Chapter 5 Physical Education Classes

In the first few days of school, time passed very quickly. Because the class meetings are basically held and textbooks are distributed, there are few classes that teach knowledge, and the content of the class meeting is mainly to assign class cadres.

I don't participate in the class cadres, I don't pay attention to too many things, but I mostly read books and study on my own, and some knowledge has been learned during the holidays, so I take it as a review. And the time of class, I can understand the content of the lecture, my mother found me some textbooks during the summer vacation, basically the same as the school sent out.

Mom said that the vacation time must be no less than 1 hour of study every day, and the school time is also the time that must study, and you must keep studying for more than 5 hours. As long as you don't know the knowledge, you can take out your mobile phone WeChat and ask your mother, my mother is a jack of all trades, and she can basically help me and Xiaoyan solve the problems of learning. Later, I learned that my mother joined a lot of high school knowledge exchange groups, where there were many teachers, and even many learning questions could be found from there. It's just that at this point in time, I don't know.

According to the agreement between me and my mother, as long as my academic performance does not lag behind, I can make my own decisions about my learning style, even if I don't listen to class or skip class, as long as it is not too excessive, my mother will not object.

I finished studying the learning content I arranged according to the plan, and I saw that the teacher of the physics class was lecturing on the podium at the moment, and the teacher was talking about energy knowledge, mainly explaining the experiments of the law of conservation of energy done by several physicists. The explanation in the book is very detailed, but after the teacher's lecture, it seems that many people have not opened the book. I remember that the first time I read the book, there were some places that I didn't have a deep understanding of, but after reading it for the second time, I basically understood this knowledge point. However, in order to keep up with the speed of the teacher's lecture, he ignores some simple points that need to be paid attention to. I didn't care, according to the lectures in high school, the important ones are basically talked about first, and if there are not so important knowledge points in the exam, the teacher will add them later, so that the way of teaching can also keep up with the speed, and the coverage of knowledge points is also large enough.

It was almost time, and the teacher left the classroom after assigning the homework. I used the 10 minutes between classes to finish my homework and then take a quiet break. I went to chemistry class again, and there was no homework in chemistry class, but I just wrote a question on the podium and asked us to write the equation for the chemical reaction. It is the combustion reaction of carbon in the air, which is basically understood by people in the second year of high school, and this is the simplest chemical reaction equation.

"Yu Wenbo, you come up and write. What is the equation of the chemical reaction of carbon combustion?" Teacher Gu Daojin on the podium raised his eyes and asked my tablemate, because Yu Wenbo was sleeping on the table in class just now.

Teacher Gu Daojin is the homeroom teacher of our class, and Yu Wenbo is a classmate I only met in the second year of high school. However, the question was relatively simple, and I ignored him.

"Teacher, I won't!" Yu Wenbo stood up and said to the teacher.

Teacher Gu Daojin cupped his eyes and looked away and said, "No, you just stand first, and the spirit is too empty in class." Is your Yuanying cultivation full? Li Zengyue, please write about it. ”

Damn, it's not going to happen? What's going on?

I was Yu Wenbo's tablemate, I touched his hand and whispered, "What's the matter? Isn't this a junior high school knowledge point? Why don't you know it?" Did you come in by connection?"

"I'm a sports student!" Yu Wenbo also whispered to me.

Well, I actually forgot, I happened to be assigned to the PE class in my sophomore year of high school. Although I am not a physical education student, I happen to be in a physical education class.

The teacher asked Li Zengyue to answer the question instead, Li Zengyue was my classmate in the first year of high school, and his science grades were always a little worse than mine. But he is also the deputy squad leader. In this class, he is also the deputy class leader. I remember that when he was a freshman in high school, he seemed to like a female classmate, and every time he found that the female classmate was facing a problem, he would take the initiative to teach that female classmate. But the female classmate didn't like to deal with him, and often said: I want to wait for Zhou Yu to help me answer this question, don't talk, I can't ask Zhou Yu questions after you say it, I have bought all the snacks.

As a matter of fact, Li Zengyue's grades in liberal arts are better than mine, but girls usually ask boys questions in science! Who has ever seen a girl ask a male classmate to ask for English and Chinese homework? I remember that in the forum incident two days earlier, Li Zengyue also helped others to flesh out my name, which was also caused by my old grudge with him.

Li Zengyue's science academic performance is still okay, and such a question is not difficult for him, so as soon as the teacher asks him, he goes up to the podium to show himself.

