Chapter 12 The second model is coming

This is a study on the molecular structure of organic matter...

Its main test point is the proficiency in the molecular structure of stupid rings...

The benzene ring is the structure of the benzene molecule. It is a planar regular hexagon, each vertex is a carbon atom, and each carbon atom is combined with a hydrogen atom. The carbon -carbon bond in the benzene ring is a unique bond between a single bond and a double bond. The bond angles are both 120° and the bond length is 1.40Å...

Stupid ring structures include Kekulé type, Pauling type, etc...

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9 , Senior Grade 3 .

Chen Yu buried his head in looking at a chemistry test paper on the table. While quickly reading and solving the questions, he quickly analyzed the purpose of the question, the knowledge points examined, and recalled the relevant knowledge points in his mind.

In the past few days, Chen Yu has been frantically conquering chemistry.

However, because of the additional task of one English word, Chen Yu re-planned his time and no longer devoted all his time to chemistry as before .

He would take the morning reading class in the morning and half an hour before going to bed at night to memorize words, and spend the rest of the time studying chemistry crazily.

　

While Chen Yu was studying chemistry crazily, the time for the second mock exam in Jiazhou City was finally determined.

The second mock exam will be held in two weeks!

　　As soon as the time for the second model was announced, all the senior high school students in Xingdong County No. 1 Middle School began to get nervous, especially those students who had relatively good academic performance and had a high hope of being admitted to college. Tightened up.

Although many teachers say that the first model has the highest value and the second and third models are not as valuable as the first model, no student dares to ignore the second and third models.

For students who are interested in taking the college entrance examination and want to do well in college, every exam is an extremely important training opportunity, and the second model and the third model are unified across the city, and the specifications, time and other details are completely equivalent to the college entrance examination. , is the best opportunity to train troops!

Time flies so fast! The second model will be available soon !

When Chen Yu heard the head teacher Wang Dezhong announce the time for the second model , he looked a little dazed in his eyes.

From the time he obtained the system to now, it feels like only a blink of an eye, but more than half a month has passed.

Judging from the current progress, there should still be a good chance of getting 100,000 points. Now I have obtained more than 20,000 points, and the task of 20,000 points is steadily progressing!

Chen Yu silently reviewed the gains of the past half month or so, and was quite satisfied with the progress.

You still have to keep working hard. The previous series of tasks are relatively simple and easy, but the subsequent tasks may not be so easy to complete! If this series of tasks in the system are arranged according to the subjects of the college entrance examination, then this series of tasks will probably end soon. Based on six subjects, it will only be 60,000 points by the end, plus English vocabulary This mission only has 70,000 points, and there are still 30,000 points left!

Therefore, you still can’t be careless!

　　If you fail to complete the task of 100,000 points in one day , you must not be careless!

And even if you complete the task of 100,000 points, it is just the first step in a long journey of thousands of miles. To truly cure the disease, you need 5 million points! There is still a long road ahead!

In just a moment, Chen Yu dispelled the sense of pride and satisfaction in his heart and rekindled his high fighting spirit.

Lowering his head, Chen Yu continued to study chemistry papers.

………………

what happened?

Why can't I always get full marks?

Obviously I feel that I have completely mastered high school chemistry knowledge?

What's wrong with me now?

Nine p.m.

where evening self-study was going on , Chen Yu frowned as he looked at another chemistry test paper he had just completed, with a look of doubt and contemplation in his eyes.

Compared to physics, Chen Yu is relatively new to chemistry. After all, he has almost no previous foundation.

But Chen Yu was very confident in his learning ability. After receiving the task, he used his old methods to conquer chemistry.

First, read the textbooks to master the most basic concepts and laws, then find ways to learn and integrate various knowledge points, and finally deepen and comprehend the knowledge by answering questions .

Facts have proved that his old method is indeed very effective when used in the subject of chemistry.

After he read the textbook and found the key point of learning chemistry-the classification method, he quickly mastered all the basic knowledge of high school chemistry and quickly integrated them .

Immediately afterwards, Chen Yu used the method of frantically answering questions to consolidate and integrate the knowledge of chemistry.

Everything in front of him was completely correct. Chen Yu could feel his progress, and his accuracy in answering questions also proved his progress.

But since yesterday, Chen Yu felt that he had fallen into a bottleneck and could never break through.

When I write the chemistry test paper, the score is always around 145. There is no way to get a perfect score. Occasionally, a paper gets a perfect score, which also involves some luck. There is always a problem that is not certain.

Originally, Chen Yu thought that he might not have studied the papers enough, so he spent another day studying the papers. But after finishing the papers today, he found that his feelings were no different from yesterday, which made him feel that something was wrong. .

Is the method wrong?

It doesn't make sense.

There is no problem with the classification method.

The chemistry knowledge in high school may seem complicated, but in fact the core is really classification!

Substances are classified into mixtures and pure substances, followed by mixtures and pure substances respectively.

Each type of substance is further subdivided according to different characteristics. The focus is on pure substances. For example, pure substances can be divided into compounds and elements. Compounds can be divided into organic compounds and inorganic compounds. At the same time, compounds can also be divided into multiple substances. Compounds and binary compounds can also be divided into oxides and non-oxides.

Through these classifications, various classified substances are summarized and the characteristics and laws that run through some different substances are found, as well as the laws of some chemical reactions, that is, the laws of material change.

enough questions ?

It doesn't make sense. There are at least a dozen papers that have been written down in the past few days. The amount of papers is not too much, but it is not too small to say that it is small.

Logically speaking, it is enough for him to fully master a subject.

When he was studying physics, he never had to answer so many questions!

There must be some problem!

When I return to the rental house tonight, I will use a focus card to see if I can complete the chemistry task tonight!

Chen Yu made a decision.

When he was a freshman in high school, he had to study for a math competition. In order not to disturb his classmates in the same dormitory and to make it easier for him to study, Chen Yu rented a room in front of the school and moved out of the school dormitory. Later, the competition ended. After that, Chen Yu knew that he was far behind his classmates in some homework and could not review at the pace of most classmates. In order to review better at his own pace, he did not move back to the dormitory. .

Because of his headaches before, the rental house did not play its due role. It only helped Chen Yu hide his physical condition. However, after obtaining the Xueba System, this rental house played an extremely huge role.

If you live in a school dormitory, you have to turn off the lights and go to bed at 11pm every day. The teachers in No. 1 Middle School forcefully control the students' work and rest, and for Chen Yu, 11pm can be said to be the right time. Prime time for learning!

Everyone's work and rest routine is different, and everyone needs different sleep time. For Chen Yu, going to bed at 1 o'clock every night and getting up at 5:30 in the morning, four and a half hours of sleep is completely enough. , this is not the way he worked and rested after he obtained the system. He had always worked and rested like this before his headache occurred, and there was no lack of energy the next day at all.

It is precisely because he only sleeps less than five hours a day that he can complete the task of studying mathematics and physics in such a short time, and now he is about to complete the task of studying chemistry.