评论
打印
Hi, I'm Jessica
嗨，我是Jessica
And today I'm going to be talking about chemical demonstration
今天我要讲的化学演示
I like to call elements on fire
叫作着火的元素
Let's watch as MIT's Dr. John Dolhun --
我们来看MIT的John Dolhun博士
here he is --
这就是他
creates a rainbow of colors at the Cambridge Science Festival
如何在剑桥科学节上创造出彩虹般的色彩
So what I'd like to do is do a grand finale
下面我要演示一个压轴好戏
by actually burning some elements
我将直接燃烧元素单质
since we're talking about elements
契合现在我们讲的元素主题
and we're going to have a little Rondo music to go with this
演示过程中将播放一小段回旋曲
So Clifton can go ahead and do that
Clifton现在可以开始演奏了
I've got some lithium
我有一些锂
some boron
一些硼
strontium, sodium, and potassium
锶，钠和钾
So there should be quite a broad spectrum of colors here
这会产生出各种不同颜色
So the boron is a nice green color
硼是美丽的绿色
The lithium is a beautiful red
锂是漂亮的红色
Sodium back here is a yellow
后面这里的钠是黄色
We've got a little bit of strontium
这里还有一些锶
which is kinda the bluish red
呈现出带蓝色的红色
I think the blue is probably the methanol
我想，蓝色可能来自于甲醇
and the potassium is a little bit of a viole
而钾则是一些紫色
and with a yellow color
带有一些黄色
Can you see those?
可以看到这些吗
So Dr. Dolhun puts sorts of five different elements and watch glasses
Dolhun博士将五种元素单质放到表面皿中
lithium
锂
boron
硼
strontium
锶
sodium
钠
and potassium
和钾
He also adds a little methanol to each watch glass
他还加入了少许甲醇到表面皿
Then he lights them all on fire
然后他点燃了所有这些物质
and they produce flames of different colors
它们产生了不同颜色的火焰
Lithium is red
锂是红色
Boron is green
硼是绿色
Strontium is a blue red
锶是蓝红色
Sodium is yellow
钠是黄色
And potassium is violet with yellow streaks
钾是紫色，带有黄色条纹
