After all the students formed a ring in twos, Hu Zengwu also opened the slide and began experimental teaching.

His style is obviously different from Zhou Yi, more rigorous, and every step is meticulous and standard, and he will not pass by the places that are taken for granted (just what he thinks) like Zhou Yi.

But at the same time, there is also a bit of a taste of reading at a glance, and it is unlikely that there will be any impact, so it can be said that it is not much different from self-study.

Of course, this is not his fault, after all, a wonderful person like Zhou Chenghuan is too rare.

At present, Hu Zengwu's rhythm is naturally a little sleepy for Li Zheng, but he still insists on listening hard, mainly to correct some unhealthy trends that Shi Yang has learned.

Just like the "neutral slide" when learning to drive, the speed is medium, seeing the red light in the distance, hanging to the neutral gear and sliding it by inertia, which is a fuel-saving and labor-saving operation, but in the driver's license test, this operation is to deduct points.

Shi Yang, an old driver, is naturally full of this kind of tricks, and he shouldn't learn it all, maybe a certain operation is safe in the environment at the time, but it's hard to say if he changes the conditions.

Li Zheng, as an apprentice of history, can be regarded as half a wild man, and it is not useless to come back and re-understand the rigor of pedantry.

After an hour of hard work, the basic experimental routines were explained.

After resting for 10 minutes, Hu Zengwu asked Shen Yiyun to send out the experimental test questions and materials.

Each person has a roll, plus a small bag of industrial salt mud, and the rest of the necessary reagents are placed on the shared laboratory table before class.

As soon as they came up, they played the real questions, and most of the students were a little flustered, even if they were theoretical bosses, there were very few opportunities for experiments in the past.

A small flat head in the front row glanced at the roll and raised his hand and said, "Teacher Hu, you can take us to do it first, right?"

On the stage, Hu Zengwu closed the notebook and shook his head with a straight face.

"This experiment, the knowledge and skills required, have been taught to you in the last lesson. ”

"The experiment lasted an hour and a half. ”

"I will be grouped according to the results, those who meet the standards will have my small experimental class tomorrow, and those who do not meet the standards will let Yiyun continue to make up the foundation for you until they reach the standard. ”

"You are all top people, and you must know that we are selecting the top of the top to communicate with the top people in the country on behalf of Jijing, so the big pot rice is not suitable for the current situation. ”

"Finally, I would like to stress once again that all the knowledge and skills you need have been taught to you. ”

"If you have the ability to excel, even if this is your first experiment, you can still achieve the results. ”

After that, he raised his arm and looked at his watch: "The experiment has begun, it is now three o'clock, and the report will be handed in before half past four." ”

Thundered......

The students dared to speak out but did not dare to scold.

Co-authored this old man is only going to teach him the players he likes?

The rest will be handed over to this half-senior sister?

What's even more terrifying is -

What was taught in the last class?

Some people are confused, some people are angry.

Someone, but they have already gone to the public laboratory table to grab the reagent.

Li Zheng and Wu Shu bore the brunt of the attack, and respectively grabbed the reagents needed for the first step.

"I'll get 50 milliliters of sulfuric acid, enough for the two of us. Li Zheng snatched the sulfuric acid bottle marked with a concentration of 25%.

Wu Shu took the opportunity to pick up the vial with the light yellow liquid: "Okay, is 40 ml of sodium hypochlorite enough for me?"

"25 is enough. ”

While the others were still reading the scrolls, the two had already poured the salt mud into the beaker.

Half a minute later, the rest of the people rushed to the test bench one after another, scrambling to pick up the reagents that the two had taken.

Hu Zengwu still didn't have any expression, pulled a chair and sat down, called Shen Yiyun next to him and said, "Li Zheng's reaction is fast and normal, what is Wu Shu's theory?"

Shen Yiyun quickly flipped through the materials: "Ninth." ”

"Sun Leyang taught?"

When Shen Yiyun heard this name, his voice softened, and he didn't dare to say more: "This ...... I don't know. ”

"Since it is attached to Renda, it must be Sun Leyang. Hu Zengwu smiled disdainfully, "Sun Leyang is a person like him, the level is not enough, and the scientific research circle can't get along, so he has to squeeze into the education circle, and he will enter the education circle. ”

"Yes...... Is it......" Shen Yiyun heard Hu Zengwu spraying Sun Leyang almost every month, and he had already formed a habit of conciliation.

