Chapter 109

Li Zheng rubbed his face and ignored the two people. After writing his name test number, he began to examine the questions.

At this time he did not intend to enable the speed doubling, so according to experience, he did not need to start.

Second, the examination room people are more complicated, strict supervision, too exaggerated speed of the test is not suitable.

In short, although one left and right two abnormal are very tired to die.

Li Zheng's way of competition is also the beginning.

At the same time, it was the first time to fight against the forbidden mountain.

Although not a test room, Li Zheng can still imagine Lin yuejing and still owe and painful appearance.

Just as Ximen blows snow, all the thoughts of the day and night are the God of Ye City.

Start, and fight with all your strength.

After clearing the thoughts, Li Zheng first roughened up a circle of rolls.

The difficulty is lower than the one last year, but the score is very few.

Let's work hard. This trend is good.

Pick up the pen, kill!

The first one, as an example, is to write the reaction formula according to the conditions, four small questions, with a total of 8 points.

[1-1: silicon nitride can be used as the matrix material of LED, which can be prepared by plasma reaction of SiH4 with ammonia gas]

well, in this case, one of the rare sub issues is given. It is OK to see the direct result of silicon nitride. Pay attention to the positive and negative prices, and no brain balance --

3sih4 + 4nh3==si3n4 + 12h2 ↑ ↑ ＜ br >

next, three equation questions will be done as water By the way, this intensity is just enough to warm up.

Li Zheng's mentality has also gradually stabilized.

This paper, when the general examination is done, nothing special.

He wanted to laugh at the way he scratched his face when he first did the contest.

Step by step, to this day, looking back at those once despairing peaks, but also.

The second major question, structure question, the same 4 small questions, total 8 points.

[2-1:195k, phosphorus trioxychloride reacts with ozone to generate p4o18, and the structure of p4o18 is shown. 】This problem is a little bit of trouble, so it needs to be analyzed.

The structure of p4o18 is naturally shown by analyzing the reaction process step by step.

First, 195k is the reaction temperature, which is about -78 ℃.

According to this, the reaction medium is very inert

According to the structure of P2O3, there are solitary pair electrons on P, and the resonance structure of O3 is

……

The first two questions are done again like water.

The second two are rubber organisms, which are the EPDM designated by the world cup.

It's interesting.

Although he doesn't know football, Li Zheng knows rubber very well.

In the process of guessing structure, only one superpoint is encountered, but it is easy to make a choice if it combines the characteristics of football "kicking resistance".

……

The third big question begins, is the big question which is worth 12 points.

The real guy who opened the gap.

This first real guy, let Li zhengshuang not light.

This is a question commemorating the 150th anniversary of mendelev's table of the discovered elements.

It's about mendelev's prediction of a variety of elements, including a.

B was produced by the treatment of sulfide a at 800 ℃ in nitrogen.

After heating up, ammonia is injected, and red compound C is produced.

How about C D and E are produced.

E. when water encounters, D will be generated How d gets B.

Based on these conditions, we can infer what ABCDE is.

This is Li Zheng's favorite inference problem, which not only tests chemical accumulation in all aspects, but also full of logical charm.

Doing this kind of problem has a sense of puzzle solving.

Long live mendelev.

The fourth major question, the difficulty of college entrance examination, is like water to do the past.

The fifth major problem, element problem, mineral information, isotopic dating, is a special problem.

……

In fact, when they were doing the problem, one man, one woman and two four middle school teachers were not idle.

On the weekend, it was a very irritating thing to be collected to supervise the examination.

But looking at the piles of students, they were a little more comfortable.

And found something fun.

"The third in the fourth row, I think it's OK." The male teacher whispered.

"It's stable, but it's too slow." The female teacher glanced at the short haired girl on the right side of Lizheng. "This is stable. She never catches her head from the beginning to the end, and her expression does not change."

"Indeed, most candidates are catching their heads." The male teacher grabbed the hair that he didn't catch much, and looked at the area. "To say to grab the head, this line of three people seems to have not been caught, is it our school?""No, this examination room is not in our school."

As they were chatting, Li Zheng, who had just praised him, suddenly stared and raised his hand.

The male teacher rushed to the past, concerned and asked: "how, stomach discomfort?"

Male teacher's misunderstanding, of course, is not his fault. People who are not familiar with Li Zheng usually associate diarrhea when they see him raise his hand.

Li Zheng pointed to the surface of the scroll and whispered: "here, we use lutetium and hafnium method to calculate the age. There are only 175 and 176 natural isotopes of lutetium, but the title says 176 and 177, which makes the second question unable to be calculated. Please reflect it to the teacher."

The male teacher's eyebrows were tight.

"Classmate I don't teach chemistry either... "

"Such a large examination room, there should be Jijing chemical society?" Li Zheng asked.

