評論
打印
Hi, I'm Jessica
嗨 我是Jessica
And I'm going to be talking about a chemical demonstration today that I like
今天我要講的化學演示
to call "death of a gummy bear"
叫作"橡皮糖熊之死"
We eat these little guys all the time
我們總在吃這些橡皮糖
and our bodies break down the sugar in a series of chemical reactions
我們的身體能通過一系列化學反應分解其中的糖
but what happens when you break down the sugar in
但如果在體外分解橡皮糖熊
a gummy bear outside of our bodies?
情況會是怎樣的呢
Well, MIT's Dr. John Dolhun is going to show us
MIT的John Dolhun博士將給我們演示
Here he is at the Cambridge Science Festival at MIT
這是他在MIT劍橋科學節上進行演示的照片
Now, I'm going to actually be combusting a gummy candy
下面 我將來燃燒一個橡皮糖
and my wife said, please don't tell them it's a bear
我夫人叫我不要跟你們說這是一只熊
Guess what? It's a bear
但它確實是一只熊
and I'm going to eat one right now
我現在就要吃一個
and I'm eating a gummy candy
我吃了一個橡皮糖
It's sugar and
它由糖組成
I'm going to chew on it and eat it
我會嚼碎它 吃掉它
and what do you think that's going to happen to it?
知道它最終會怎樣嗎
It's going to break down into carbon dioxide
它會分解為二氧化碳
Tomorrow I'm going to be breathing out CO2
明天我會呼出二氧化碳
I'm going to be perspiring. Water's going to be coming out
我還會流汗 水會流出
And I'm going to make a lot of energy
我還會生成很多能量
And I'm going to take that energy and store it up as ATP
這些能量會以ATP的形式存儲起來
And it's going to help me clean all these dishes tomorrow
我能用這些能量來洗凈明天所有的盤子
I don't want to think about that but
我可不想想到這個
I'm going to need the energy
不過我需要能量
and now I'm going to do the same reaction inside of test tube
下面我將在試管中演示這個相同的反應
and I want you to compare what you just saw
我希望你們能夠對比剛看到的情況
You didn't see a lot of smoke and fire coming out of my mouth, did you?
你們沒有看到我嘴巴里冒出很多煙和火 對吧
Not yet, okay, alright
暫時還沒有 好吧
So, Clifton you can Clifton
你可以開始了
Clifton is going to play a little Rondo music while I set this reaction up
Clifton將會在我準備實驗時彈奏一小段回旋曲
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 他將一些固態氯酸鉀放入試管中
and heated it up
并對其加熱
The heat causes the solid to melt and become a liquid
熱會導致固體融化為液體
This little triangle means heat
這個小三角表示加熱
It turns it from a solid to a liquid
氯酸鉀從固態變為液態
As it's being heated, the liquid potassium chlorate
加熱時 液態氯酸鉀
immediately starts breaking down into two products
會立刻分解為兩種產物
potassium chloride and oxygen
氯化鉀和氧氣
Now potassium chloride is a solid and the oxygen is a gas
氯化鉀是固體 而氧氣是氣體
It looks like this
像這樣