According to the senior brother, it seems to be related to Hu Zengwu's emotional problems in his youth......

As for the specifics, no one knows.

After all, this is Hu Zengwu's absolute death hole, and he can't mention it.

It seems that Sun Leyang has hit the nail on topic again this year. After Hu Zengwu scolded enough, he shook his head again, "Yiyun, I don't mean to embarrass his students, that is, to say an objective fact, don't go out and talk nonsense." ”

"Don't say it...... Don't say it...... Shen Yiyun didn't dare to talk more, and hurriedly took out Shi Yang's materials, "It's rare for you to have kung fu, take a look at Shi Yang's previous results in advance, his father just sent it." ”

"Hmm. Hu Zengwu took the material, looked through it and said, "How is Shi Yang's situation?"

"Still in the hospital, Dean Zhou means that even if he can't come, try to keep him a place. ”

"Hmm...... Don't make a mess of this matter, it's Zhou Yi's business whether to give a quota or not, I should score as many points as I have here. Hu Zengwu put down the materials and said in a low voice, "This selection, so many parents and people in the system are watching, Shi Yang didn't come, so he was sent to the national referendum, who is responsible for the trouble?"

"Yes, I am sure of Shi Yang's experimental level, he is really, very good, at least no less than Li Zheng. ”

"I know, I believe in you. Hu Zengwu raised his hand and said, "Don't talk about this matter anymore." ”

Shen Yiyun frowned slightly, if the two heavyweight teachers strongly recommended Shi Yang, the Chemistry Society would have a reason to accept their opinions and recruit Shi Yang into the national decision, so she still wanted to fight for it again, so she gritted her teeth and said: "Teacher Hu, I can issue an evaluation report for Shi Yang, you can change it, and then jointly sign it with Dean Zhou and submit it to the Chemical Society, which should be able to help Shi Yang fight for it." ”

"Absolutely not. Hu Zengwu glared at Shen Yiyun, "Are you afraid that you won't cause trouble for yourself? In this room, which student doesn't have any family background? It's really entangled, and in the end, it's your report, he Zhou Yi is okay with his hand, how do you explain? We just take care of our own part and don't make trouble." ”

"Good ......" Shen Yiyun was unwilling to bow his head, and he didn't dare to say half a word.

She originally planned very clearly, if she persuaded Zhou Yi and Hu Zengwu to protect Shi Yang, the Chemical Society would most likely approve it, so as to make an exception to summon Shi Yang into the provincial team.

For this reason, she has already said a lot of good things in front of Zhou Yi.

But now it seems that although Zhou Yi has intentions, he has never seen Shi Yang, and he does not dare to be too resolute.

Hu Zengwu was wise to protect himself and forbade himself to speak for Shi Yang.

In this way, this chemopath, who threatens to go to Prague to perform the preparation of special substances to the world...... I'm afraid I'm going to collapse in the anorectal hospital.

Shen Yiyun was soft-spoken after all, and he couldn't say anything more, so he silently kept up with Hu Zengwu's pace and inspected the experiment together.

On Li Zheng's side, the kung fu of heating the solvent has already sorted out the experimental ideas in his mind.

Magnesium sulfate heptahydrate is extracted from salt sludge.

It's not so much about extracting what you need, it's about pumping out unwanted impurities.

After all, in industrial salt mud, in addition to the target element magnesium, there are also calcium, iron, aluminum, manganese and other chemical components.

In order to extract "magnesium", the salt sludge is first acidified to make a solution, and then the unwanted things in it are chlorinated and hydrolyzed into hydroxides, which are precipitated into solids, and then filtered in turn.

Eventually, the remaining magnesium is used to crystallize magnesium sulfate heptahydrate.

The process is many, but the principle is simple.

The core is only in one point - the pH level.

In this experiment, each substance to be filtered out will precipitate into a solid at different pH values.

As long as the theory is passed and the pH value of each substance is fully precipitated, the final result can always be very different.

However, if you are a novice experimenter, there is a high probability that you will only look at the steps of the paper and read from the script, and will not think deeply about the reaction of each step, so as to finely adjust the pH value.

Thinking of this, Li Zheng couldn't help but turn to Wu Shu and worry about her.

Wu Shu's progress was a little slower, and his movements were not so skilled, so it didn't seem that he had made up for the experiment.

Li Zheng suppressed his throat and said softly: "The pH of iron hydroxide is 3.2, and aluminum hydroxide is ......."

