Chapter 134

Shen Yiyun looked at Shi Yang, who was gradually possessed by demons. However, he turned to Li Zheng and asked, "do you know what the scoring rate of this question was last year?"

Hearing this, Li Zheng pressed his Kirin arm and said, "well How can one gram be produced by following the steps? "

"You think too much." Shen Yiyun glanced at Li Zheng, his head lowered, and his sharp eyes shot out from the angle between the lens and the eyes. "60% of the students, the final product is 0."

“？？？” Li Zheng's back spine a cool, "this can all participate in the final finals of the people, these 40 points are all gone?"

"Yes, by the way, I got only 45 points in the experiment that year, which is also the national gold medal." Shen Yiyun righted his glasses, learning from his tutor's appearance when installing beeps, and explained coldly.

"Although you have been told the steps of this experimental question, there is still room for blank space. Candidates are required to judge the phenomenon by themselves and adapt to circumstances."

"A little carelessness can cause side effects."

"If it is too conservative, the yield will be insufficient."

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

"The pure examination expert, will certainly therefore defeat."

"99 is no exception."

Li Zheng has always looked at Shi Yang, which is deeply felt.

As for malonaldehyde and salicylic acid, the following two operations are described.

As in the recipe "a little soy sauce", "half a spoon of sugar", "stir fry for a moment with a small fire".

And this is the most important space to play.

Not only need the cook to control the appropriate dosage, but also play on the spot, according to the cooking situation to adjust the technique.

A little carelessness is a rotten dish.

In chemistry, we have to consider the 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 the final product will be lost.

In the meantime, the God of cobalt has turned on the switch of the oil bath and started heating and refluxing.

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

However, this reaction will cause evaporation, resulting in experimental loss.

Therefore, it is necessary to place a condenser tube on the beaker to condense the steam into drops and return it to the bottle.

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

But cobalt didn't.

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

Time goes by.

The test solution soon tends to boil.

At this point, the God of cobalt finally turned the knob carefully to control the temperature.

It can be slightly smoothed down, and he adjusts the temperature.

Li Zheng glared.

Is this not Quanjude's roast duck cook?

"He is fighting for time," Shen Yiyun commented softly

"Why?" Li Zheng asked for advice with an open mind.

"I ask you, what happens when the temperature is too high and the reflux is intense?" Shen Yiyun asked.

"Flooding." Li Zheng, after all, is a man who has memorized the whole menu, and quickly replied, "it will produce effusion, which will reduce reaction efficiency and even cause side effects."

"Very good. Therefore, in this test, when heating and refluxing, it is recommended to use about 80 ° temperature to control the reflux speed in a stable range." Shen Yiyun said with a smile, "but Shi Yang is obviously playing with fire, trying to get stuck in the critical point of flooding state and complete the reaction as soon as possible and as effectively as possible."

Li Zheng nodded and said, "it's just like people who have to turn on a big fire when cooking noodles, thinking that they can control the pot just now."

"This metaphor is good..." Shen Yiyun's eyes narrowed and lifted his glasses, "but they were all silted up."

"Shh." Cobalt God raised his hand and made a gesture of closing the voice.

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

I understand.

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

Wait for the finished product, see if you can laugh out!

Li Zheng didn't have so much thought, just tried to absorb the learning movement.

In the following time, the cobalt God was as attentive as Li Zheng's brush, and did not say a word.

Precipitation crystallization, filtration, ethanol cleaning, recrystallization Add sodium hydroxide, reheat and reflow Pour the reactant into concentrated hydrochloric acid water

All of these processes have the aesthetic feeling of art, chemical fanaticism and the operation of Shi's Sao.

Even if he can't absorb the academic movement, Li Zheng will certainly keep his eyes on it.

That's three hours.

After crystallization and filtration again and again, it finally entered the drying process.Finally, a large amount of white bulk grain crystals were obtained.

After putting the finished product into the tray, cobalt God just smiled magic, and stepped back half step back to the state of Shiyang. He raised his hand and said, "please."

He found out that Shen Yiyun was gone.

It turned out that I was sleeping on the table next to me.

"Well, this is the test..." Shiyang then turned to Li Zheng.

This guy is still looking, still very exciting, still desperately breathing in.

