High school chemistry is a very neutral subject, because among the three brothers, physics is the most scientific subject, biology is the most liberal arts, and chemistry is sandwiched in the middle, half liberal arts and half science.

In detail, chemistry is much smaller than biology in terms of the richness and fragmentation of knowledge content, and chemistry is lower than physics in terms of the amount of calculation and analysis difficulty.

It is the most balanced of the three brothers.

What does balance represent, that is, you can't have shortcomings, you have to be able to count and memorize, otherwise you won't be able to learn any of the missing aspects.

In addition, the chemistry exam paper is probably the most polarized Wu Bin has ever seen, and it is so simple that he can do it right without using his brain, such as the first question on a chemistry paper he drew casually in the morning.

On February 29, 2012, PM2.5 detection indicators were added to the newly released "Ambient Air Quality Standards". One of the main sources of PM2.5 μm particulate matter is the combustion of fossil fuels, and the following measures can reduce PM2.5 pollution ()

A. Encourage the use of liquefied petroleum gas as fuel

B. Encourage the use of solar, wind and other energy sources

C. Encourage coal-fired power generation and reduce the use of hydroelectric power generation

D. Encourage the use of private cars and avoid taking buses.

Isn't it so simple that option B is shining over there?

Because the other three answers seem to be wise, you know that they can't be them with common sense, so it can be said that if you choose this question incorrectly, then your teacher will probably discount your legs.

Therefore, this kind of question has always been called the college entrance examination welfare question (chemistry limited version) by students

In Wu Bin's view, the biggest significance of this kind of question is probably to tell your students that chemistry is actually closely related to your life, and you may be able to save nature if you learn it well.

However, once it comes to the big question, the painting style of chemistry becomes the most intense, for example, the last big question that Wu Bin now sees in a legend-level difficulty middle school, it is so difficult that when he reads the question himself, the whole person's painting style also changes drastically (refer to Edvard Munch's "The Scream")

The main component of a mica schist is KMgFeSiO(OH), which contains a small amount of Cr and Mn impurities. Please answer the following questions:

(1) There are _____ unpaired electrons in the ground state Cr atom, and the shape of the electron cloud of the energy level occupied by the outermost electron is _____.

(2) Whether the complexes formed by transition metal ions and water molecules have color is related to the electronic configuration of their d orbitals. In general, there is no color when it is d or d1, and there is color when it is d1d. Then: _____ [Mn(HO)]2+ (fill in "none" or "have") color.

(3) KMgFeSi4O(OH) can be expressed as _____ in the form of oxide.

(4) The flame color reaction of K element is _____ color, and the microscopic reason for the flame color reaction of many metal elements is _____.

(5) The structure of the compound formed by Mg2+ and phenylalanine radical ion (molecular formula) is simply (molecular formula)

In this compound, the types of chemical bonds are _____ (fill in "metallic bonds", "σ bonds", "π bonds" or "coordination bonds"), and the hybrid orbital type of C atom is _____.

(6) At different temperatures, the two stacking methods of iron elemental unit cells are shown in the figure:

(1) The coordination numbers of Fe atoms in Figure 1 and Figure 2 are _____ and _____, respectively.

(2) If the crystal density in Figure 2 is pg·cm3 and the value of Avogadro's constant is NA, the distance between the two nearest Fe atoms in the unit cell is _____pm

Wu Bin was stunned after reading this question.

I thought he had seen chemistry in his sophomore year, and he had the strength to fight even if it was some big questions, but now, there's a fart!

So Wu Bin immediately took the roll to the office to find Yu Xuguang.

Yu Xuguang almost dropped the cup when he saw Wu Bin bringing it, and looked at Wu Bin with a shocked look.

"You...... Have you learned this to the extent of yourself? ”

"No, I just want to ask the teacher what it wants to test me on this question."

"I'm ......"

In the end, Yu Xuguang still swallowed back the two words that insulted the teacher's morality, and instead stood up and kicked several times in the direction of Wu Bin's kick, and the posture was so eager to kick Wu Bin out of the office.

And kicked and shouted: "Do you study like this!?" The question asks you that you don't know anything, what else do you do! ”

"Look down on chemistry, don't you!?"

"Look down on chemistry, don't you?"

Wu Bin had no choice but to hide and explain: "No, teacher, I'm curious about how difficult chemistry can be." ”

"I don't look down on chemistry."

"I really don't look down on it!"

In the end, Yu Xuguang finally stopped when he was tired of kicking, walked back to the desk and drank two sips of water: "This is the question of the structure and properties of matter. ”

"Oh oh......" Seeing that Yu Xuguang didn't mean to continue kicking, Wu Bin ran back and nodded again and again.

Then Yu Xuguang picked up the paper and continued: "This question also tested your calculations about crystals, the description and laws of the motion state of electrons outside the nucleus, as well as the configuration and hybrid orbitals of molecules. ”

"Awesome!"

Wu Bin didn't expect that there would be such a chemistry master in the class.

After speaking, Yu Xuguang rolled up the roll and knocked Wu Bin's head: "Congratulations first, I heard that you have a good score in the physics competition." ”

Wu Bin smiled after hearing this: "The teacher even knows you." ”

"Don't you know! Your teacher Cai just came to blow to me...... Finish chatting with you. At this time, Lu Gang, who had been in the theater mode on the side, interjected.

Yu Xuguang smiled and continued to say to Wu Bin: "Are you planning to make up chemistry now?" ”

"Yes." Wu Bin nodded.

"Where did you learn?"

"Just starting to look at organic compounds."

"Oh? That's a good progress, have you mastered all the previous ones? ”

"I can't say I have mastered it completely, but I basically understand it, and it's very basic."

With Cai Guoping's experience, Wu Bin's speech is absolutely watertight and humble.

"Oh~ I basically understand, right......" Yu Xuguang nodded slowly as he spoke.

Wu Bin, who saw this reaction, panicked, won't he test me again......

Wu Bin doesn't have +10 in chemistry, he is purely learning by relying on the lowest level of the system, and at most he relies on abstract thinking to improve the speed of learning, but it is definitely not as efficient as physics.

What he has to do now is to understand all the chemistry as a whole, and first score about 7 or 80 points, which can also be counted as an explanation from Bi Wanqing.

If Yu Xuguang were going to test him now, he really didn't have the confidence that Cai Guoping had at that time.

But fortunately, after Yu Xuguang nodded, he said with a smile: "Don't be self-taught, sometimes come and ask the teacher, it will save you a lot of detours." ”

Wu Bin, who breathed a sigh of relief, also nodded immediately: "Okay, teacher, I really plan to bother you during the lunch break tomorrow." ”

"Haha, okay, welcome, welcome." After Yu Xuguang finished speaking, he picked up a stack of rolls on the table, "Let's go, let's go down together, you can try to make this set of papers in the next class, and see how many points you can get." ”

"Okay."

The teachers and students returned to the classroom together, and the class bell rang just in time.

Yu Xuguang walked up to the podium slowly, put the roll on the podium and said, "Today we will make a set of Haibei rolls." After speaking, he looked in the direction of Wu Bin and said: "Wu Bin, if you have a lower score than the average score of the class this time, copy all the chemical equations of redox reactions, decomposition reactions, and displacement reactions that we have learned twenty times." “

"Huh!?" Wu Bin, who had just sat back in his seat, looked confused.

'Wait for me here!' ’

PS: There will be a chapter later~ ask for a recommendation ticket.