Shen Yiyun looked at Shi Yang, who was gradually becoming enchanted, but he looked very annoying, and turned to Li Zheng and asked, "Do you know what the scoring rate of this question was last year?"

When Li Zheng heard this, he hurriedly pressed his unicorn arm and said, "Hmm...... If you follow the steps, you can make 1 gram, right?"

"You're thinking too much. Shen Yiyun glanced at Li Zheng, lowered his head, and his sharp eyes shot out from the angle between the lenses and his eyes, "Sixty percent of students, the final product is 0." ”

"???" Li Zheng felt a chill on his spine, "These are all people who participated in the finals, and all the 40 points are gone?"

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

"Although the steps of this experimental question have been told to you, there is still room for blank space, and candidates need to judge the phenomenon by themselves and adapt to the situation. ”

"The slightest mistake can trigger side effects. ”

"If you are too conservative, you will not have enough yield. ”

Therefore, doing experiments is not a simple learning formula, but a double assessment of theoretical foundation and field experience. ”

"A simple test expert will inevitably fail because of this. ”

"99 points is no exception. ”

Li Zheng always looked at Shi Yang without squinting, and he thought deeply of it.

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

Just like the recipe "dark soy sauce a little", "half a spoon of sugar", "stir-fry for a while".

And this is the most important space to play.

Not only does the chef need to control the right dose, but he also needs to play on the spot and adjust the technique according to the cooking situation.

If you're not careful, it's a rotten dish.

In chemistry, there are also acidity and alkalinity, temperature, reaction, excess reaction, side reaction, catalyst reaction, as long as one mistake is made, the product will be completely different, and eventually the whole plate will be lost.

Thinking about it, the cobalt god had already turned on the oil bath switch and began to heat and reflux.

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

However, this reaction will cause evaporation, which will lead to experimental attrition.

Therefore, a condenser tube needs to be placed on the beaker to allow the vapor to condense into drops that will flow back into the bottle.

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

But the Cobalt God didn't.

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

Minutes and seconds passed.

The test solution soon had a tendency to boil.

At this time, the cobalt god finally carefully twisted the knob to control the cooling.

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

Li Zheng's eyes widened.

Isn't this all Jude's roast duck cook?

Between his luck, Shen Yiyun commented softly: "He is competing for time." ”

"How can you see it?" Li Zheng humbly asked for advice.

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

"Liquid pan. After all, Li Zheng was the man who memorized the entire recipe, and quickly replied, "It will produce fluid accumulation, which will reduce the reaction efficiency and even cause side reactions." ”

"Very good, so in this test, when doing heating reflux, it is recommended to use a temperature of about 80° to control the reflux rate within a safe range. Shen Yiyun said with a smile, "But Shi Yang is obviously playing with fire, trying to get stuck at the critical point of the liquid pan state, and complete the reaction as soon as possible and effectively." ”

Li Zheng nodded and said: "It's like when you cook noodles, you have to turn on a big fire, thinking that you can control people who just don't clog the pot." ”

"This metaphor is so good...... Shen Yiyun's eyes narrowed, and he also raised his glasses, "But they are all bruised." Mobile:

"Shhhh The cobalt god raised his hand and made a silent gesture.

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

Keep improving, I know.

But you kid, you're smart, and you've just made a big mistake.

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.

In the next time, Cobalt God was like Li Zheng in the question, concentrating and not saying a word.

Precipitation crystallization, suction filtration, ethanol cleaning, recrystallization...... Add sodium hydroxide and reheat again...... Pour the reactants into concentrated hydrochloric acid water......

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

Even if he can't absorb the student movement, Li Zheng will inevitably watch it intently.

Three hours passed.

After crystallization and filtration again and again, it finally enters the drying process.

Eventually, a large lump of white lumpy granular crystals was obtained.

After putting the finished product into the tray, the cobalt god smiled demonically, took half a step back, returned to Shi Yang's state, and raised his hand and said, "Please." ”

Only then did he realize that Shen Yiyun was gone.

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

"Eh, this invigilator ......" Shi Yang immediately turned to look at Li Zheng.

This guy couldn't take his eyes off it, he was still looking at it quite vigorously, and he was still inhaling desperately.

Shi Yang bypassed the test bench and stepped forward to persuade: "Brother, you can't smell it, and this thing, it's not good to smell too much." ”

"Oh, it's over?" Li Zheng closed his eyes and rested a little.

