After taking the advice, I became a top student.

Liu Zhuoran dragged his tired body out of Rongcheng No. 2 Middle School.

He did terribly on his science exam a few days ago. If he had scored a few more points, he could have ranked in the top 300 in his grade and had a chance to get into university.

"I definitely need to catch up on my combined science subjects when I get back!"

Liu Zhuoran secretly made up his mind.

A dozen minutes later, after walking home and lying down on the sofa, Liu Zhuoran felt his whole body stretching out, and only at this moment could he feel that he was still alive.

"Never mind, never mind, I'm tired after a long day, I'll rest for half an hour before studying."

Liu Zhuoran took out his phone with a clear conscience, opened Douyin (TikTok), and soon, chuckles echoed from the sofa.

An hour passed in the blink of an eye.

He was suddenly jolted awake when he saw a live stream titled "[Speedy Science Completion from Zero, Day 3]".

"It's already past 10 p.m., and it's almost time to go to bed. I won't be able to study for much longer anyway, so I might as well play a little longer and study more tomorrow."

With that in mind, Liu Zhuoran resumed watching videos with a clear conscience.

A few seconds later, he was suddenly overwhelmed by regret, feeling that he shouldn't have fallen so low and that he still needed to study.

So he scrolled up again, went back to the live stream he had just been browsing, and clicked in. Anyway, he was learning whether he was learning on his own or watching other people's live streams, and maybe he could even learn something useful.

"Please don't worry, everyone. We'll give you half an hour to answer your questions."

As soon as Liu Zhuoran entered the live broadcast room, he saw the sixteen or seventeen-year-old host say something and then bury his head in his book.

Judging from the background, the place where he was doing the live stream was probably a large classroom.

I don't know which school it is, but they actually allow students to livestream in the classroom.

Liu Zhuoran made a critical comment before taking a closer look at the book the anchor was reading, which turned out to be a senior high school chemistry book.

Chemistry was his weak point, but he was only a freshman in high school. He couldn't possibly study chemistry in his senior year. Just as he was about to quit, he realized that the streamer wasn't studying at all; he was just putting on a show.

How can you learn anything by turning a page every ten seconds or so?

Quantum speed reading?

That's just too exaggerated.

"How can a live stream like this have such high viewership?"

It's still too easy to make money in the lower-tier markets right now!

Liu Zhuoran, from the perspective of a highly educated individual, pointed and commented on the live stream.

He decided to give it a thorough critique.

Soon, the comments section of the live stream opened Liu Zhuoran's eyes even wider.

There are five short-period main group elements: A, B, C, D, and E, whose atomic numbers increase sequentially...

Adding a few drops of KSCN solution to 2 mL of 0.1 mol/L FeSO₄ solution produces no obvious change. Adding a small amount of chlorine water then turns the solution red. However, after standing for a period of time, the red color fades, and a small amount of bubbles are produced.

1. Write the ionic equation for the solution turning red after adding chlorine water.

2. Propose your hypothesis about the phenomenon of "red color fading and bubbles being produced", and design an experiment to verify your hypothesis.

3. When preparing FeSO₄ solution, a small amount of iron powder and dilute sulfuric acid are usually added. Please explain why.

4. If an acidic KMnO₄ solution is used to titrate an unknown concentration of FeSO₄ solution to determine its content, please indicate the endpoint phenomenon and analyze the impact (too high/too low) on the measurement result if air bubbles are present at the burette tip before titration and disappear after titration.

"??"

Liu Zhuoran was completely bewildered, not knowing what these people were doing.

At this moment, the boy who was reading finally raised his head.

"A friend gave me a few questions yesterday, which I didn't know how to answer at the time. But after a day of studying, I've figured out the last question, and now I'll explain it to you."

Don't bring up yesterday's question; I'll give you a new one. Please see the question.

Netizens aren't stupid; they certainly wouldn't give Chen Mo a day to look up the answers online and fool them. They wanted to give him questions on the spot and see his reaction, which would reveal his true abilities.

There are five short-period main group elements: A, B, C, D, and E, whose atomic numbers increase sequentially. Given:

① A can form molecules with the same number of electrons as B, C, and D. Among them, the molecule formed with C is tetrahedral.

② The simple hydrides of B can undergo combination reactions with the hydrates corresponding to their highest-valence oxides.

