Chapter 108: Do the past like water

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Li Zheng rubbed his face busy, no longer ignored the two, after writing the name test number, began to examine the question.
At this time, he did not intend to enable double speed, and according to experience, he did not need to enable it.
Secondly, there are many people in the examination room, strict supervision, and the speed of the question is too exaggerated and inappropriate.
In short, although one left and one right two perverts are so annoying.
Li Zheng's road to chemical competition is also beginning.
At the same time, this is also the first time that he has battled Lin Yuejing against the top of the Forbidden City.
Although not an examination room, Li Zheng can still imagine Lin Yuejing owing and suffering.
Just like Ximen blowing snow, day and night thought of Ye Chengzhu's trick.
Let's get started, the final showdown with all our strength.
After clearing his miscellaneous thoughts, Li Zheng first swept the surface.
The difficulty is lower than last year's one, but there are very few points.
Let everyone work hard, this trend is good.
Raise the pen and kill!
The first big question, as usual, is to write the reaction formula according to the conditions, four small questions, a total of 8 points.
[1-1: Silicon nitride can be used as the matrix material of LED, it can be prepared by plasma method using SiH4 and ammonia gas reaction]
Well, on this one, one of the rare submission points, it is enough to see the result of silicon nitride directly. Pay attention to the positive and negative prices a little, without brain balance-
3SiH4+4NH3Si3N4+12H2↑
Next, the three equation questions are also done like water, which is just enough to warm up.
Li Zheng's mentality also gradually stabilized.
This paper is done as a general exam, nothing special.
He wanted to laugh when he thought about how he scratched his head when doing the competition for the first time.
Step by step, to this day, looking back at the peaks that were once desperate, it is no more than that.
The second big question, the structure question, also has 4 small questions, a total of 8 points.
[2-1: 195K, phosphorus trioxide reacts with ozone in methylene chloride to generate P4O18, and draws a schematic diagram of the structure of the P4O18 molecule. 】
This question is a little troublesome and needs to be analyzed.
Steady and steady, optimistic about the reaction conditions, step by step analysis of the reaction process, the final schematic diagram of P4O18 naturally came out.
First, 195K refers to the reaction temperature, which is about -78°C.
According to this, the reaction medium is very inert...
According to the structure of P2O3, there are lone pairs of electrons on P, and the resonance structural formula of O3 is...
...
The first two sub-questions are done like water again.
The last two are rubber organisms, and the test actually turned out to be the EPDM of the World Cup designated ball.
interesting.
Although he doesn't understand football, Li Zheng knows rubber very well.
In the process of speculating the structure, the only thing that hits a super-level point, but as long as it combines the "kick-resistant" characteristics of football, it is easy to make a choice.
...
The third big question starts with a big question worth 12 points.
The real guy who opened the gap.
This first real guy made Li Zhengshuang not light.
This is a question commemorating the 150th anniversary of Mendeleev's discovery of the periodic table.
It is about Mendeleev's prediction of various elements, including A.
The sulfide of A was treated at 800°C in nitrogen to produce B.
After heating up and injecting ammonia gas, red compound C was produced again.
How about C... D and E were produced.
When E meets water, it will generate D...how can D get B.
Based on this series of conditions, it is inferred what ABCDE is.
This is Li Zheng's favorite inference question, which not only tests the accumulation of chemistry in all aspects, but also is full of logical charm.
Do this kind of problem, there is a cool sense of puzzle.
Long live Mendeleev.
The fourth major question, the difficulty of college entrance examination, is done like water.
The fifth major question, the element question, mineral information, isotope dating, specifically passed and walked.
...
In fact, when they were doing the questions, the teachers of one man, one woman and two No. 4 middle schools were not idle.
On weekends, being scolded for proctoring was originally annoying.
But looking at the pile of burnt students, they were more comfortable anyway.
And found interesting things.
"The third in the fourth row, I think it works." The male teacher whispered.
"It's very stable, but the progress is too slow." The female teacher glanced at the short-haired the right side of Li Zheng. "This is stable, and I didn't catch it from beginning to end. Even my expression didn't change."
"Indeed, most of the candidates are scratching their heads." The male teacher scratched his hair and looked towards the area. "To say scratching the head, the three people in this row didn't seem to have scratched. It was from our school. What?"
"No, there is no school in our examination room."
They were chatting. They just praised Li Zheng, who was very stable. He suddenly glared and raised his hand.
The male teacher hurriedly walked in the past and asked with concern: "Why, your stomach is uncomfortable?"
The misunderstanding of the male teacher is certainly not his fault. People who are not familiar with Li Zheng usually think of diarrhea when they see him raising their hands.
Li Zheng pointed to the scroll face and said in a small voice: "Here, the lutetium-hafnium method is used for dating. The natural isotopes of lutetium are only 175 and 176, but the title says 176 and 177, which leads to the second question. Teacher, please tell me."
The male teacher frowned.
"Classmates...I don't teach chemistry either..."
"Should such a large examination room have the Jijing Chemical Society?" Li Zheng asked.