[Student Movement: 7.8]

The harvest is abundant.

Not only experimental skills, but also a lot of mysterious comprehension, I feel that after reading it, I also have a lot of experimental inspiration, in short, it is very itchy.

Shi Yang looked at Li Zheng's appearance and laughed: "There are many types of coumarin, like this coumarin-3-carboxylic acid, in fact, it is not necessary to do this, I can probably come up with seven or eight preparation methods, our experiment, there are many reagents that can also be replaced with others, if it is not for the reagent restrictions, I can make a few perfumes for you on the spot." ”

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

"Oh, in fact, there is nothing new, it's like playing Lego, if you play too much, you can spell out anything. Shi Yang gestured, "At the beginning, I saw that chemistry was colorful, and the solid-liquid gas was converted back and forth, and it would explode, which was very interesting, and then I really started to do it...... Only to find out that it is playing with elements and molecules, bonds and rings. ”

Shi Yang said and waved his hand again: "Oh, it's not interesting to say this, I have had the opportunity to talk to the girls in our class several times, and I want to introduce some girls to our competition circle, but everyone ......runs away."

"Speak, speak, I listen, I love to listen. Li Zheng began to inhale heavily.

"You're already in the circle......" Shi Yang was a little disgusted, "And you're not a girl......"

"Damn, don't be so sexually despised by friends. Li Zheng scolded on the spot, "Let's use a piece of toilet paper to make a friendship, can my sister do this with you?"

"This ...... It's also ......" Shi Yang couldn't refute it after all, so he continued to compare, "The fun thing is that in the microscopic world, these small parts are disassembled and assembled at will, and the things that come out are different every time." There are still many things that can be assembled theoretically, but no one has succeeded yet, and there are even things that should not be assembled in theory, but can be inexplicably assembled, and it feels like it is not enough in this life. ”

Li Zheng said dumbfoundedly: "Does it feel like a microcosm creator?"

"Hehe, there were some when I was a child, but the more I understood, the more awe-inspiring I became. Shi Yang suddenly became shy again, wiped his nose and smirked, "It's almost the same as saying that he is an adventurer." ”

When Li Zheng heard this, while absorbing the student movement, he sighed: "I'm ashamed to say it, Brother Shi, I have never had the experience you said, and I don't know if it's the gap in talent or the gap in realm." ”

"It's not your fault, it's all the textbook. Shi Yang immediately scolded, "You read the high school textbook, is that written for people? As soon as it comes up, I will let you memorize it, what water is not alcohol......

When Shi Yang said this, he stumbled.

"Alcohol dehydrated into alkene. Li Zheng awkwardly said, "Ethanol sulfate is three to one?......"

"I'm Nima...... You're trying too hard to memorize that. Shi Yang then scolded, "If you want to learn chemistry, you must first appreciate the charm of chemistry and then learn it, it's like you haven't even heard music, so you have to learn music theory, and you have to memorize music scores or something, this is a hairy memorization." ”

"Quite a point. Li Zheng muttered, "Then how can you appreciate the charm of chemistry?"

"Hehe~" Shi Yang smiled and said nothing.

Li Zheng was a little afraid: "Even if the sodium is enough, the thatched house is not enough." ”

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

"I ...... I believe ......"

Looking at Shi Yang's fanatical appearance, Li Zheng gradually felt that perhaps what drove him to study chemistry was not the charm of chemistry, but his dedication to a certain substance.

This luck, I don't dare to take it.

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

"Ahh......h It's done, huh...... Waiting a long time?"

"It's fine. Shi Yang immediately avoided Shen Yiyun's gaze, bloomed with a strong smile, and waved his arms angrily, "The volatilization point is not tight, it is enough." ”

"It's not for you to say it's enough. Shen Yiyun tried his best to cheer up, walked around to the experimental table, and looked at the white crystal.

His expression also became panicked.

Why are there so many?

She raised her glasses and asked, "Salicylaldehyde was added to the follow-up test?"

"Nope. Li Zheng said, "I didn't close my eyes the whole time, and I haven't touched a drop of the two raw materials of salicylaldehyde and diethyl malonate." ”

"Hmm...... That...... Then weigh it......" Shen Yiyun put on gloves, carefully picked up the surface dish with both hands, put it on the electronic scale, and then half-squatted down and aimed at the display screen.

Immediately after, she shuddered.