Wu Shu suddenly raised his hand, didn't look at Li Zheng, and said indifferently: "I can do it myself." ”

"But you've already been deducted points. Li Zheng said in a deep voice, "The time given by Hu Zengwu is very short, and there is no room for mistakes at all." ”

"I know, I can do it myself. Wu Shu lowered his head, carefully stirring the salt slurry, his face was even more cold than before, "If you do this again, I will be angry." ”

Seeing her appearance, Li Zheng finally nodded, and his attention returned to his experiment.

This guy also kept saying that Ou Xingzhuo valued self-esteem too much.

It's really fifty steps and a hundred steps.

At the same time, Hu Zengwu led Shen Yiyun to patrol back and forth, and from time to time he would explain to Shen Yiyun and ask her to record it in the notebook, as if she was deducting points.

Other than that, there is no guidance.

It is basically clear that the top of the sieve enters the small class.

Especially when he came to Wu Shu, Hu Zengwu stood behind her for a long time, recording a lot, as if he was waiting for her to make more mistakes.

Li Zheng only glanced at it and walked by.

Under the inspection of the two examiners, it was obviously just a simulation experiment, but it was like a final exam.

Since there are many experimental steps and they are very dense, the further you go, the quieter it becomes.

In the meantime, some people continue to make mistakes and ask for some salt mud from scratch, most likely because of the pH deviation.

In the regular exam, 20 points will be deducted for redoing the experiment, and considering the time issue, the preparation question can almost be declared 0 points.

This tense atmosphere lasted for nearly one hour.

What broke the atmosphere was a "tick" sound.

Many people are familiar with experimental equipment, and there is only one source of this sound -

Electronic balances.

Hearing this sound means that someone has made a product.

Follow the prestige.

Li Zheng was placing the surface dish containing a mass of white crystals on the scale, looking at the numbers and filling in the experiment report.

Most people had the same voice in their hearts.

Is this force again?

Damn the cobalt god, when are you coming, it's almost this kid, I can't stand it!

On Li Zheng's side, when he finished filling out the experimental report, Shen Yiyun and Hu Zengwu also came over.

After Hu Zengwu glanced at the electronic screen, he picked up Li Zheng's final report.

[Theoretical yield: 3.41g]

[Actual output: 2.78g]

[Actual yield: 81.5%]

"Yes. Hu Zengwu returned the report to Li Zheng with an expressionless face, "Take the things and go to the next door to do the content measurement, and the things you need are ready." ”

"Congratulations~" Shen Yiyun quietly raised his eyebrows.

When the surrounding students heard this, they already realized.

Li Zheng is forced to enter the small class.

Hu Zengwu's experimental small class, it must have been carefully cultivated and went to the national finance......

If you don't go in...... Then you can only let the unreliable senior sister tutor, no matter how you think about it, it is the life of cannon fodder.

No, we have to hurry.

Just when everyone was riveting and trying to fight.

It was still the old place, and a female voice came next.

Wu Shu walked to the table with the surface dish and blew his bangs: "Classmate, have you run out of balances?"

Li Zheng didn't expect Wu Shu to be so fast, looking at the white crystals in her hand, he was immediately overjoyed, and hurriedly moved his product: "Don't say anything, all hail." ”

Wu Shu smiled, ignored Hu Zengwu, and put his product on the scale.

Balance display –

【2.65g】

Seeing this result, Wu Shu exhaled relaxedly, and the result was recorded.

Li Zheng was shocked: "It's the first time you've done such a complicated experiment?"

"Sort of. Wu Shu quickly filled out the report and turned around and handed it to Shen Yiyun.

Shen Yiyun took the report, because he was sure that he had reached the standard, so he only glanced at it very perfunctorily, and asked, "Teacher Hu...... Can she ...... too?"

"Wait. Hu Zengwu didn't look at Wu Shu, he only raised his hand and said, "There are a lot of deductions for the experimental operation just now, let's go back first." ”

Li Zheng glared, this is going to go up to theorize.

Seeing this, Wu Shu hurriedly pulled him: "Okay, go over there and wait for me." ”

Shen Yiyun saw that the situation was wrong, and also stepped forward to push Li Zheng: "There will be a total score in the end, and Wu Shu has a great chance." ”

"A cloud. Hu Zengwu frowned and said, "Speak for me again?"

“......”

