Rebirth of Xueba's sweet wife

Chapter 107 Sister Kills You Instantly With Eggshells [2]

Others didn't notice, but Kong Qiuzhen saw Bei Kehan's little hand at a glance.

He smiled happily and announced: "Not bad, not bad, there are still 5 little guys who dare to compete. I thought that one generation is not as good as the previous generation, and they can't afford to win or lose!"

Everyone couldn't help breaking out in a cold sweat. It doesn't matter if you win or lose in a relationship. Anyway, it's not your old man who washed the test tube for a month...

Five children were moved to the front row so that everyone could see their experiments more clearly.

Everyone has three copper chloride raw materials in front of them, and if they ask for any other materials, they can also get three copies of each.

In other words, everyone has three chances.In case the experiment fails, it can be repeated twice.This can be regarded as Mr. Kong being happy, he gave them an extra relaxation of the competition conditions.

But in fact, three chances are really not too many.

No, there was a boy who used the iron powder replacement method. He just got the raw materials on stage, and with a shake of his hand, he accidentally poured most of a portion of iron powder down.

As a result, his share of copper chloride was immediately scrapped...

Excessive iron powder cannot purify copper in a short time anyway.

Because the displaced copper is mixed with the excess iron powder, it will take a lot of effort to purify it again.

The boy's face immediately turned as green as a high-concentration copper chloride solution.

The other two boys also chose the safest iron powder replacement method.Seeing the lessons learned from wasting an opportunity, they couldn't help becoming more cautious, thinking over every action, and taking paper and pens to record each dose of iron powder, carefully adjusting the concentration of the solution.

The raw materials that Zhou Qing applied for were somewhat different - carbon rods, power supplies, copper sheets... She fiddled with the positive and negative poles of the power supply repeatedly, gesturing back and forth with the copper sheets and carbon rods, which looked very sophisticated.

A classmate who couldn't bear the curiosity secretly checked Zhou Qing's materials with her mobile phone under the desk, and finally came to a conclusion-she was using electrolysis to purify copper!
The electrolysis method is much more ingenious than iron powder replacement!
"Our chemistry class representative is really giving everyone face! It seems that our class is going to have a junior apprentice of a famous teacher!"

"That's right, that's right, the least material, the fastest speed, the most purest copper... These three conditions must be Zhou Qing! Those three boys just came up to make soy sauce, hehehe..."

"It seems that the one who came to make soy sauce is that one—look, what is she doing with her hands empty?"

Everyone's eyes couldn't help but focus on Bei Kehan.

The place where Bei Kehan ​​was doing the experiment happened to be next to Zhou Qing.Unlike Zhou Qing's careful and busy work, she is as leisurely as if she came to the vegetable market to buy cabbage.

Bei Kehan ​​held three copies of copper chloride, looked to the left, to the right, to the sunlight, and placed them on the table.

Everyone else has applied for materials and started making, only she is still fiddling with the three copper chlorides.

Everyone in the audience looked anxiously, and couldn't help but wonder, maybe Bei Kehan ​​raised his hand impulsively, but found himself helpless when he came on stage.Now it's a shame to throw it at grandma's house...

Everyone couldn't help but began to worry silently, don't let the whole class leave a bad impression in front of the master because of Bei Kehan's ignorance and stupidity...

(End of this chapter)