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【幼儿教案】《细菌的秘密》幼儿园科学健康教案+PPT课件

  • 2026-05-07 08:17:38
【幼儿教案】《细菌的秘密》幼儿园科学健康教案+PPT课件

《细菌的秘密》幼儿园科学健康教案+PPT课件

幼儿园课件套餐

幼儿园科学活动《细菌的秘密》

设计意图:

在疫情期间,我们的防御意识已经提高了很多,知道尽量少出门,出门戴口罩,勤洗手等。其中,预防新型冠状病毒的重要一环就是洗手。因此,设计了科学活动《赶走细菌》,借用“细菌”(胡椒粉)被洗手液赶走了的现象,让小朋友深刻地认识到洗手的重要性,并学习洗手的正确方法,从而养成勤洗手、讲卫生的良好习惯。 

活动目标:

1、初步了解洗手液里包含的表面活性剂会破坏水的表面张力和水膜的科学原理。

2、通过活动,知道洗手的重要性,并学习洗手的正确方法,养成勤洗手的良好习惯。

3、体验科学游戏带来的乐趣。

活动准备:1、课件,《细菌不是用来分享的》绘本图片

2、盘子、清水、胡椒粉、洗手液

活动过程:

一、绘本导入,引起赶走细菌的兴趣。

师:小朋友你们好,你们知道什么东西非常小,小到你看不到它,又能让你生病吗?

师:对了,是细菌。它们会存在于空气,食物和水中,还会在你的身上以及你接触过的东西上。

师:当然,细菌还有可能会出现在各种地方,比如:门把手、存钱罐、游乐场、鞋子、马桶等等。

师:细菌无处不在,我们该怎么赶走细菌,保护好自己呢?来看一下老师带来的科学小实验《赶走细菌》吧。

二、介绍实验材料。

师:这个实验我们需要用到的材料有一杯清水,一个盘子,胡椒粉,和一瓶洗手液。材料准备好了,让我们一起来实验吧。

三、实验操作部分。

师:首先在盘子底部倒入清水。再倒入适量的胡椒粉,胡椒粉就像细菌一样浮在水面上。我们试一下把手指伸入水中,然后把手指拿起来,看,手指上沾满了“细菌”。

师:小朋友想一想有什么办法可以让我们的小手伸入水中时不沾上“细菌呢?”

师:小朋友想得办法真多呀,现在来试试老师的办法吧。首先,我们在手指上涂上洗手液,再把手指伸入水中,会发生什么事情呢?

师:哇!神奇的事情发生了,“细菌”全部被赶走了。小朋友你们想知道是为什么吗?

四、解释实验原理。

师:其实是因为洗手液里包含的表面活性剂破坏了水的表面张力和水膜,使得质量较轻的胡椒粉不能被水膜承载,因此胡椒粉就会朝着远离洗手液的方向移动。从人的角度来看,就是胡椒粉遇上洗手液之后散开了。

五、学习洗手的正确方法。

师:所以,赶走细菌的好办法就是勤洗手,最好是用流动的清水洗,还要抹上适当的洗手液。现在跟着老师来洗手吧。先把小手用水冲洗一下,涂上洗手液,还可以边念儿歌边洗手。两个好朋友,手碰手;你背背我,我背背你;来了一只小螃蟹,小螃蟹;两只小螃蟹,手握手;举起两个大钳子,大钳子;螃蟹和我点点头,点点头;螃蟹和我握握手,握握手。好了,用水把小手冲洗干净。。。。

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  1. CONNECT:[ UseTime:0.000594s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000808s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000243s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000569s ]
  6. SELECT * FROM `set` [ RunTime:0.000309s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000622s ]
  8. SELECT * FROM `article` WHERE `id` = 500974 LIMIT 1 [ RunTime:0.022589s ]
  9. UPDATE `article` SET `lasttime` = 1778400746 WHERE `id` = 500974 [ RunTime:0.000658s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.002658s ]
  11. SELECT * FROM `article` WHERE `id` < 500974 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000471s ]
  12. SELECT * FROM `article` WHERE `id` > 500974 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001056s ]
  13. SELECT * FROM `article` WHERE `id` < 500974 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.023032s ]
  14. SELECT * FROM `article` WHERE `id` < 500974 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.069427s ]
  15. SELECT * FROM `article` WHERE `id` < 500974 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.038440s ]
0.233681s