③ The elemental form of D is usually stored in kerosene in the laboratory.

④ The atomic radius of E is the smallest among the main group elements in the same period.

⑤ A compound formed by elements A, C, and E, which is a common bleaching agent and disinfectant.

1. Deduce what elements A, B, C, D, and E are respectively.

2. Write the chemical equation for the reaction between the hydride of B and the hydrate of its highest oxide.

3. Write the electron dot formula of the bleaching compound formed by A, C, and E, and explain its bleaching principle (compare with hypochlorous acid bleaching).

4. Design a simple experiment to verify that the acidity of the highest-valence oxide hydrate of element C is stronger than that of the highest-valence oxide hydrate of element A.

Chen Mo accepted all challenges without hesitation, and after looking at the questions, he quickly came up with an idea.

"First, element D is stored in kerosene, so D must be sodium (Na). The hydride of B can combine with the hydrate of its highest-valence oxide, which is a characteristic of the reaction between ammonia and nitric acid to produce ammonium nitrate, so B is nitrogen (N)..."

"So in the end, we can conclude that A is hydrogen (H), B is nitrogen (N), C is carbon (C), D is sodium (Na), and E is chlorine (Cl)..."

Liu Zhuoran's eyes widened.

Wow, the host has a pretty good foundation in chemistry!

Anyway, after listening to this explanation, he remembered quite a few points.

At that moment, he noticed that the anchor on the screen had a slight frown.

"For option ⑤, the bleaching agent might be hypochlorous acid (HClO), but it contains oxygen (O) but not carbon (C). Or it could be an organochlorine compound..."

I think the question might be flawed, or it might be intended for us to write HClO, while A, C, and E are interpreted as H, Cl, and O, with C being O?

Then C is not carbon. If C is O and A is H, H and O form H₂O, which is not a regular tetrahedron, violating ①.

Therefore, in this question, C is likely oxygen (O) and A is carbon (C), but C and A form CO₂ (linear), not a regular tetrahedron.

Did my friend copy the question incorrectly?

After analyzing the situation, Chen Mo looked at the camera and asked a question.

[Holy crap, I'm impressed. The streamer is really good. I deliberately changed the question to prevent the streamer from searching for the answer on Baidu, but I didn't expect the streamer to actually figure it out.]

I'm bowing down to the streamer! Even when I encounter a question with an error, I only think it's my own fault.

[Is this high school senior year material? The host didn't know it yesterday, but he knows it today. Does he really learn a year's worth of material in a single day?]

[I feel like they explained it even more clearly than our teacher...]

[Host, tell me honestly, were you pretending to be weak to deceive others? Was the zero score intentional?]

[Does "Starting from Zero" mean starting from scratch and then progressing at a rapid pace, like climbing a grade every day?]

Is this learning ability real? I'm reporting this; someone's cheating!

My mom asked me why I was kneeling while looking at my phone, and I showed her this. She told me to use my phone more often in the future...

Chen Mo looked at the nutrient prompt that appeared in front of him, then glanced at the prophets in the live stream chat, smiled and said goodbye to everyone, and then prepared to end the broadcast.

[Host, we've finished high school chemistry. What will we study tomorrow?]

"Let's start learning physics tomorrow!"

Chen Mo gave a preview before the show ended.

He knew that these netizens would probably collect some physics questions to test him tomorrow, but he couldn't be happier.

After turning off the live stream, Chen Mo slung his backpack over his shoulder and started running back to his dormitory.

"Are we starting physics lessons tomorrow?"

Meanwhile, in the Qingfeng Times City residential area, less than three kilometers from Rongcheng No. 1 Middle School, Jiang Fan looked at the "Live broadcast has ended" message on his phone and muttered to himself.

As a physics competition coach at Rongcheng No. 1 High School, he immediately recognized that the live streamer was broadcasting from the competition class classroom on the first floor.

Judging from this student's answers to chemistry questions today, his foundation in science is not weak; at least his chemistry is quite good. He analyzes problems clearly and thinks quickly, making him a promising student.

He was just wondering how his physics was going, and his mind started to wander.

He certainly didn't believe that the streamer had really started from scratch and learned the content of an entire grade level in a single day; even a god couldn't learn that fast.

But the level he demonstrated was quite good, even if he didn't learn from scratch.