Li Zheng hurriedly rubbed his face, no longer paid attention to the two, and after writing down the name and test number, he began to review the questions.

At this point, he didn't plan to activate the speed, and based on experience, he didn't need to.

Second, there are many people in the examination room, the invigilation is strict, and the speed of doing questions is too exaggerated and inappropriate.

In short, although the two perverts, one on the left and one on the right, are annoyed to death.

Li Zheng's road to competition can be regarded as the beginning.

At the same time, this is also the first time to fight with Lin Yujing at the top of the Forbidden City.

Although it is not an examination room, Li Zheng can still imagine Lin Yujing's debt and pain.

Just like Ximen blowing snow, all he thinks about day and night is the trick of the Ye City Lord.

Let's get started, the final showdown with all your might.

After emptying the distracting thoughts, Li Zheng first swept a rough circle of rolls.

The difficulty is lower than last year's, but there are very few points to give.

Let everyone work hard, this trend is good.

Pick up the pen and kill!

The first big question, as usual, is to write a reaction formula according to the conditions, four small questions, a total of 8 points.

[1-1: Silicon nitride can be used as a substrate material for LED, which can be prepared by reacting with ammonia gas with SIH4 by plasma method]

Well, that's it, one of the rare scoring questions, just see the silicon nitride directly out of the results, pay a little attention to the positive and negative prices, brainless trim -

3sih4 + 4nh3 == si3n4 + 12h2↑

Next, the three equation questions were also done like water, and the intensity was just enough to warm up.

Li Zheng's mentality gradually stabilized.

This paper is done as an ordinary exam, and there is nothing special.

Haruka thought about scratching his ears and cheeks when he did the competition problem for the first time, and he wanted to laugh himself.

Step by step, to this day, looking back at those once desperate peaks, it is nothing more than that.

The second big question, the structure question, is the same 4 questions, with a total of 8 points.

[2-1:195K, phosphorus trioxide reacts with ozone in dichloromethane to form P4O18, and a schematic diagram of the structure of the P4O18 molecule is drawn.] 】

This question is a bit cumbersome and needs to be analyzed.

Steadily, optimistic about the reaction conditions, step by step analysis of the reaction process, and finally the structural schematic diagram of P4O18 will naturally come out.

First of all, 195k refers to the reaction temperature, which is about -78°C.

From this, it can be seen that the reaction medium is very inert......

According to the structure of P2O3, there are lone pairs of electrons on P, while the resonance structure of O3 is ......

......

The first two questions were done like water.

The last two are rubber organisms, and the test turned out to be biorubber (EPDM) for the World Cup designated ball.

Interesting.

Although he doesn't understand football, Li Zheng understands rubber very well.

In the process of speculating on the structure, only one super-outline point is encountered, but it is easy to make a choice when combined with the "kick-resistant" characteristics of the football.

......

The third question starts with a big question worth 12 points.

The real guy who opened the gap.

This first real guy made Li Zheng feel uncomfortable.

This is a question in honor of the 150th anniversary of Mendeleev's discovery of the periodic table.

It is said that Mendeleev prophesied a variety of elements, including a.

The sulfide of a was treated at 800 °C in nitrogen to produce b.

After that, ammonia gas is injected at a higher temperature, and the red compound C is produced.

How and how...... D and E were produced.

e will generate d when it encounters water...... How can D get B?

Based on this set of conditions, it is speculated what ABCDE is.

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

Doing this kind of problem has a refreshing feeling of solving puzzles.

Long live Mendeleev.

The fourth question, the difficulty of the college entrance examination, is done like water.

The fifth major question, element question, mineral information, isotope dating, is specially stumbling and walking.

......

In fact, when they were doing the questions, the two teachers of the fourth middle school, a man and a woman, were not idle.

On the big weekend, being invigilated was originally a very irritating thing.

But looking at this pile of anxious students, they are a little more comfortable.

And found something fun.

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

"It's very stable, but it's too slow. The female teacher glanced at the short-haired girl on Li Zheng's right, "This is stable, I didn't catch my head from beginning to end, and my expression didn't even change." ”

"It's true that most of the candidates are scratching their heads. The male teacher grabbed the little hair and looked at the area, "If you want to scratch your head, the three people in this row don't seem to have caught it, is it from our school?"

"No, this exam room is not our school. ”

was chatting, they had just praised Li Zheng, who was very steady, suddenly glared and raised his hand with a "whoosh".

The male teacher hurriedly leaned over and asked with concern, "What's the matter, my stomach is uncomfortable?"

Of course, the male teacher's misunderstanding is not his fault, people who are not familiar with Li Zheng usually think of diarrhea when they see him raise his hand.

Li Zheng pointed to the scroll and whispered: "Here, using the lutetium hafnium method to make a dating calculation, the natural isotopes of lutetium are only 175 and 176, but the title says 176 and 177, which leads to the second question cannot be calculated, please ask the teacher to reflect it." ”

The male teacher's eyebrows tightened.

"Classmate...... I'm not a chemistry teacher......."

"In such a big examination room, there should be the Jijing Chemical Society, right?" asked Li Zheng.

"Yes, yes, there is ......" The male teacher looked around, falling into hesitation.

