“水面马戏团”水的表面张力课教案_水的表面张力教学设计

“水面马戏团”水的表面张力课教案由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“水的表面张力教学设计”。

TOOT科学实验活动课surface circus教案

.Teaching Goals 教学目标

知识目标：水分子的特征，水的表面张力。

能力目标：通过实验锻炼学生的观察力，想象力，逻辑思维能力及归纳概括能力，提高学生情商。

价值观目标：

.Difficulties 教学难点重点

通过实验理解液体的表面张力及凝聚力.Materials 教具准备

泡泡液，至少3支削尖的铅笔，1个小转笔刀，2个密封的实验袋， 制作一个纸质大铅笔, 1个大的一次性碗，胡椒粉，瓶装洗衣液。

Seion 1: Teaching Proce教学过程

一．自我介绍：self-introduction Hello, everyone, my name is Anna..Can you say hello Anna ?This is my partner, Cheevin.Let’s say hello to Cheevin? Great!Now ,Anna got a ball in my hand ,if any of you could say: “hello,anna!loudly.I will throw my ball to the you ok? Let’s have try.这时助教需带头大声喜爱那个主教问好来带动孩子，同时在此环节中老师会逐个让每位学生接到球，并问接球的学生姓名并让班级其他小朋友一起向该生打招呼 互相认识后，老师说：欢迎大家到来!Big hands for your coming.Does anyone know what do i do and Why we are here? Look I am a scientist..Today we will explore the magic science world together Ok? 二．课堂规则：cla rules:1.be very careful with experiments staff, be very polite, more question.more English.go to bathroom.三．引入：blow the soap bubble, why they are sphere? show a picture of a bug walking on the water.（感受）Teacher talk:Have you ever seen one of those little bugs or spiders walk on the water? Do you know why they do not fall into the water?（想象）Sure, they can do this due to the surface tension.Write on broad and read three times.Now let’s do an experiment to find out.四．实验一：Ziploc pencil stab 执行

过程及教师用语:Experiment proce &Teacher talk 1.Each group(1 group =3 children)will get a ziploc bag.2.Fill the bag halfway to the top with water and then zip it shut.3.Give out 3 pencils for each group.4.Let each student pick up 1 pencil and carefully,gently drive it through the beg.take turn in group!

5.Poke the pencil in below the water level.Leave the pencil in the bag.don’t take it out.WOW,not a drop spilled!

6.Keep doing it until you have 3 pencils sticking completely through your bag.Who can tell me what happened? Those water molecules really hold hands tight!That is why the water did not spill out!总结应该放到最后，最好由学生自己表达出来

分享及原理宏观化：Water molecules really know how to stick together-they are good friends.students stand in a line holding hands ,use the manual paper pencil to poke in the middle, then students hug together by two sides.Water is very cool,right? Now let’s try another one.It’s called pepperin bowl.实验二：pepper in bowl:(执行）

实验过程:Experiment proce &Teacher talk 1.Give each group a little bowl filled with water.2.Choose one student takes some pepper and sprinkles it onto the water in the bowl.Now let’s just notice our bowl.Notice that the pepper is floating and it is pretty much covering the surface of the water.3.The second child will squeeze 1 drop of soap right into the bowl of water.4.Watch what happens!WOW that was incredible!What happened? 5.The soap just made the water molecules spread out!Notice how the pepper was pulled to the sides of the bowl!分享及原理宏观化Sharing &Rational ：（分享）

Summarize the proce.The soap molecules push in between the water molecules and break them up.The water molecules are no longer holding hands.Cool!This is how soap cleans things.Group one pretend to be the soap drop molecules, group two should hold hands to be the water molecules.group one rush in the group two , group one was spread out.六．下期看点：

In next seion, we will explore how to make sinking things float!Ok!See you next time!