Li Zheng realized that the joke had been finished.

So where's the laughing......

"Ah...... Isn't it funny?" Shen Yiyun scratched his head and smiled, "This, probably only the people of the Huayuan can understand." ”

"No, no, no, it's funny, if I knew the dean and the mentor, I would have laughed. ”

"Yes, yes, yes, the dean is a real overtime maniac, and the senior brother is equivalent to finding someone who takes a hundred steps to report fifty steps. ”

"Hahaha...... I see. Li Zheng forced a smile, and then said, "The stalk itself is more difficult to get, but the senior sister is really interesting to talk about, and you are definitely better looking at acting than the current Hua Dan." ”

"Oops, oops......" Shen Yiyun's face turned red again, "That's it...... Art comes from life~"

On the other side, Shi Yang pinched the dropper, as if he was about to pinch blood.

He listened to the whispers of the two mosquitoes.

It doesn't feel right.

Isn't this a field where chemistry is important?

Big sister chemistry, don't be fooled by this guy who looks like a scumbag.

Look at me here, look at me here.

However, Shen Yiyun and Li Zheng chatted more and more hotly, and couldn't help but perform more jokes about the courtyard, and from time to time they hid their faces and laughed for a while.

Shi Yang couldn't bear it anymore, so he only said in a deep voice: "Then I'll start?"

When Shen Yiyun heard this, his originally smiling face was instantly covered with a layer of frost.

"Well, please. ”

Shi Yang gritted his teeth.

Is it really a big change?

Big sister who can't do it.

I'm going to save you with my chemistry!

Shi Yang was so ruthless that he didn't even look at the experimental principles and steps, and this began his performance.

"Preparation and titration of coumarin-3-carboxylic acid, Yang Shi. ”

As he spoke, he unscrewed a dark reagent bottle (salicylaldehyde), pinched the dropper and immersed it for a while, then picked up the graduated cylinder, dripped the solution in, and after two quick repetitions, he screwed on the reagent bottle without looking at the graduated cylinder scale the whole time.

"Wait, it's going to be deducted. Shen Yiyun raised his hand and sneered, "Look at the roll - take 2 ml of salicylaldehyde, do you know how much you have taken?"

"2 ml. Shi Yangmu did not squint, and had already unscrewed the second reagent bottle (diethyl malonate),

Shen Yiyun's nose tightened, and he couldn't wait to check it immediately and kill his arrogance.

But as the second eldest sister of the research, she is really so stubborn, and she always looks very embarrassed.

Although Li Zheng is very good at observing words and feelings, he is not strong enough to see this layer, but with the instinct of curiosity, he went around to the test bench and lay on the table to stare at the scale.

2ml, exactly the same ......

There was once a legend that there was an eldest sister who sold sugar, known as "one grasp", how many catties and taels she wanted, she forced to catch it, it must be so much.

Now, he has witnessed a drop of accuracy from the cobalt god.

At this point, he turned his head to look at the man who had taken the reagent.

It's as if the whole person has an invisible aura of chemical molecules.

This man, he is no longer Shi Yang.

He is the god of cobalt.

At the same time—

[Student movement detected.] 】

[Shi Yang: 27]

[Learning Limit: 26.] 】

【Studying......】

【Student Movement 0.1......】

【 0.1……】

Li Zheng's eyes widened.

He didn't close his eyes, he didn't close his eyes before he sucked up the student movement.

Now, the only reference for the student movement is Li Zheng himself.

Yes 4.

And Shi Yang, the ** person, has nearly 7 times his luck.

His experimental talents are really the atmospheric luck needed by the times.

Mine, mine, all mine!

Of course, stealing luck or something, it's just a joke.

For readers, this is learning, brainstorming, and improving together.

Since the system clearly says that it is learning, then the luck of the Cobalt God will not be reduced because of this.

Inside and outside, the country's luck increases out of thin air, and good things are right.

Li Zheng stared at Shi Yang intently, and returned to Shen Yiyun's side.

