Learning Demon Cultivation System

60%, 30 points.

And so on.

Looking at Cobalt, who is skillful in placing the condenser, Shen Yiyun finally became serious: "This kind of question, in terms of undergraduate standards, as long as the yield reaches 70%, it is considered excellent."

"That's 1.78 grams..." Li Zheng muttered, "We can compete for full marks, and the yield must be higher than 80%, which is... 2 grams."

"Basically impossible." Shen Yiyun shook his head confidently, "It's not that it's theoretically impossible, it's just that it's impossible for someone who does it for the first time, and it's very good if they can reach 70%. Ten times, constantly fine-tuning the dosage, time and temperature, pursuing the limit, and probably can find some ways to increase the production."

"Dosage, time, temperature..." Li Zheng couldn't help but said, "Isn't this just alchemy..."

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

"Hmm..." Hearing this, Li Zheng felt that he had finally touched the threshold of chemistry.

At this time, he looked at Shi Yang, who was concentrating on it, with an evil smile on his face.

Li Zheng seemed to see the Creator of a microcosm.

It turns out that this is the pleasure of chemistry!

Oh shit.

Hands start to itch.

I really want to do an experiment.

Chapter 134 Create ___ out of thin air for you

Shen Yiyun looked at Shi Yang, who was gradually becoming obsessed, with a disgusted look on his face, and turned to Li Zheng and asked, "Do you know what the score rate of this question was last year?"

Hearing this, Li Zheng quickly pressed his unicorn arm and said, "Well...follow the steps, how can we make 1 gram?"

"You think too much." Shen Yiyun glanced at Li Zheng, lowered his head, and shot his sharp eyes from the angle between the lens and the pupil, "Student Liucheng, the final product is 0."

"???" Li Zheng's spine shivered, "These are all people who participated in the finals, so all the 40 points will be lost?"

"Yes, by the way, I only scored 45 points in the experiment that year, which is also the National Fund." Shen Yiyun straightened his glasses, imitating his mentor when he pretended to beep, and explained coldly.

"For this experimental question, although the steps have been told to you, there is still room for blanks. Candidates need to judge the phenomenon by themselves and adapt to the situation."

"If you are not careful, it will cause side effects."

"If you're too conservative, you don't have enough productivity."

"Therefore, doing experiments is not a simple way of learning, but a double assessment of theoretical basis and on-the-spot experience."

"A mere expert in the examination will definitely be defeated by this."

"A score of 99 is no exception."

Li Zheng looked at Shi Yang without squinting all the time, deeply convinced of this.

This question only clarifies the dosage requirements for the two raw materials of salicylaldehyde and diethyl malonate. As for the subsequent catalysts, reactants and operations, it only gives a rough description.

Just like "a little dark soy sauce" in the recipe, "half a spoonful of sugar", "stir-fry on low heat for a while".

And this is the most important space to play.

Not only does the cook need to control the appropriate dosage, but he also needs to act on the spot and adjust the technique according to the cooking situation.

A little carelessness is a rotten dish.

In chemistry, there are also acidity and alkalinity, temperature, reaction, excess reaction, side reaction, and catalyst reaction to be considered. As long as one mistake is made, the product will be completely different, and in the end, everything will be lost.

While thinking about it, the God of Cobalt had already turned on the switch of the oil bath and started heating and reflowing.

The oil bath is a heater similar to an oven, which is used to complete the reaction that needs to be heated in the experiment.

But this kind of reaction will cause evaporation, which will lead to the loss of the experiment.

Therefore, it is necessary to place a condenser tube on the beaker to allow the vapor to condense into drops and flow back into the bottle.

This process usually takes more than half an hour. The experimenter only needs to fix the knob on the oil bath at a certain temperature, and then prepare for other things.

But the cobalt gods didn't.

He held the knob with his right hand, raised his glasses with his left hand, and stared at the liquid in the beaker.

Time passed by minute by minute.

The test solution tends to boil quickly.

At this moment, Cobalt God finally carefully turned the knob to control the temperature drop.

But after calming down a little, he fine-tuned the temperature and heated it again.

Li Zheng stared.

Isn't this the roast duck chef of Quanjude?