"Yes, yes..." The male teacher looked around and hesitated.
Contest questions are all written by university professors, and mistakes are very rare.
Even if it is really wrong, more students will reflect.
Is it possible that this kid is the fastest one in this exam room?
The male teacher couldn't help looking at Li Zheng again.
This stylish dress, fluffy hairstyle.
It seems that learning is very bad.
It was really wrong to report on his own side.
But you can't judge people by their appearance. What if he is really the most demon in the examination room?
The male teacher asked: "Classmate, which school are you from?"
"Sakura Lake."
"Sakura Lake? Isn't it a park?" The male teacher's face was dumbfounded.
"..."
At this time, the female teacher also came together: "I know the Yinghu Middle School... the focal point..."
"It has nothing to do with my school." Li Zheng pointed to the paper, "177Lu/177Hf, this isotope sample is not established, it should be 176Lu/177Hf."
After the male and female teachers looked at each other, the male teacher said daringly: "In this way, you do the following questions first, and if there are people who reflect, we will reflect upwards."
"It must be wrong, don't wait." Li Zheng also shook his head and aimed directly at the sixth question.
The male and female teachers were relieved and walked back to the podium.
"Really there is Yinghu Middle School?" the male teacher asked.
"Um... to be honest..." the old woman said softly. "There is basically no middle school now, the worst is the district focus."
"On this condition, come to the competition, isn't it trouble?" The male teacher shook his head and smiled. "Besides, even if the question is really wrong, it should be picked by our school students first."
Talking.
Li Zheng and the two of them raised their hands almost simultaneously.
The male and female teachers stared at each other for a moment, and passed.
They reflected the same problem as Li Zheng.
Ask the school again.
Two Renda attached.
This is really a panic.
The female teacher stayed, and the male teacher hurried out to find someone.
After reflecting the problem, the man and woman glanced at Li Zheng almost simultaneously.
This cock.
Did you do it faster than me?
Obviously so cruel, why is this image?
Next, all three skipped this question and continued to immerse in the answer.
Although Li Zheng does the title like water.
But time also passed like water.
Although the exam time is 3 hours, just one hour later, some classmates leave.
This is certainly not done.
But gave up.
This is the "race gambler" described by Sun Leyang.
Maybe I didn't prepare it specifically, but just came here to do it. In case I would do it, I might get an award.
Perhaps it was insufficient preparation, and only a few limited knowledge points were deliberately targeted. Once it was found that the paper had taken other tests, it would never be done.
As for those who really go all out, it is impossible to give up easily.
I’m going to finish crying.
Li Zheng did this for a full two and a half hours before he was relieved.
The 90-point questions are all done.
5 points is really no idea.
It can also be said that Sun Leyangkeng.
He clearly stated that he did not need to read the books "Analytical Chemistry" and "Physical Chemistry" in the preliminary round.
But it still seems to have tested some of this content.
Of course, Sun Leyang may be for Li Zheng's sake, and he doesn't want to let him spend time on the problem.
Look at the roll noodles again.
The empty question of the last 5 points is naturally the half of the question.
Li Zheng raised his head and looked at the podium.
Just came across with the male teacher.
The male teacher came in a hurry and whispered.
"Student, the problem is reflected, and there is no reply yet."
"My feeling is that there should be no more..."
"Even if there is a decision made by the Chemistry Society, there are so many examination rooms in the country, and it is too late to notify them one by one."
"You can do it if you can, if you can't do it, there's nothing to say about it."
The invigilator gave such an answer, and Li Zheng had no choice but to give up.
People are just ordinary proctors, and it's not bad to say this.
Therefore, Li Zheng changed the title to 176Lu according to his own ideas, and forcibly finished it.
Check again for a little while, the bell rings and rolls up.
This reel is a bit annoying. It was collected with the original paper together with the draft paper.
With the paper taken away, Li Zheng's decisive battle ended so plainly.
It's probably over-prepared. It's obviously a super exam, but it's more fun than usual doing exercises.
The rest do not think so.
Just after the test was announced, there was a wailing in the classroom.
"Ahhhhhh!"
"What's this... isn't it easier this year than last year?"
"Double bond carbon negative? Carbin? Ah I'm dead!"
"Hate Mendeleev!"
"What the is the fifth question!"
These people were all very humanoid before the exam, and they looked very stable.
But now almost all the staff were destroyed by the examination papers and completely lost their gait.
In this series of painful vents, there are two girls.
I even cried...
Weeping while packing up the stationery.
If you want to come, there are many people who have been preparing for the competition since junior high school.
For them, the pressure on this matter is no less than the college entrance examination.
If you don't say that, the college entrance examination mistakes, somehow in college.
The competition test was smashed, and these years of hard work on chemistry were completely lost.
Just like the sullen glasses man on the left said.
The competition is really cruel.
Li Zheng looked at the two tearful girls and felt a little distressed.
You, why is this so painful?
Is it good to have fun, right to learn knowledge?
Instead of holding the goal of independent enrollment, utilitarian learning.
This is the source of pain.