Hu Zengwu then turned to look at Li Zheng: "Take the product and prepare it quickly." ”

"......" Li Zheng glanced at Hu Zengwu, his heart was crossed, and he silently picked up his own product, "Wu Shu can't go to the small class at this level, so I won't go either, the big class will be the big class, it doesn't matter." ”

With that, he returned to his seat with the product, and instantly took out the latest volume of "Demon Slayer Blade" specially provided by Zhang Xiaoke from his schoolbag, and began to relax in place.

It wasn't until Li Zheng started flipping through the comics that Hu Zengwu reacted to what was happening.

What did you do with my class??

Do I still have the kung fu to teach you a middle school student?

Hu Zengwu's face tensed suddenly, and he roared out directly: "What do you mean?!"

The entire laboratory was startled and pulled their necks to watch the show.

What's the matter?

Anyway, how does Li Zheng look like comics?

Shen Yiyun saw that the situation was wrong, and hurriedly persuaded: "Teacher Hu, you are busy first, I'll go and tell him, probably because the young man is ...... righteousness."

"What kind of righteousness are you talking about? Did I say I won't let this girl go?" Hu Zengwu's face turned red, staring at Li Zheng, who was reading the comics, and waved his arm and said angrily, "This is not righteousness, it's a hero, how old are you, what do you have to do with each other?"

In the sudden angry scolding, Shen Yiyun trembled, and he didn't even dare to persuade him.

It was Wu Shu, who picked up his product and walked in front of Hu Zengwu.

The teacher was angry. Wu Shu was expressionless and said gently, "It has nothing to do with Li Zheng, the account is all on my head, anyway, it doesn't matter if I go to the finals or not." ”

After saying that, she also turned to leave, and in full view of everyone, she pulled the chair next to Li Zheng, knocked him on the head, and scolded with a smile: "Crazy!"

"Don't bother me reading comics. Li Zheng turned around and changed his angle.

Looking at Li Zheng like this, Wu Shu hid his face and smiled: "Don't be so cute." ”

"I'm a macho man, where is cute?"

"That's even cuter, haha. ”

They didn't know that the intimate chatter of no one on the side had angered Hu Zengwu even more.

"Okay, you two are doing well. Hu Zengwu shook his arms and looked at the rest of the students with a calm face, "There are still the last 20 minutes, hurry up." ”

Everyone looked at his terrifying face, and they didn't dare to say a word, and some of them pretended to be bored and continued the experiment.

In fact, he still couldn't help but glance at Li Zheng and Wu Shu.

Wu Shu: "Why does this woman have something in her mouth and say something?"

Li Zheng: "Don't make trouble, you don't understand comics at all." ”

People around you, listen to what you say and what I say.

Good gas.

Everyone was feeling angry.

Damn it......

Compared to this, Xiaoban is a ball.

Li Zheng has already won.

At this moment of common hatred.

A man he stood up.

He pulled out his gray shirt and pulled it over his belt.

He walked over to the common lab table with the tray.

He began to weigh.

That's when everyone's attention shifted.

The dog pack owner has also done it.

Hu Zengwu also looked at the electronic screen again: "2.63g, yes, go to the laboratory next door." ”

Shen Yiyun hurriedly picked up the notebook: "Ou Xingzhuo, right?"

"The stars of the stars, the scorching scorching. Ou Xingzhuo picked up the tray, turned to look at Hu Zengwu, and raised his glasses, "Teacher Hu, I need to remind you that Wu Shu is a gold medalist in the International Physics Olympiad, ranked second in the world, and is a first-class outstanding person anywhere on the planet, and she may not need your guidance at all." ”

"???" Hu Zengwu's whole face began to turn purple visibly, staring at Ou Xingzhuo, and he didn't say a word.

"In addition, my level is limited, so let's give the opportunity to cultivate by yourself to better students. Ou Xingzhuo finished talking, turned around and walked back to his position, pulled a chair and came to Li Zheng and Wu Shu's side, "Do you want me to read comics?"

The two-person squad thus becomes a trio.

It's still the top three trio in the class.

Hu Zengwu froze in place for a moment, and finally threw his arms angrily and rushed to the door of the laboratory.

"Who are you in this session? I don't care, you can do it yourself!"

"Teacher~~Don't Wow Teacher~~" While Shen Yiyun chased out, he didn't forget to turn his head to look at Li Zheng and blinked secretly.

I don't know why.

Thanks a lot!