During the hesitation of luck, Shen Yiyun commented softly: "He is fighting for time."

"Why do you know?" Li Zheng humbly asked for advice.

"Let me ask you, what will happen if the temperature is too high and the backflow is severe?" Shen Yiyun asked.

"Flooding." After all, Li Zheng is the man who memorized the entire recipe, and quickly replied, "Fluid will be produced, which will reduce the reaction efficiency and even cause side effects."

"Very good, so in this experiment, when heating and reflowing, it is recommended to use a temperature of about 80° to control the reflow rate within a safe range." Shen Yiyun smiled, "Ke Shiyang is obviously playing with fire. Stuck on the critical point of flooding, complete the reaction as quickly and efficiently as possible.”

Li Zheng nodded and said: "It's like when cooking noodles, you have to turn on the fire, thinking that you can control the person who just doesn't silt the pot."

"That's a good metaphor..." Shen Yiyun narrowed his eyes and raised his glasses, "But they're all bruised."

"Shh." Cobalt God raised his hand and made a gesture to stop the sound.

"Uh..." Shen Yiyun gritted his teeth and stared.

Keep improving, I understand.

But you kid, you think you are smart, and you made a big mistake just now.

Wait for the finished product to see if you can still laugh!

Li Zheng didn't think so much, he just tried to absorb the student movement.

For the rest of the time, Cobalt, just like Li Zheng in brushing the questions, concentrated his attention and didn't say a word.

Precipitate crystals, filter with suction, wash with ethanol, recrystallize...Add sodium hydroxide, heat to reflux again...Pour the reactants into concentrated hydrochloric acid water...

Each of these processes has artistic beauty, chemical frenzy, and Shi Shisao operation at the same time.

Even if he couldn't absorb the student movement, Li Zheng would definitely watch it intently.

Three hours just passed.

After repeated crystallization and suction filtration, it finally entered the drying process.

In the end, a large lump of white massive granular crystals was obtained.

After putting the finished product on the tray, Cobalt God smiled magically, stepped back half a step, returned to Shi Yang's state, raised his hand and said, "Please."

Only then did he realize that Shen Yiyun had disappeared.

It turned out that he had fallen asleep on the table next to him.

"Hey, this invigilator..." Shi Yang immediately turned to Li Zheng.

This guy didn't take his eyes off it, he was still watching with great enthusiasm, and he was still breathing desperately.

Shi Yang then walked around the test bench and stepped forward to persuade him: "Brother, I can't smell it, and it's not good to smell too much of this thing."

"Oh, it's over?" Li Zheng closed his eyes and took a short rest.

【Student Movement: 7.8】

Abundant harvest.

Not only the experimental skills, but also many mysterious comprehensions. I feel like I have a lot of experimental inspiration after reading it. In short, it is very itchy.

Seeing Li Zheng's appearance, Shi Yang also laughed: "There are many types of coumarin, and this kind of coumarin-3-carboxylic acid is actually not necessary. I can probably think of seven or eight ways to make it. In our experiment, there are many reagents that can be replaced with other ones, if not for the reagent restrictions, I can make several perfumes for you on the spot."

"Wonderful." Li Zheng couldn't help sighing, "Where did you get so much inspiration?"

"Oh, there's nothing new about it. It's like playing with Lego. If you play a lot, you can spell out anything." Shi Yang gestured, "At the beginning, I saw chemistry, which is colorful. Solid-liquid-gas changes back and forth. Explosions are very interesting, and then I really started to do it... I found out that I was playing with elements and molecules, bonds and rings."

Shi Yang waved his hands again as he spoke: "Oh, it's meaningless to say these things. I had the opportunity to tell the girls in our class several times that I wanted to introduce some girls to our Huajing circle, but they all ran away..."

"Talk, talk, I'll listen, I love to listen." Li Zheng began to take a big breath again.

"You've already entered the circle..." Shi Yang felt disgusted, "And you're not a girl..."

"Damn it, don't be so preoccupied with sex and despise friends." Li Zheng scolded on the spot, "We use a piece of toilet paper for friendship, can a girl do this with you?"