"Yes, yes..." The male teacher looked around and hesitated.

The competition questions are all written by university professors. Mistakes are rare.

Even if there is a mistake, there will be more students to reflect.

Is this guy the fastest one in the exam room?

The male teacher could not help but look at Li Zheng again.

This fashionable dress up, fluffy hair.

It seems that learning is not good.

It's not proper to report the case on the basis of his one-sided statement.

But we can't judge people by their appearance. What if he is really the most evil one 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 was confused.

“……”

The children's teacher also came together: "Yinghu middle school, I know Key points of the district... "

"It has nothing to do with my school." Li Zheng pointed to the paper and said, "177Lu 177hf, this isotope sample is not tenable, it should be 176Lu 177hf."

After the male and female teachers looked at each other, the male teacher said bravely: "in this way, you can do the following questions first. If there is any reflection, we will reflect upward."

"It must be wrong. Don't wait." Li Zheng had to shake his head and aim at the sixth question directly.

The male and female teachers were relieved and went back to the platform.

"Is there really Yinghu middle school?" Asked the male teacher.

"Well To tell you the truth... " The old woman whispered, "now there is no ordinary middle school, the worst is the key area."

"On this condition, it's not troubling to come to the competition." The male teacher shook his head and said with a smile, "besides, even if the problem is really wrong, the students in our school should pick it out first."

I'm talking.

Li Zheng raised his hands almost at the same time.

The male and female teachers looked at each other for a moment.

They reflect the same problems as Li Zheng.

Ask the school again.

Two benevolent great Fu.

This is really flustered.

The female teacher stayed, and the male teacher rushed out to find someone.

After reflecting the problem, the man and woman glanced at Li Zheng almost at the same time.

This loser.

Even faster than me?

Clearly so cruel, how this image?

Next, they all skip the question and continue to immerse themselves in the answer.

Although Li Zheng does the title like water.

But time passes like water.

Although the examination time has three hours, but just one hour, began to leave students.

This is definitely not done.

It's about giving up.

This is what sun LeYang described as "the gambler of competition".

Maybe I didn't prepare for it. I just came here to fool around. I'll do it later. Maybe I can get a prize.

Perhaps it is the lack of preparation, only deliberately aimed at a few limited knowledge points, once found that the test paper test other, will not do.

As for the people who really try their best, they can't give up easily.

I'll finish crying.

Li Zheng did this for two and a half hours before he was relieved.

All the 90 points have been done.

Five is really no idea.

It can also be said that it was sunleyang pit.

He clearly said that he didn't need to read analytical chemistry and physical chemistry in the preliminary contest.

But it seems that there are still some tests in this area.

Of course, sun LeYang may be for Li Zhenghao, and does not want him to waste time on difficult points.

Look at the roll.

The last five points of the empty question, of course, is the wrong half of the problem.

Li Zheng raised his head and looked at the platform.

I just had a look at the male teacher.

The male teacher came in a hurry and whispered.

"Classmate, the problem has been reflected and has not answered.""My feeling is, there should be no reply..."

"Even if there is a decision in the chemistry society, but there are so many examination centers in the country, it is too late to inform them one by one."

"If you can do it, if you can't, you can't do it. There's probably no saying about it."

Invigilator teacher sent such an answer, Li Zheng also had to give up.

People are just ordinary invigilator teachers, can say this is also good.

Therefore, Li Zheng changed the title to 176Lu according to his own ideas and forced to finish it.

Check for a little while. The bell rings and rolls up.

This paper is a little annoying. It was collected together with the draft paper and the original volume. I don't want to leave a memorial.

As the papers were taken away, Li Zheng's decisive battle ended so blandly.

It's about over preparation. It's a super exam, but it's more fun than doing exercises by yourself.

The rest of us don't think so.

As soon as the end of the exam was announced, there was a howl in the classroom.

"Ah, ah, ah!"

"What is this Isn't it that this year will be easier than last year? "

"Double bond carbon negative? Cabbeen? Ah, I am dead

"Hate Mendeleev!"

"What the hell is the fifth problem?"

These people obviously before the exam are still human like, looks very stable appearance.

Now almost all of them have been destroyed by the examination papers and have completely lost their manners.

In this series of painful vent, there are two girls.

I cried

While sobbing, while packing stationery.

I think so. There are many people who have been preparing for the competition since junior high school.

For them, the pressure of this matter is no less than that of the college entrance examination.

If I have to say that, I have made mistakes in the college entrance examination, and at least some of them have gone to college.

After many years of hard work in chemistry, the competition failed.

Like the sultry glasses man on the left said.

Competition, it's really cruel.

Looking at the two girls, Li Zheng felt sad.

You, why should it be so hard.

Just have fun and learn knowledge.

It is not to hold the goal of independent enrollment, utilitarian learning.

That's the source of the pain.

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