Lovely Allergen

The self-heating rice was getting louder and louder, Le Zhishi turned his face away and lip-synced to Jiang Yufan, "Why does this still have sound??"

Jiang Yufan shook his head frantically, and lip-synced gestures with him, "I don't know either..."

Hu Xuan in the front seat turned around, raised her hands and crossed herself with a mournful expression.

But Song Yu seemed to be cut off from the world, and he didn't respond. He even drew half a mind map on the blackboard.Behind him, the whole class performed a wonderful pantomime with suffocated laughter. The only accompaniment was the sound of self-heating rice, which was comparable to the increasingly passionate symphony in the golden hall.

Not only that, but the experience is 4D, with hot white mist wafting from the drawer of Lezhishi, and the aroma of fish-flavored shredded pork.

Originally, I wanted to have a secret meal, but now, the whole class, including Song Yu, the leader, knew that he was cooking.

Le Zhishi gave up completely, and the scene of himself being scolded and ordered to be kicked out of the classroom, and then squatting in the corridor to eat sadly appeared in his mind.

He feels that he is a very experienced person now, and he can go to Zhihu to answer the question "what is the experience of social death" anonymously.

Finally, after 10 long minutes passed, Song Yu turned around expressionlessly, and put the unused half of chalk on the desk, "This is what I'm going to say next."

The sound of the self-heating rice began to sound like a deflated balloon, and the sound became more and more wimpy, exactly the same as Le Zhi's head hanging down on the table at this time.

"The first part, find your weakest link, you all understand the barrel effect." Song Yu went down the podium as expected.

The students under the podium hurriedly put away their mobile phones row by row, and the students in the front turned to look at Le Zhishi with the mentality of watching a play.

It is rumored that the person who bullied the younger brother came to lead the class, so he caught his younger brother stealing food in class, and if he didn't teach him a lesson, he couldn't justify it.

"Systematically sorting out wrong questions is an effective method. Mistakes are not terrible. Everyone makes mistakes. It is terrible that many mistakes will be repeated, which will eventually lead to loss of points. So what you should do is to reduce the frequency of the same mistake."

In the words, he had already walked to Le Zhishi's side, and his slender hands seemed to be unintentionally propped on his desk.

He speaks at a steady pace and logically, from sorting out wrong topics to the skills of scoring multiple choice questions in mathematics, such as the combination of graphics, substitution, etc., as an ostrich, Kelezhishi, except for the sound of his own heartbeat , can't hear anything.

Song Yu seemed to be deliberately torturing him, so he stood beside him and talked, not going anywhere.

"...This is the multiple-choice part. Now you can use the questions at hand to practice the multiple-choice skills just mentioned, 10 minutes." After speaking, Song Yu finally lowered his head and looked at Lezhi who had been pretending to be dead. , tapping the table lightly with bent knuckles.

Only then did Le Zhi raise his head pitifully, with an expression that I really knew I was wrong, and honestly took out the self-heating rice box hidden in the drawer.

Song Yu raised his eyebrows and said in a low voice, "Is it fragrant?"

Hearing this sentence, several students around couldn't hold back their laughter.

"It's okay." Le Zhishi replied very honestly, and added in a low voice, "It's a bit fragrant."

Jiang Yufan is a loyal person. Seeing that Song Yu was in trouble, he immediately explained to him, "Senior, I bought this one. I bought it wrong. Blame me. I can write a review."

Seeing that he wanted to take responsibility, Le Zhi immediately said, "No, I want to eat it myself."

Zhang Chen didn't think it was a big deal to watch the excitement, "Senior, I can prove that it was eaten when I was happy. They had been secretly discussing it for a long time before, and they just wanted to eat self-heating rice during evening self-study."

Jiang Yufan was very angry, "Are you qualified to say it? It's like you haven't eaten takeaway for your evening self-study. And he didn't plan to eat it in the classroom."

The two started arguing, and Song Yu's eyes swept across the laughing students. Everyone seemed to be looking forward to his punishment. Finally, he opened his mouth expressionlessly.

"Take this opportunity to tell everyone the principle of self-heating rice."

Zhang Chen's face is full of disbelief, this is completely different from the direction he thought of in order to register and punish the three companies.

Not paying attention to the whispered discussions of the students around, Song Yu picked up the lunch box on the table, "Look here."

"The bottom layer of the self-heating rice box has a heating pack, which contains chemical agents such as quicklime, sodium carbonate, and aluminum-magnesium mixture. Quicklime is also calcium oxide, which reacts with water to form calcium hydroxide and releases a lot of heat. Carbonic acid Sodium tends to play a supporting role in it, and aluminum magnesium powder can also release heat through oxidation reactions. So when we inject water, the heating pack will work and automatically heat the food."

He lowered his head, met Le Zhishi's surprised eyes, and continued: "However, this kind of self-heating instant food also has the possibility of explosion, and the food is not fresh enough. It is not recommended for everyone to eat it frequently."

After finishing speaking, Song Yu put down the lunch box and pointed to the blackboard, "I have written several related reaction equations in the lower right corner of the blackboard. Interested students can take a look."

Lezhi looked at the equation on the blackboard.It turned out that he already knew what happened at that time, and he wrote it down calmly.

At the beginning, everyone just thought it was funny and wanted to see the excitement, but they didn't expect the social death incident to mutate the chemistry class, and they were a little confused.The amazing thing is that they have learned some of these reactions before, but they have never connected them to their lives. Compared with this, they have a kind of magical feeling.

"Based on the example just now," Song Yu leaned against Le Zhishi's table, "Everyone should never forget that calcium oxide reacts exothermicly with water."