"Brother, I can't smell it, and it doesn't smell well if it's too much," he said

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

[academic transport: 7.8]

rich harvest.

Not only experimental skills, but also a lot of mysterious understanding, feeling to see it, I also have a lot of experimental inspiration, in short, very itchy.

Shi Yang looked at Li Zheng's face and laughed. "There are many kinds of coumarins, such as coumarin -3- carboxylic acid. In fact, it is not necessary to do so. I can probably think of seven or eight kinds of methods. We have many reagents to replace them in this experiment, or the reagent limit. I can make you some perfume on the spot."

"Wonderful." Li Zheng couldn't help but sigh, "where did you come so many inspiration?"

"Ah, in fact, there is nothing new, just like playing high, playing more, everything can be spelled out." "At first, seeing chemistry is colorful. It will be interesting to see the solid-liquid gas changing back and forth and explode. Later, it really starts to do it Only to find out that the game is elements and molecules, bonds and rings. "

"Oh, it's not interesting to say that. I have had a chance to talk to our class girls several times, and I want to introduce some sister into our race circle, and they all ran..."

"Speak, speak, I listen, I love to hear." Lizheng began to breathe in again.

"You're in the circle..." Shi Yang has some dislikes, "and you are not a sister..."

"Mom, don't be so heavy on friends." Li Zheng scolded on the spot, "we are using a toilet paper to make love. Can my sister do this with you?"

"Here But it's also... " After all, Shi Yang can not refute, and this continues to compare, "the interesting place is that in the micro world, these small parts are disassembled and assembled randomly. The things assembled each time are different. There are many things that can be assembled theoretically, but no one has succeeded, even things that can not be assembled in theory but can be out of the question. It is not enough for me to feel that this life is not enough. "

"Is there a sense of the creator of the micro world?" Li Zheng said in a stupidity

"Ha ha, when I was a kid, the more I understood, the more awe I was." "Shi Yang suddenly and shy up, wipe the nose giggle way," said is adventurer is still similar. "

Li Zheng, hearing the words, sighed as he learned the fortune and said, "I am ashamed. I have never experienced the experience you said, and I don't know whether it is the gap between talents or the gap of realm."

"It's not for you, it's all for the textbooks." "You read high school textbooks, is that for people to write," Shi Yang immediately scolded? Let you back as soon as you come up, what has water and no alcohol... "

Shiyang said that, unexpectedly kowtow.

"Alcohol dehydrates to olefins." Li Zheng said awkwardly, "ethanol sulfate is three to one..."

"I NIMA You're too hard to carry that. " "To learn chemistry, first understand the charm of chemistry and then learn it, it seems that you have not heard music, you have to learn music theory, and you have to memorize music and other things. This is a hair."

"It makes sense." "How can I understand the chemical charm?" Li Zheng muttered

"Hey hey ~" Shi Yang laughed and said nothing.

Li Zheng was afraid: "even if sodium is enough, the cottage is not enough."

"Jokingly, the experiment is right. It is better not a proposition experiment, it is an experiment that can be freely played out." The more excited is Shi Yang, "for example, I can use the instruments and materials in this room to make shit for you from the sky, do you believe it or not?"

"I I believe... "

Looking at the crazy appearance of Shi Yang, Li Zheng gradually felt that what drove him to learn chemistry was not the charm of chemistry, but his persistence in some kind of material.

This is a lucky thing. Mom doesn't dare to take it.

On the other hand, Shen Yiyun was finally awakened and looked at the eye watch in a daze.

"Ah! There's no food in the canteen! " She got up in a hurry, put on her glasses and came up, pretending to be a teacher. "Oh It's done, um Wait a long time? "

"It's OK." Shi Yang immediately avoided Shen Yiyun's eyes, and burst out the smile of the strong, and waved his arms with his spirit. "The volatilization point is not tight, enough."

"It's not enough for you to say." Shen Yiyun tried to play his spirit and went around the experimental table and looked at the white crystal.

The look also followed.

Why so many?She raised her glasses and asked, "is salicylaldehyde added to the follow-up tests?"

"No Li Zheng said, "I didn't close my eyes all the way. I didn't touch a drop of Salicylaldehyde and diethyl malonate."

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

Then she shivered.

www.novelhall.com , the fastest update of the webnovel!