的溶解

把盐析出来

将不同的物质分离

单元整体说明

本单元隶属于新课标物质科学领域,围绕溶解与分离核心主题,落实科学观念、探究实践、科学思维、态度责任四大核心素养。通过动手实验、观察对比、实操探究,让学生认识溶解现象、掌握简单分离方法,培养证据意识和动手实践能力,感受科学与生活的紧密联系。

课时安排:每课2课时(探究+总结拓展),共6课时;单元综合实践1课时。

1盐和糖的溶解教案

一、教学目标

1. 科学观念

知道盐、糖放入水中会慢慢消失,形成均匀稳定的水溶液,这种现象叫做溶解;了解有些物质能溶解在水中,有些物质不能溶解在水中。

2. 探究实践

能规范完成盐、糖溶解的对比实验,学会用搅拌、观察等方法探究溶解现象,如实记录实验现象。

3. 科学思维

能通过观察对比,区分溶解与不溶解的物质,初步归纳溶解的基本特征。

4. 态度责任

保持对物质溶解现象的好奇心,养成认真观察、如实记录的科学习惯,乐于小组合作探究。

二、教学重难点

重点:认识盐、糖的溶解现象,掌握溶解的基本特征。

难点:准确描述溶解现象,区分溶解与不溶解。

三、教学准备

分组材料:透明烧杯、清水、玻璃棒、食盐、白糖、沙子、小苏打、观察记录表;教师演示材料:课件、溶解过程动态图、对比实验装置。

四、教学过程(2课时)

1课时:探究盐和糖的溶解

1. 情境导入(5分钟)

出示糖水、盐水,提问:喝糖水的时候为什么看不到糖?盐放入菜汤里也不见了,这是为什么?引发学生思考,引出课题《盐和糖的溶解》。

2. 实验探究:观察盐、糖在水中的变化(20分钟)

1)教师示范实验操作:取适量清水倒入烧杯,放入一小勺盐,静置观察;再用玻璃棒轻轻搅拌,继续观察现象,强调实验安全和操作规范。

2)学生分组实验,依次探究盐、白糖在水中的变化,对照观察记录表,记录放入前、静置后、搅拌后的现象,教师巡视指导。

3)小组汇报:描述盐和糖放入水中的变化,总结慢慢消失、水变均匀、看不到颗粒的特点。

3. 对比实验:哪些物质能溶解(10分钟)

发放沙子、小苏打,学生分组实验,对比观察是否溶解,完善记录表,初步判断物质能否溶解。

4. 课堂小结(5分钟)

梳理实验现象,讲解溶解的定义,巩固盐、糖能溶解在水中的认知。

2课时:总结拓展+巩固练习

1. 复习回顾(5分钟)

回顾溶解定义,抽查小组实验记录,纠正错误表述。

2. 深入探究:影响溶解快慢的因素(15分钟)

提出问题:怎样让盐溶解得更快?引导学生猜想搅拌、温度、颗粒大小的影响,简单演示对比实验,初步感知溶解快慢的条件。

3. 课堂练习(10分钟)

完成判断题、分类题,区分溶解与不溶解物质,强化科学观念。

4. 拓展延伸(5分钟)

思考:生活中还有哪些溶解现象?为下一课分离溶解物质做铺垫。

五、板书设计

盐和糖的溶解

现象:盐、糖放入水中颗粒消失水变均匀、透明

定义:物质均匀分散在水中,形成稳定水溶液的现象溶解

能溶解:盐、糖、小苏打

不能溶解:沙子

六、教学反思

需重点规范学生搅拌操作,提醒如实记录实验现象;针对动手能力弱的小组,加强一对一指导,确保全员参与实验探究。

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  1. CONNECT:[ UseTime:0.000418s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000950s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.003236s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 507179 LIMIT 1 [ RunTime:0.000471s ]
  9. UPDATE `article` SET `lasttime` = 1782162889 WHERE `id` = 507179 [ RunTime:0.006613s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000472s ]
  11. SELECT * FROM `article` WHERE `id` < 507179 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000444s ]
  12. SELECT * FROM `article` WHERE `id` > 507179 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000372s ]
  13. SELECT * FROM `article` WHERE `id` < 507179 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019695s ]
  14. SELECT * FROM `article` WHERE `id` < 507179 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001137s ]
  15. SELECT * FROM `article` WHERE `id` < 507179 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001602s ]
0.107827s