评论
打印
Hi, I'm Jessica
嗨，我是Jessica
and today I'm gonna be talking about a chemical demonstration called
今天我要讲的化学演示叫作
the Briggs-Rauscher reaction
Briggs-Rauscher反应
This reaction was discovered by 2 San Francisco area high school chemistry teachers
这一反应的发现者是两位旧金山地区高中化学教师
Briggs and Rauscher
Briggs和Rauscher
who are working in the lab
他们在实验室
to come up with a visually striking way to demonstrate
得到了这种视觉上很引入注目的
an oscillating clock reaction
振荡时钟反应
Let's watch MIT's Dr. John Dolhun show us the reaction
来看看MIT的John Dolhun博士如何演示该反应
Here he is at the Cambridge Science Festival
这是他在剑桥科学节上的照片
OK, so what I'm gonna do is I'm gonna pour 3 colorless solutions into this beaker
我将把这三种无色溶液倒入烧杯中
Solution number one
第一种溶液
and I'm going to use kitchen chemistry
我将使用厨房化学方法
So I'm using my eye here
我将使用我的眼睛
Let me just see. OK, there we are
我看看，好了
Second solution
第二种溶液
And the third solution
第三种溶液
So what happened?
到底是怎么回事
Dr. Dolhun mixed 3 clear colorless solutions together
Dolhun博士混合了三种无色透明溶液
The first solution contains potassium iodate and sulfuric acid dissolved in water
第一种溶液是碘酸钾和硫酸的水溶液
The second solution is malonic acid and manganese sulphate monohydrate in water
第二种溶液是丙二酸和一水硫酸锰的水溶液
And the third is hydrogen peroxide in water
第三种溶液是过氧化氢的水溶液
And when mixed together, things get complicated
混合在一起时，反应会非常复杂
The overall reaction is this
总的反应是这样的
