Chapter 109 (1/2)
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.
“……”