"That's...that's true..." Shi Yang couldn't refute after all, so he continued to gesture, "The fun part is that in the microscopic world, these small parts are disassembled and assembled at will, and the assembled things are still the same every time. They are different. There are still many things that can be assembled in theory, but no one has succeeded, and there are even things that should not be assembled in theory, but can be produced inexplicably, and I feel that this life is not enough at all.”

Li Zheng said blankly, "Does it feel like the creator of the microcosm?"

"Hehe, I was a little bit when I was young, but the more I know, the more I am in awe." Shi Yang suddenly became shy again, wiped his nose and said with a smirk, "It's almost an adventurer."

Hearing this, Li Zheng absorbed the student movement and sighed, "I'm ashamed to say, I've never had the experience you mentioned, Brother Shi, and I don't know if it's a difference in talent or a difference in realm."

"It's not your fault, it's all the textbook's fault." Shi Yang scolded immediately, "Look at the high school textbooks, are they written for people? You'll be asked to memorize them as soon as they come up. Why is there water but no alcohol..."

When Shi Yang said this, he stuttered.

"Alcohol is dehydrated into olefin." Li Zheng pointed out embarrassingly, "Three ratios of sulfuric acid to ethanol?..."

"My mother...you have worked too hard to memorize these." Shi Yang continued to scold, "If you want to learn chemistry, you must first appreciate the charm of chemistry before you learn it. It's like you have never even heard music, so you just try to learn it Music theory, I want you to memorize the score or something, what a shame."

"That makes sense." Li Zheng murmured, "Then how do you appreciate the charm of chemistry?"

"Hey~" Shi Yang smiled without saying a word.

Li Zheng was a little scared: "Even if the sodium is enough, the latrine is not enough."

"Just kidding, the experiment is right, it's better not a propositional experiment, but an experiment that can be played freely." Shi Yang became more and more excited as he said, "For example, I can use the instruments and materials in this room to create you out of thin air. Shit, do you believe it or not?"

"I... I believe..."

Seeing Shi Yang's frenzied appearance, Li Zheng gradually felt that perhaps what drove him to study chemistry was not the charm of chemistry, but an obsession with a certain substance.

Damn, I don't dare to take this luck.

On the other side, Shen Yiyun was finally woken up, and looked at his watch in a daze.

"Ah! There's no food in the cafeteria!" She got up in a panic, put on her glasses and walked over, pretending to be a teacher, "Oh... finished, um... have you been waiting for a long time?"

"It's okay." Shi Yang immediately avoided Shen Yiyun's gaze, burst into a strong smile, and waved his arms in an air, "It doesn't matter if it's volatile, it's enough."

"It's not up to you whether it's enough or not." Shen Yiyun pulled himself together as much as possible, walked around to the test bench, and looked at the plate of white crystals.

His expression also became flustered.

Why so many?

She raised her glasses and asked, "Did salicylaldehyde be added in the follow-up test?"

"No." Li Zheng said, "I didn't close my eyes the whole time. I didn't touch a single drop of the two raw materials, salicylaldehyde and diethyl malonate."

"Well...then... let's weigh..." Shen Yiyun put on his gloves, carefully picked up the watch glass with both hands, put it on the electronic scale, then squatted down halfway, and aimed at the display screen.

Immediately afterwards, she shivered.

Chapter 135 Is This Also In Your Calculation?

"Did you forget to buckle the quality of the watch..." Shen Yiyun raised his glasses in a panic, pressed the electronic scale a few times, then swallowed, and looked at the display screen again.

The trembling became more intense.

His expression became tighter as well.

"This...impossible...how could there be so much..." Shen Yiyun stood up tremblingly, and asked Shi Yang, "You obviously added an extra milliliter of piperidine, am I wrong?"

"Okay." Shi Yang still didn't have the courage to look directly at the elder sister, and only showed his plump side face for the elder sister to admire, "But it's not an extra milliliter, but 0.78 milliliter."

Shen Yiyun scratched his head in shock and said, "Each drop is 0.05ml, how could you be accurate to 0.01!"

"Otherwise, what are you using the high-precision syringe for?" Shi Yang then aimed at the syringe on the table, "Within 0.5ml, I can do it with my hands."