The competition questions are all written by university professors, and mistakes are very rare.

Even if it really goes wrong, there will be more students who will report it.

Could it be that this kid is the fastest one in this exam room?

The male teacher couldn't help but look at Li Zheng again.

This stylish outfit with fluffy hairstyle.

It looks like it's not good at studying.

It is really inappropriate to report it on the basis of his own words.

But you can't judge people by their appearance, what if he is really the most demonic one in the whole examination room?

The male teacher asked, "Classmate, which school are you?"

"Sakura Lake. ”

"Sakurako, isn't it a park?" the male teacher looked confused.

“......”

At this time, the children's teacher also came over: "I know about Sakura Lake Middle School...... Key ...... of districts"

"It has nothing to do with my school. Li Zheng pointed to the scroll and said, "177LU/177HF, this isotope sample is not valid, it should be 176LU/177HF." ”

After the male and female teachers looked at each other, the male teacher stiffened his head and said, "In this way, you do the following questions first, and if there are still people who reflect, we will reflect upwards." ”

"It must be wrong, don't wait. Li Zheng had no choice but to shake his head and aim directly at the sixth question.

The male and female teachers breathed a sigh of relief and walked back to the podium.

"Is there really Sakura Lake Middle School?" the male teacher asked.

"Hmm...... Tell me the truth......" the old woman said softly, "There are basically no ordinary middle schools now, and the worst is the district focus." ”

"On this condition, don't you make trouble if you still come to the competition? The male teacher shook his head and smiled, "Besides, even if the question is really wrong, the students of our school should pick it out first." ”

As he spoke.

Li Zheng raised his hand almost at the same time.

The male and female teachers looked at each other and went over separately.

They reflect the same problems as Li Zheng.

Ask the school again.

Two benevolence attached.

It's a real panic now.

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

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

This dick man.

Faster than me?

It's so ruthless, why is this image?

Next, all three of them skipped the question and continued to immerse themselves in the answers.

Although Li Zheng does the question like water.

But time also flies like water.

Although the exam lasted for 3 hours, as soon as the hour was over, some students began to leave.

It's certainly not the end of the story.

Rather, they gave up.

This is what Sun Leyang called a "competition gambler".

Maybe I didn't prepare it specifically, but I just came to mix it up, and if I could do it, I wouldn't be able to get a prize.

Maybe it's because of lack of preparation, only deliberately aiming at a few limited knowledge points, and once you find out that the paper has been tested for something else, you won't do it at all.

As for those who really give it their all, it is impossible to give up easily.

Crying is also done.

Li Zheng did this for two and a half hours before he breathed a sigh of relief.

The 90-point questions have been done.

A score of 5 is really no idea.

It can also be said that it was pitted by Sun Leyang.

He clearly said that he didn't need to read books such as "Analytical Chemistry" and "Physical Chemistry" in the preliminary round.

But it still seems that some of this content is examined.

Of course, Sun Leyang may be for Li Zheng's good, and he doesn't want him to waste time on the difficult points.

Look at the roll again.

The last 5 points of the empty question are naturally the half of the questions that went wrong.

Li Zheng raised his head and looked at the podium.

I happened to make eye contact with the male teacher.

The male teacher hurriedly walked over and whispered.

"Classmate, the problem has been reflected, but I haven't replied yet. ”

"My feeling is that there shouldn't be a reply......

"Even if the Chemical Society has a decision, there are so many examination rooms across the country, and it is too late to notify them one by one. ”

"If you can do it, if you can't do it, forget it, there is no way to say this. ”

The invigilator sent such an answer, and Li Zheng had no choice but to give up.

People are just ordinary invigilators, and it's good to be able to talk about this.

So, according to his own ideas, Li Zheng changed the title to 176lu and forcibly finished it.

After checking for a while, the bell rang and the roll was retracted.

This roll is a bit annoying.,It's collected with scratch paper and the original volume.,I can't keep a souvenir.。

As the volume was taken away, Li Zheng's decisive battle ended so plainly.

It's probably overprepared, and it's obviously a super big exam, but it's even more fun than usually doing exercises by yourself.

The rest don't think so.

As soon as the exam was announced, there was a wail in the classroom.

"Ahhhh

"What's this...... Didn't you say that this year would be easier than last year?"

"Double Bond Carbon Negative?Carbine?Ah, I'm dead!"

"Hate Mendeleev!"

"What the hell is the fifth question!"

These people looked like people before the exam, and they looked very stable.

Now almost all of them have been destroyed by the exam papers, and they are completely out of shape.

In the midst of this series of painful vents, there are two girls.

I actually cried......

While sobbing, I put away my stationery.

Come to think of it, there is no shortage of people who have been preparing for competitions since junior high school.

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

If you don't say it, you will make a mistake in the college entrance examination, and you will go to college anyway.

The competition failed, and the efforts that have been spent on chemistry for many years have been completely in vain.

It's like the sullen man with glasses on the left said.

Competition, it's really brutal.

Li Zheng looked at the two girls who wiped their tears, and felt a little distressed.

Why, O you?

It's good to have fun, and it's right to learn knowledge.

It is not a goal of independent enrollment, and utilitarian learning.

That's the root of the pain.