Everyone laughed at the same time, but Zhang Chen was obviously still unwilling. He raised his hand with a mean expression on his face, "Senior, why is there a sound? It's so funny."

This is obviously to bring everyone's attention back to the time when the self-heating rice was sizzling just now.

Song Yu leaned against the table, and did not answer directly, but looked at other students, "You must have done chemical experiments. Can anyone tell me which chemical experiments you have done have special sounds?"

A girl whispered, "Sodium and water..."

Song Yu nodded to her affirmatively, "This example is very classic, many chemical reactions will make sounds." He took a special look at Zhang Chen who asked the question deliberately just now, "There is nothing to make a fuss about."

Zhang Chen couldn't hold back very quickly, and he clearly felt a hint of sarcasm in the other party's cold tone.

"Except for the reaction itself, a large amount of water vapor will be produced during the exothermic process, and there will be a sound under impact. This process includes many reactions similar to primary batteries, which you have not learned so far."

Song Yu lowered his head and glanced at him, "I believe... If Le Zhishi had understood the principle behind this from the beginning, he would not have chosen to heat self-heating rice in a quiet environment."

Le Zhishi's classmate.

This title sounded weird when I was happy to know it, but for some reason, it evokes a tinge of joy.

Although Song Yu still had a cold expression, it didn't mean to blame him.It is clear that every sentence is to popularize chemical knowledge, but everyone can hear the hidden meaning of excuse.

Le Zhishi thought, now the bottom of his anonymous answer can be updated in real time with the sentence "I am alive again!", no, he can even cancel his anonymity.

While he was in a daze, a broad palm fell on his head, rubbing his fluffy and soft hair very briefly and lightly.He didn't react, only felt the hand leave the top of his head, but left a word.

"If you don't eat it, it will be cold."

The head-touching came so suddenly that the students around were a little surprised.

The so-called rumors that the relationship between brothers is very bad, under Song Yu's extremely rare close contact, it was self-defeating.

Le Zhishi didn't lift her head, "I'm going out to eat."

After he finished speaking, he took the lunch box and walked out, a little bit hand in hand.

The lavatory is on the right side of the stairs, next to the lavatory, and I slipped in when I saw no one.The taste of convenience food is mediocre, the rice is hard and the dishes are a bit too salty.

He was in a daze while chewing, and after swallowing, he raised his hand in a dazed way, touched the top of his head, bowed his head and took another big mouthful.

He was so hungry that he didn't even feel hungry, and what happened just now happened again, Le Zhishi couldn't eat enough, thinking about what Jiang Yufan said he wanted to taste, he didn't leave after eating.But the little Jiang Yufan has been through too much, he can't remember anything, and he didn't come after waiting for 5 minutes.

Song Yu was still in class, and Le Zhishi didn't want to smear ink for too long, so she cleaned up and went back to the classroom.When he arrived at the door, Song Yu was standing on the podium, talking about the English review plan. He stood at the door and called out a report softly, but didn't go in directly.

Hearing the voice, Song Yu nodded to him, and continued talking as if nothing had happened.

Lezhi returned to his seat quietly and listened to the lecture with other students.After the whole class, Song Yu, who didn't bring any materials, only spent 10 minutes to sort out the context of the mind map, and then led everyone through it with clear thinking, and the degree of ease even surpassed many teachers.

"Time is limited, so let's talk about this." Song Yu stood sideways, looked down at his watch, and was about to start the first evening self-study.

"Happy time."

Hearing his name being called, Le Zhi was stunned for a moment, then quickly raised his head to look at his brother.

Song Yu nodded his chin in the direction of the blackboard, "Wipe the blackboard."

Le Zhi immediately nodded obediently, "Yeah." As he spoke, he was about to stand up.

From childhood to adulthood, what Lezhishi feared the most was that Song Yu ignored him, especially after he did something wrong, but if Song Yu taught him a lesson, or gave him something similar to punishment, it would mean that he was not angry .

Song Yu couldn't speak when he was really angry.

They all know each other well enough.

"Don't erase it," the girl who took the notes looked up. She didn't listen much when she was explaining before, but now she is rushing to copy the blackboard writing, "I haven't finished copying it yet."

Song Yu glanced lightly, "Since the mobile phones you bring can chat, they should also be able to take pictures."

Everyone was choked by this sentence, especially those who were gossiping and watching jokes in the group just now.

The get out of class bell rang, and Song Yu left the classroom.Le Zhishi wiped the blackboard according to what he said, Jiang Yufan showed his loyalty and took another blackboard eraser to accompany him, "Is the meal delicious?"

"It's okay." Le Zhishi looked at him, "I've been waiting for you for 5 minutes, but you didn't go either."

"You've been waiting for me for a long time. I said why it took so long. I forgot." Jiang Yufan rolled up his sleeves, "That idiot Zhang Chen still hates you, saying that you are too embarrassing to come back, he is so angry If I can't catch up with myself, I will vent my anger on others."

Le Zhishi wiped the blackboard vigorously with his arms, and didn't really care about who said what when he was not around, "He just had a mouthful for a day or two. If the person I like fell in love with someone else, I would definitely not be happy either. "The hand holding the eraser suddenly stopped, and Le Zhishi's eyes stayed on the few lines of equations in the corner.

This was the last unfinished task Song Yu assigned him.

"Do you have your phone with you?" He turned his head to look at Jiang Yufan, who was collecting ashes.

"Yes, what's the matter." Jiang Yufan took it out and handed it to him, "You just remembered to take pictures now, it's gone."

Le Zhishi didn't speak, and took a picture of the lines of equations in the lower right corner with his mobile phone.

"Thank you, please send me this."