評論
打印
Hi, I'm Jessica
嗨，我是Jessica
And today I'm going to be talking about chemical demonstration
今天我要講的化學演示
I like to call elements on fire
叫作著火的元素
Let's watch as MIT's Dr. John Dolhun --
我們來看MIT的John Dolhun博士
here he is --
這就是他
creates a rainbow of colors at the Cambridge Science Festival
如何在劍橋科學節上創造出彩虹般的色彩
So what I'd like to do is do a grand finale
下面我要演示一個壓軸好戲
by actually burning some elements
我將直接燃燒元素單質
since we're talking about elements
契合現在我們講的元素主題
and we're going to have a little Rondo music to go with this
演示過程中將播放一小段回旋曲
So Clifton can go ahead and do that
Clifton現在可以開始演奏了
I've got some lithium
我有一些鋰
some boron
一些硼
strontium, sodium, and potassium
鍶，鈉和鉀
So there should be quite a broad spectrum of colors here
這會產生出各種不同顏色
So the boron is a nice green color
硼是美麗的綠色
The lithium is a beautiful red
鋰是漂亮的紅色
Sodium back here is a yellow
后面這里的鈉是黃色
We've got a little bit of strontium
這里還有一些鍶
which is kinda the bluish red
呈現出帶藍色的紅色
I think the blue is probably the methanol
我想，藍色可能來自于甲醇
and the potassium is a little bit of a viole
而鉀則是一些紫色
and with a yellow color
帶有一些黃色
Can you see those?
可以看到這些嗎
So Dr. Dolhun puts sorts of five different elements and watch glasses
Dolhun博士將五種元素單質放到表面皿中
lithium
鋰
boron
硼
strontium
鍶
sodium
鈉
and potassium
和鉀
He also adds a little methanol to each watch glass
他還加入了少許甲醇到表面皿
Then he lights them all on fire
然后他點燃了所有這些物質
and they produce flames of different colors
它們產生了不同顏色的火焰
Lithium is red
鋰是紅色
Boron is green
硼是綠色
Strontium is a blue red
鍶是藍紅色
Sodium is yellow
鈉是黃色
And potassium is violet with yellow streaks
鉀是紫色，帶有黃色條紋
