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幼儿园中班教师:科学:乌鸦喝水教案+PPT课件备课图片

幼儿园中班教师:科学:乌鸦喝水教案+PPT课件备课图片

中班科学活动:乌鸦喝水

一、活动目标:

1通过两次操作,感知物体大小与水位升高之间的关系。

2大胆交流自己的发现,体验解决问题的乐趣。

二、活动重点、难点

根据目标我把重点定位于:感知物体大小与水位升高之间的关系

难点定位于:能在操作中观察水位的变化,尝试边放弹珠边数数

三、活动准备:

1、大记录表一张

2、有标记的水每人一份

3、弹珠若干

4、Ppt课件

5、乌鸦手偶

四、活动过程

活动导入:乌鸦怎样才能喝到水

1出示乌鸦,边演示边引导幼儿想办法

“看,这是谁呀?

你们听过鸟鸦喝水的故事吗?那谁来告诉我乌鸦是怎么喝到水的?

哦,原来,乌鸦很聪明的,他找到了很多很多的石子,把石子放到瓶子里,石子就会沉下去,水就会上升。这样就能喝到水了

(二)出示各种材料

1今天,这只乌鸦又口渴了,他又得出去找水喝了,这回呀被它发现了一瓶水(实物红线瓶的水),教师演示乌鸦喝水,可是仍然喝不到呀,那你们觉得水到达什么地方鸟鸦就可以喝到了,对了!乌鸦就在瓶子上做了一个标记,画了一条红线。那有什么办法能让乌鸦喝到水的?扔石子,水上升到红线就可以了?可是没有石子呀,于是,乌鸦飞来飞去,这边找一找,那边找一找,我们来看看它都找到了些什么东西。哟!这是什么呀?

2引导幼儿比较三种东西的大小

“一共找到了几种弹珠?这三种弹珠一样吗?哪里不一样?”除了颜色不一样,还有什么不一样,我们来给他们比一比。这是大弹珠,这个弹珠稍微小一点,是中弹珠。这个最小了,是小弹珠

幼儿猜想

“乌鸦找到了三种大小不一样的弹珠你们猜猜这些弹珠放进去后乌鸦能喝到水吗?”

幼儿第一次操作

1教师交代操作要求

那你们想不想试一试让看看乌鸦到底能不能喝到水。我们给你们每人准备了两个弹珠。这两组桌上是每人两个弹珠,中间两组桌上是每人两个中弹珠,这边两组的桌子上是每人两个小弹珠。老师还准备了很多装着水的瓶子,上面都有红线哦。现在,请你们把小盒子里的

弹珠放进去吧。

提醒幼儿不要搬椅子到桌子边去,每人选择一组进行操作

师:请你自己仔细地观察一下,你瓶子里的水升到红线了吗?谁的到红线了?都到了吗?

3观察对比

组织幼儿回到座位上,观察三个瓶子进行对比。

4师:我们发现,放两个大弹珠能到达红线,记录

两个中弹珠差一点点,两个小弹珠还有一段距离呢!

5提问:哎,你有没有什么办法让小弹珠和中弹珠瓶子里的水也上升到红线?

(四)幼儿第二次操作

1教师交代操作要求

“那我们再试一试,把你的小弹珠、中弹珠再放进去一些。听好,乌鸦这回可有要求了,请小朋友边放边数好你一共放了几个水位到达红线的,我们刚才已经放了2个了,那应该从数字几开始数?

2都到红线了吗,说明乌鸦喝到水了。你选的是什么?用了多少中弹珠?”还谁也选了的?你用了多少?哦,原来放5个中弹珠能让乌鸦喝到水了。那应该用几个点子表示。

3“有没有小朋友用了小弹珠的?你一共用了多少小弹珠?用几个点子呀?

4小结:每一种弹珠都能让乌鸦喝到水了。大弹珠用了2个,中弹珠用了5个,小弹珠用了8个请想一想,你觉得乌鸦会选哪样东西让他能又快又省力的喝到水?(你觉得鸟鸦会选哪样东西让他能第一喝到水?)小弹珠(是吗?小弹珠需要几颗?那乌鸦要不停的放6次呢,当然用什么?大弹珠了

6感知物体大小与水位升高的关系

为什么呀?“刚才我们在观察的时候就发现了,大弹珠个头最大,所以放进瓶子里,水升得最快。那谁最慢?原来相比较,小弹珠的个头最小,所以放进瓶子里,水升得比较慢。原来水的上升和放进去的东西大小有关。东西个头大的,放进去水上升的快一点。个头小的,

放进去水上升的比较慢

活动延伸

乌鸦今天在小朋友的帮助下终于喝到了水,老师也给你们准备了

另外一些材料,看!(番茄、板栗、葡萄),等一会,我们也去试

试,哪样东西能让乌鸦又快又省力的喝到水。

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  1. CONNECT:[ UseTime:0.001327s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001928s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000702s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000744s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001625s ]
  6. SELECT * FROM `set` [ RunTime:0.000602s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001824s ]
  8. SELECT * FROM `article` WHERE `id` = 790950 LIMIT 1 [ RunTime:0.001225s ]
  9. UPDATE `article` SET `lasttime` = 1782307075 WHERE `id` = 790950 [ RunTime:0.023599s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.004729s ]
  11. SELECT * FROM `article` WHERE `id` < 790950 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005245s ]
  12. SELECT * FROM `article` WHERE `id` > 790950 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011713s ]
  13. SELECT * FROM `article` WHERE `id` < 790950 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003665s ]
  14. SELECT * FROM `article` WHERE `id` < 790950 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002575s ]
  15. SELECT * FROM `article` WHERE `id` < 790950 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009562s ]
0.215282s