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幼儿园课件互动版本油和水_科学_中班_教案+ppt课件图片

  • 2026-04-06 04:13:32
幼儿园课件互动版本油和水_科学_中班_教案+ppt课件图片

油和水

油水不相溶

中班科学

活动目标

l喜欢参与科学实验,对油水分离的现象感兴趣。

l知道油水分离时油在上层,水在下层。

l能积极操作、认真观察并清晰表达油水分离的实验现象。

活动准备

l经验准备:幼儿认识水,知道水是透明无色、会流动的。

l课件准备:“食用油泄漏”音频及图片;“油水分离”组图;“吸油”音频及图片;“海上大风”音效及图片;“油水不相溶”组图;“油水分离”音频及图片。

l材料准备:1.第一次操作:用一次性透明塑料杯装好小半杯食用油和小半杯水,人手一份。

2.第二次操作:每位幼儿再发放一根小木棍。

活动过程

l播放音频及图片“食用油泄漏”,激发幼儿活动兴趣。

——环保员奇奇接到了一个紧急求助电话,发生了什么呢?我们快一起去看看吧!

——发生了什么紧急事件?(一艘食用油运输船里的油漏到了大海里)

——油漏到了大海里,把大海弄脏了,这下该怎么办呢?老师有个小建议,我们可以试着模拟运输船漏油的情况,一起来帮助奇奇想想办法!

l出示组图“油水分离”、音频及图片“吸油”,引导幼儿发现油水分离且油在上层、水在下层的科学现象。

1.出示材料,引导幼儿分辨油和水。

——想要模拟运输船漏油的情况,我们要分别准备一杯油和水。你们能分辨出哪杯是水?哪杯是油吗?

小结:油和水都是液体,都可以流动。但油是浅黄色的;水是透明、没有颜色的。

2.出示组图“油水分离-1”,教师介绍操作要求。

——接着,我们要怎么模拟运输船漏油的情况呢?

1)把油慢慢地倒进水里或把水慢慢地倒进油里。

2)仔细观察实验现象。

3.幼儿操作,教师巡回指导。

Ø活动建议:1.教师提前用一次性透明杯装好小半杯水和小半杯油,每位幼儿一份操作材料,置于各组桌面。2.提醒幼儿倒

的时候要尽量对准容器的中央,慢慢倒,不要把水或油洒出来。

4.出示组图“油水分离-2”、音频及图片“吸油”,幼儿分享、交流,师幼共同小结。

——你把什么倒入了什么?

——结果怎么样呢?(油和水会分开,油在上层水在下层)

——所以漏到海里的油也会分层,浮在海面上。现在你们能想到办法处理这些漏到海里的油了吗?(把上层的油舀起来、用机器把上层的油吸走……)

小结:不论我们把油倒进水里,还是把水倒进油里,油和水都会分层,油在上层,水在下层。所以运输船上的油漏到海里也会分层,奇奇只要把上层的油舀起来或吸走,大海就又会变得干净。

l播放音效及图片“海上大风”、组图“油水不相溶”、发放材料“小木棍”,引导幼儿发现搅拌后油和水依然会分离。

1.播放音频及图片“海上大风”,鼓励幼儿猜测油和水搅在一起后的现象。

——糟糕,海上突然刮起了大风,大风卷起海浪,把油和水搅在了一起。这下油和水会不会混合在一起呢?

2.发放材料,教师介绍操作及观察要点。

——我们一起再来试一试吧。

——一会儿请你们用小木棍搅拌油和水,模拟海浪翻涌的情况。注意搅拌时速度不要太快,不要把油和水洒出来。

——搅拌时要仔细观察这时的油和水是什么样子的?搅拌之后,把小木棍拿出来,等待一会儿,看看又会发生什么呢?

3.幼儿操作,教师巡回观察。

Ø活动建议:教师在巡回观察时要提醒幼儿观察搅拌时及搅拌静置后的现象。

4.出示组图“油水不相溶”,幼儿分享、交流,师幼共同小结。

——搅拌时油和水是什么样子的?

——搅拌之后,你又发现了什么?

小结:搅拌时油和水看起来好像混合在一起了,但等待一会儿后,它们依然会分成两层,油还是在上层,水还是在下层。

l播放音频及图片“油水分离”,自然结束活动。

——所以即使大风把油和水搅在了一起,等风停后,它们依然会分成两层,油还是会在上层。我们快把这个好消息告诉奇奇吧!

——瞧,风停了,奇奇终于能顺利地把浮在上层的油吸走了,大海这下又变干净啦!

附【小知识

油和水不相溶,是因为水的分子和油的分子结构差别较大,分子之间不能相互结合。油的密度比水的密度小,同样体积的油和水,油要比水轻,所以油会浮在水面上。

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  1. CONNECT:[ UseTime:0.000866s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001460s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002448s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.011468s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001429s ]
  6. SELECT * FROM `set` [ RunTime:0.004878s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001683s ]
  8. SELECT * FROM `article` WHERE `id` = 475851 LIMIT 1 [ RunTime:0.003532s ]
  9. UPDATE `article` SET `lasttime` = 1775715973 WHERE `id` = 475851 [ RunTime:0.018818s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000757s ]
  11. SELECT * FROM `article` WHERE `id` < 475851 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002633s ]
  12. SELECT * FROM `article` WHERE `id` > 475851 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001374s ]
  13. SELECT * FROM `article` WHERE `id` < 475851 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004053s ]
  14. SELECT * FROM `article` WHERE `id` < 475851 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007807s ]
  15. SELECT * FROM `article` WHERE `id` < 475851 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010532s ]
0.227118s