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幼儿园幼小衔接科学教案:水电力的实验(含PPT课件图片)

  • 2026-04-19 16:16:53
幼儿园幼小衔接科学教案:水电力的实验(含PPT课件图片)

实验一:神奇的水

活动目标:

1.在观察,实验,操作中初步感知水添加糖后比重增加形成分层的现象。

2.在不断尝试中积累经验,初步形成耐心严谨,大胆尝试的科学品质。

3.体验科学活动带来的愉悦和成功感。

活动准备:

1.一次性水杯,红,蓝,绿,黄颜料水若干。

2.白糖每组一份,勺子,抹布若干。

3.一张小方桌,一张长桌。

活动过程:

(一)幼儿初步尝试师:小朋友们,你们喜欢玩水吗?今天黄老师就准备了好多颜色的水让你们玩一玩,猜一猜,如果我们把两种不同颜色的水倒在一起会发生什么事情?请你们去试一试,选两杯你喜欢的不同颜色的水,先看清楚是两杯什么颜色水,再把它们倒在一起,看看会怎么样?

(二)教师呈现奇妙的水,引导幼儿观察,激发幼儿的兴趣。

师:刚才你们的两杯水倒在一起都变了颜色,老师这里也有两杯水,是什么水?猜猜看,如果老师把这两杯水倒在一起会怎样呢?(幼儿回答)

师:老师要用这水变一个魔术咯!(教师示范把红水倒进蓝水)变怎么样了?几层?颜色有没有变掉?(我的双层水与幼儿浑水对比)

师:我的红水和你们的红水有什么不一样?为什么我的能变,而小朋友们的变不出来呢?请你们们睁大眼睛看清楚老师的杯底哦!(一杯普通红水和一杯加了糖的红水对比)

教师:原来老师的红水里有秘密,老师在红水里加了一种东西哦,猜猜看是什么?老师在水里面加了糖,就可以变出神奇的双层水了,想不想试一试?

(三)幼儿第二次操作教师:请小朋友们轻轻走到桌子旁,选择你喜欢的两种不同颜色的水,拿杯子的时候请轻轻拿,加糖时小心不要撒在桌子上。

(四)教师:你们变出神奇的双层水了吗?

1.把幼儿做成功的双层水放前面展示并请该幼儿说出成功的方法,再分析其他幼儿失败的原因。教师:是不是加了糖都会成功呢?我们请成功的小朋友说下他的成功秘诀吧。(请2位幼儿展示,说明加很多糖,把糖水倒在另一种颜色水里)

2.利用儿歌帮助幼儿总结要点。师:老师把他们成功的经验编成了一个魔法口诀,记住了这个口诀,我们就会变双层水的魔术了,一起来听一听。师:谁在做游戏呀?先给谁吃饱糖?嘴对嘴,轻轻倒,谁悄悄地躲下去了?师:首先确定你选择哪两种颜色,什么颜色当哥哥水,然后给弟弟水吃饱糖,再让哥哥弟弟在一起。(教师示范)教师:还想不想试一下呀?

(五)幼儿第三次操作:利用分享到的成功经验,再次尝试双层水。(颜色多种)教师:这个颜色好漂亮呀,是哪位小朋友的?你来说一下,怎么会变出这么漂亮的颜色的?

(六)总结并探索

教师:你们真了不起,做出了这么漂亮的双层水,这么神奇的双层水到底是怎么分成两层的呢?原来在其中一杯水里加了好多好多的糖,糖水就变得浓浓的、厚厚的、黏黏的,把它倒进另一杯不同颜色的水里,糖水就会沉下去。(直接呈现三层水“蓝黄红”)这个三层水又是怎么做成的呢?下次我们再来做三层水好不好呀?

实验二:带电的报纸

思考:不用胶水、胶布等粘合的东西,报纸就能贴在墙上掉不下来。你知道这是为什么吗?

材料:1支铅笔、1张报纸。

步骤:

1.展开报纸,把报纸平铺在墙上。

2.用铅笔的侧面迅速地在报纸上摩擦几下后,报纸就像粘在墙上一样掉不下来了。

3.掀起报纸的一角,然后松手,被掀起的角会被墙壁吸回去。

4.把报纸慢慢地从墙上揭下来,请注意倾听静电的声音。说明:1.摩擦铅笔,促使报纸带电。2.带电的报纸被吸到了墙。3.当屋子里的空气干燥(尤其是在冬天),如果你把报纸从墙上揭下来,就会听到静电的劈啪声。创造:请试一试,还有什么物品能不用粘和剂,而用静电粘在墙上?

实验三:瓶子赛跑

实验材料:

相同的空瓶2个、沙子、水、长方形木板、厚书2本。

实验步骤:

1.将一个空瓶装满水,一个空瓶装满沙子。

2.用木板和书搭成一个长斜坡。

3.把两个瓶子放在斜坡的同一其实高度,让其同时滚落,观察它们的到达情况。

实验原理:

沙子对瓶子内壁的摩擦比水对内壁的摩擦要大很多,而且沙子之间也有摩擦。摩擦力产生阻力,因此装沙的瓶子会比装水的瓶子要慢。

实验意义:

让孩子尽量多试几次,让他们知道装沙瓶子滑落慢并非是偶然的结果。然后就可以给他们讲讲关于摩擦力和阻力啦,多举些生活中的例子,比如轮胎、鞋底的防滑等等。

幼儿园幼小衔接科学活动《水电力的实验》PPT

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  1. CONNECT:[ UseTime:0.000664s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000872s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000505s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000626s ]
  8. SELECT * FROM `article` WHERE `id` = 483111 LIMIT 1 [ RunTime:0.013637s ]
  9. UPDATE `article` SET `lasttime` = 1777100872 WHERE `id` = 483111 [ RunTime:0.000733s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 483111 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001530s ]
  12. SELECT * FROM `article` WHERE `id` > 483111 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000857s ]
  13. SELECT * FROM `article` WHERE `id` < 483111 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006605s ]
  14. SELECT * FROM `article` WHERE `id` < 483111 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013774s ]
  15. SELECT * FROM `article` WHERE `id` < 483111 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003049s ]
0.116502s