"It's really 2 milliliters, it's exactly ......," Li Zheng said softly.

"Uh......" Shen Yiyun said hatefully, "this...... It's not very difficult, there was a senior brother three years ago...... You can also. ”

Shi Yang's side, once he started the test, as if he couldn't hear the person on the other side at all, in the blink of an eye, he had poured 2.4ml of diethyl malonate and 10ml of absolute ethanol into a 50ml round-bottom flask.

In the middle, there are naturally a lot of small tricks and small actions.

For example, when adding absolute ethanol, Cobalt God obviously slowed down the speed of addition, and at the same time quickly rotated the flask, turning the circle and pouring.

Obviously, this is intentional by the cobalt gods.

But Li Zheng couldn't see through it.

I had to lean into the ear of my eldest sister: "Why ......"

Before he could ask his doubts, Shen Yiyun replied: "When I dropped the reagent before, it was inevitable that some of them would stick to the wall of the bottle, and he did this in order to use absolute ethanol to wash down the other raw materials on the wall of the bottle." ”

Li Zheng said "hmm", and then realized.

These small details are impossible to write on the test questions.

Only the big guys who have really done a lot of experiments will naturally form some habit skills.

We're just getting started, and there must be a lot of tricks like that.

Cobalt God, show your student luck to the fullest.

On the other side, after Cobalt God prepared the solution, put the flask on the oil bath holder, fixed it, and then used a high-precision plastic syringe to take some piperidine, probed the needle into the bottle, and injected it very carefully, and the solution turned yellow.

"Hmph......" Shen Yiyun suddenly smiled, but quickly stopped.

What did she see?

Li Zheng didn't know.

I don't even know if I suspect that I asked.

Well, then don't ask, just hum it as if you know it well.

"Hmph. ”

The cobalt god didn't pay attention to the two of them at all, took another tube of glacial acetic acid, and hung his hand motionless on the beaker, fixed it in the middle position for a long time, and then dripped in.

Different from the previous chic movements, these two drops are very cautious, presumably for fear of sticking to the wall of the bottle.

Chemical experiments have strict dosage requirements, many times only one drop, a little more or less, will affect the reaction rate and amount, and even unexpected strange reactions will occur in serious cases, which will eventually lead to the failure of the experiment.

Take this question of preparing coumarin as an example, the final yield score is as high as 40 points.

In this case, the theoretical yield is 2.53 grams.

But that's just the theory, there isn't any molecule that loses yield.

In an environment such as a university laboratory, the yield limit is about 90% of the theoretical yield under human manual manipulation.

Therefore, when scoring, as long as the final yield is higher than 80%, it is a full score, 40 points.

70%, 35 points.

60%, 30 points.

And so on.

Looking at the cobalt god who skillfully placed the condenser tube, Shen Yiyun finally became serious: "This kind of question, according to undergraduate standards, as long as the yield reaches 70%, it is considered excellent." ”

"That's 1.78 gram......s," Li Zheng muttered, "but the full score of the competition is required, and the yield must be higher than 80%, that is, ...... 2 grams. ”

"Basically impossible. Shen Yiyun shook his head very confidently and said, "It's not that it's theoretically impossible, it's just that it's impossible for people who do it for the first time, it's very good to be able to reach 70%, if you have a week, do it dozens of times, constantly fine-tune the dose, time and temperature, pursue the limit, and probably be able to study some ways to increase the yield." ”

"Dose, time, temperature ......" Li Zheng couldn't help but say, "Isn't this alchemy......"

"It's not too much. Shen Yiyun raised his glasses, "Chemical experiments are essentially manipulating the molecular activities of the microscopic world, creating the substances needed through the magic of bonds and rings. ”

"Hmm......" When Li Zheng heard this, he felt that he had finally touched a trace of chemistry.

At this time, he looked at Shi Yang, who was concentrating and smiling evilly.

Li Zheng seemed to see a creator of a microcosm.

It turns out that this is the thrill of chemistry!

Damn it.

My hands started to itch.

I really want to do experiments.