[Quick Transmigration] Soul Exchange

"Okay, I'll read a question for you to do, raise your hands when you're done, and get out of class will be dismissed if you're right."

Hearing the word "end of get out of class", the students who were dozing off just now immediately regained their energy.

The teacher shook his head helplessly, and began to read the question, "There is a mixed solution aL of barium chloride and sodium chloride. Divide them into two equal parts. Add dilute sulfuric acid solution to one part to completely precipitate the barium ions. Add silver nitrate solution dropwise to completely precipitate chloride ions. The reaction consumes Xmol of dilute sulfuric acid and Ymol of silver nitrate, and find the amount of sodium ions."

As soon as his words fell, there was only the "rustling" sound of the pen grinding on the paper in the classroom.

In less than 2 minutes, Qin Yijun raised his hand, followed by Li Sihan.

The teacher walked over, glanced at their answers, nodded and said, "That's right, you two are really quick at thinking!"

As for Liu Shuangshuang, who was their tablemate and did not sleep at noon, his mind was already a mess.

"Qin Yijun, let's go for a run!"

Hearing Li Sihan's lowered voice, she felt a little irritable.

I saw Qin Yijun shaking his head, "I don't want to go today."

She couldn't help but feel a little joy.

After a while, Liu Shuangshuang, who found that her thoughts had gone completely astray, beat her head angrily: What the hell was I thinking?

Qin Yijun thought she was worrying about not being able to solve the problem, so he pulled a chair and came over and said, "Do you want me to teach you?"

Before she could speak, he pointed to her draft paper and said, "a is an interference item. The amount of sodium ions in the two solutions is equal, just find one. The barium ions in the first part are Xmol, so the second part Sodium ions are (Y-2X) moles, so sodium ions are 2(Y-2X)."

"..."

Liu Shuangshuang thought, her expression must be dull and ignorant.

"The barium ion in the first part is Xmol, I know this, why the sodium ion in the second part is (Y-2X) mol"

"..."

Qin Yijun frowned, and then said with a face of reason, "There is another reason, didn't the title tell you?"

Liu Shuangshuang looked at him inexplicably: Fortunately, my teacher is not you!

Hurt by her vaguely disgusted eyes, Qin Yijun was about to say something when Li Sihan suddenly poked his head over and whispered, "Oh, Shuangshuang, you are so stupid! The amount of chloride ion is equal to the amount of silver nitrate is Ymol , the amount of barium chloride substance equal to that of dilute sulfuric acid is Xmol, so the amount of chloride ion substance in barium chloride is 2Xmol, isn’t the amount of chloride ion substance in sodium chloride just (Y-2X)mol? And the amount of sodium ion in sodium chloride is equal to the amount of chloride ion is (Y-2X) mol, isn't the two solutions equal to 2 (Y-2X) mol? You have calculated such a simple question for so long , How stupid! Do you understand now?"

What Li Sihan said was so clear, of course it was impossible for Liu Shuangshuang not to understand, but she could not be happy when she understood.She knew Li Sihan's outspoken and carefree personality early on, and she was envious of it before, but now she feels a little bored.Although she also knew that her brain was slow to respond, Li Sihan still felt uncomfortable when Li Sihan repeatedly said that she was stupid in front of Qin Yijun's face, and even felt that she did it on purpose.However, when he met Li Sihan's bright and clear eyes, Liu Shuangshuang felt that he was treating the heart of a gentleman with the heart of a villain.

Hey, maybe it's time for her to adjust her mentality.

The get out of class bell rings, the class bell rings.

Behind the podium is a blackboard full of homework.

Qin Yijun glanced at it, and continued to bury his head in the desk to watch his TV series.

Liu Shuangshuang moved her lips, but still didn't have the nerve to speak out to persuade her, and turned her head away out of sight.

After that, she spent four to ten minutes solving the most difficult math homework. She just took out her notebook and started to practice calligraphy. After writing twice, the refill suddenly ran out of oil.Then I searched through the schoolbags, desks and cabinets, but couldn't find a replacement. Just as I was thinking about whether to ask Qin Yijun to borrow it, I caught a glimpse of the class teacher standing at the door, looking inside like a ghost.

Liu Shuangshuang collected herself, turned sideways as if nothing had happened, poked her deskmate who seemed to be looking for something, and said in a very low voice, "The teacher is here."

Qin Yijun froze at first, then flipped through the bookcase twice in a decent manner, and finally took out an English exercise book ABCDDAC and filled it in.

Liu Shuangshuang can assure you that he did not read the questions.

At this moment, the class teacher came over, nodded in relief, and walked over.

Liu Shuangshuang: "..."

Qin Yijun took a long breath and said to her, "Thank you."

Liu Shuangshuang squeezed out two words with difficulty: "No thanks."

After such an interruption, Liu Shuangshuang's desire to borrow pens also rested. She opened the Chinese textbook and read "Li Sao" silently three times, and the bell rang for the end of get out of class.

Qin Yijun packed up his things and stood up. Liu Shuangshuang moved the chair to make room for him. The latter ran out and came back again, "What are you having for dinner?"

"Uh...you should go downstairs and buy something casually."

"Oh."

Qin Yijun answered without hesitation, and ran away again.

Li Sihan, who had a panoramic view of this scene, bit his lips, and asked seemingly unintentionally, "Shuang Shuang, when did you and Qin Yijun become so close?"

Liu Shuangshuang blinked, "Is there?" She said it calmly, but her heart beat faster, and a little blush appeared on her face.

Seeing this, Li Sihan's eyes dimmed, he walked over and put his arms around her shoulders, and whispered in her ear, "Shuangshuang, do you like—"

Hearing the word like, Liu Shuangshuang immediately stood up guilty, and said to Li Sihan embarrassedly, "Well, I forgot that I have to go out to buy refills, so let's go first."

Li Sihan looked at her back with a complicated and unwilling expression, but quickly restrained himself completely.

Liu Shuangshuang ran to her usual stationery store, picked up her usual pen refills, and was about to check out at the door, when she suddenly saw a handmade paper on the bottom shelf, with "Seven Steps" printed on the cover. Teach you how to fold a love letter" in color, she squatted down in a mysterious way, and hugged it in her arms.

"Five pen refills are four and five yuan. This is..." The proprietress turned over the handmade paper and glanced at the label. "This is five yuan. It's nine and five yuan in total. I'll give you nine yuan."

Liu Shuangshuang took out ten yuan and handed it over, "Thank you boss."

The proprietress teased while looking for money, "The little girl is in love, so don't delay your studies!"

Liu Shuangshuang blushed instantly, took the money, picked up the bag and ran out.

"Hahaha..." Behind her was the hearty laughter of the proprietress, "What a cute little girl!"

The author has something to say:

The chemistry problem is quack quack found on Du Niang~~~