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Hi, I'm Jessica
嗨 我是Jessica
And I'm going to be talking about a chemical demonstration today that I like
今天我要讲的化学演示
to call "death of a gummy bear"
叫作"橡皮糖熊之死"
We eat these little guys all the time
我们总在吃这些橡皮糖
and our bodies break down the sugar in a series of chemical reactions
我们的身体能通过一系列化学反应分解其中的糖
but what happens when you break down the sugar in
但如果在体外分解橡皮糖熊
a gummy bear outside of our bodies?
情况会是怎样的呢
Well, MIT's Dr. John Dolhun is going to show us
MIT的John Dolhun博士将给我们演示
Here he is at the Cambridge Science Festival at MIT
这是他在MIT剑桥科学节上进行演示的照片
Now, I'm going to actually be combusting a gummy candy
下面 我将来燃烧一个橡皮糖
and my wife said, please don't tell them it's a bear
我夫人叫我不要跟你们说这是一只熊
Guess what? It's a bear
但它确实是一只熊
and I'm going to eat one right now
我现在就要吃一个
and I'm eating a gummy candy
我吃了一个橡皮糖
It's sugar and
它由糖组成
I'm going to chew on it and eat it
我会嚼碎它 吃掉它
and what do you think that's going to happen to it?
知道它最终会怎样吗
It's going to break down into carbon dioxide
它会分解为二氧化碳
Tomorrow I'm going to be breathing out CO2
明天我会呼出二氧化碳
I'm going to be perspiring. Water's going to be coming out
我还会流汗 水会流出
And I'm going to make a lot of energy
我还会生成很多能量
And I'm going to take that energy and store it up as ATP
这些能量会以ATP的形式存储起来
And it's going to help me clean all these dishes tomorrow
我能用这些能量来洗净明天所有的盘子
I don't want to think about that but
我可不想想到这个
I'm going to need the energy
不过我需要能量
and now I'm going to do the same reaction inside of test tube
下面我将在试管中演示这个相同的反应
and I want you to compare what you just saw
我希望你们能够对比刚看到的情况
You didn't see a lot of smoke and fire coming out of my mouth, did you?
你们没有看到我嘴巴里冒出很多烟和火 对吧
Not yet, okay, alright
暂时还没有 好吧
So, Clifton you can Clifton
你可以开始了
Clifton is going to play a little Rondo music while I set this reaction up
Clifton将会在我准备实验时弹奏一小段回旋曲
So what is Dr. Dolhun doing?
Dolhun博士做了什么呢
First, he put some solid potassium chlorate in a test tube
首先 他将一些固态氯酸钾放入试管中
and heated it up
并对其加热
The heat causes the solid to melt and become a liquid
热会导致固体融化为液体
This little triangle means heat
这个小三角表示加热
It turns it from a solid to a liquid
氯酸钾从固态变为液态
As it's being heated, the liquid potassium chlorate
加热时 液态氯酸钾
immediately starts breaking down into two products
会立刻分解为两种产物
potassium chloride and oxygen
氯化钾和氧气
Now potassium chloride is a solid and the oxygen is a gas
氯化钾是固体 而氧气是气体
It looks like this
像这样