In high school life, answering the teacher's questions and answers is a good way to show that you are studying well, and we don't have much fun in high school. Only when you are doing homework, doing test papers, or doing difficult problems, the first person to make a difficult problem first, and then a bunch of people in the class come to ask you for the answer, it is a very happy feeling. And people who can show themselves with good grades and study well in ordinary times are often more likely to be respected and favored in the class. And our class is a physical education class, and it is also a science class, and there are only 8 girls in a class of 50 people. So, if you can show that you have good grades, but there are many benefits, as for what are the benefits? It's class time, and Yu Wenbo is still trapped by the teacher, if I don't save him, he will be a game voer. I'm not the kind of person who ignores my teammates, so Yu Wenbo I have to save it!

I quickly took out a notebook, wrote out two reaction equations on paper, and then tore off a piece of paper and handed it to Yu Wenbo. Why are there two equations? Because there are two ways to burn carbon, one is to burn enough to become carbon dioxide, and the other is to burn carbon monoxide inadequately. I handed the note to Yu Wenbo and nodded to him.

"Slow, teacher, I will!" Yu Wenbo took my note, and then flew to the podium in two strides, Yu Wenbo is 1.8 meters tall, and the physical education student is a cow! I am 1.75 meters tall, and I sit in the penultimate row of the classroom with Yu Wenbo.

As soon as Yu Wenbo stepped onto the podium, Li Zengyue had already written the chemical reaction equation for the answer, but he only wrote a chemical reaction equation in which carbon was fully burned to become carbon dioxide.

The teacher looked at Li Zengyue's answer, nodded with satisfaction, and then began to explain regardless of Yu Wenbo writing the answer on the other side: "Students, you see, the chemical equation of carbon combustion is like this. Carbon burns in the air and reacts with oxygen. After the reaction of carbon C with oxygen O2, the two oxygen atoms of oxygen O2 are split, and the outermost 6 electrons, each of the two atoms needs two electrons to reach the 8 stable electrons of the second layer of electrons. Supplementation becomes a stable chemical. The outermost 4 electrons of carbon can be supplemented with two electrons to an oxygen atom at one side, until the third layer of electrons is added to the stable structure of 8 electrons, forming the stable structure of OCO, but we need to write CO2 for the writing of chemicals. In this knowledge point, we can understand the process formation of chemical reactions, as well as the complementary combination of ions.

”

At this time, Li Zengyue went down to the podium after the teacher's explanation. The teacher watched Yu Wenbo walk up to the podium later, so he said, "Yu Wenbo, you don't want to plagiarize Li Zengyue's answers, do you?

Halfway through the teacher's words, he found that Yu Wenbo took out chalk and wrote two equations on the blackboard, and also marked the situation of adequate response and insufficient response.

Originally, the teacher was halfway through his words, but he saw Li Zengyue return to his seat, and the answer left on the blackboard was only a chemical equation, but Yu Wenbo wrote two chemical equations. From the perspective of the knowledge points of the teacher's lecture, in fact, writing the answer of Li Zengyue is already a good answer. Because this lesson is about chemical reactions, but sometimes the problem is not as simple as it seems.

The question asked by the teacher was only a chemical equation for the combustion of carbon in the air, and he did not say whether it was one equation or two equations. It is also not stated whether the combustion of carbon is an adequate or inadequate reaction.

In junior high school and the first year of high school, many chemistry classes basically mentioned the point of full reaction in the carbon combustion reaction, and the teacher's explanation of the knowledge points was originally just to talk about an equation of full reaction. However, the teacher also neglected that when asking a question, it is necessary to explain the possible situation clearly, and once the situation is not clear enough. Then the answer is quite different. In the content of the teacher's lecture, the knowledge points obviously only want people to learn a stable compound that fully reacts to carbon dioxide, so that he can explain the knowledge points of the formation of stable compounds, but if it is used as the answer to the test paper, it is obvious that two equations need to be written, otherwise points will be deducted.

"Ahem... Ahem... Well, Yu Wenbo's answer is very correct, and Yu Wenbo's consideration is also very comprehensive, carbon in the combustion of air, there are indeed two reactions. Because the oxygen in the air is not very sufficient, if the adequate reaction is not accurately stated. That does have two reactions. Li Zengyue, the next time you encounter this problem, you must think about it comprehensively, you know?"