Today's class is some relatively basic class, Bai Song was still distracted at first, and then after the book arrived in his hand, he had no other thoughts, and he listened more seriously.

In the entire classroom, only two people did not listen to the class...

One is that you don't have to listen at all, and the other is that you can't listen.

Bai Song knew that these were marked in the book, although it was a few simple strokes for the girl, but he definitely had to analyze it carefully, and it was estimated that it would take two days.

That's the difference between professional and amateur.

What is the level of chemistry that Bai Song has learned these days?

If you know something more than a non-chemistry major. But any chemistry undergraduate who studies well can beat him casually.

Scientific development has been sufficiently segmented that it has long been impossible for anyone to master the knowledge of all industries.

At this point, Professor Tang talked about Le Chatre's principle.

Anyone here who studied chemistry understands this principle, and there is a dabbling in high school chemistry, but no one shows a willingness not to listen to it.

The theorem is simple: in a reaction that has reached equilibrium, if one of the conditions affecting the equilibrium is changed, the equilibrium will move in a direction that can attenuate the change.

Le Chatre's principle, Newton's first law, and Lenz's law are very similar in that they are all laws of inertia.

That is, in terms of chemical reactions, classical mechanics, and electromagnetism, there is inertia. When accelerating, there is "resistance" (i.e., inertia) to limit your acceleration, and when you are about to slow down, there is also inertia to limit your deceleration.

And Bai Song also has his own explanation of this principle.

For a huge planning case, there is inertial resistance in the planning stage, and the more planning you have, the greater the effort you need to pay. And after the case is over, if you want to stop the case, there is still inertia that will restrict the termination of the case.

The police solve the case while the case is still moving, take advantage of the limitations of objective conditions still exist, and take advantage of the fact that the speed has not yet returned to zero, to understand the case as early as possible, and then arrest the person.

"After talking about this basic chemical principle, I would like to ask you first, how many people have a certain understanding of this principle before listening to the lecture?" Professor Tang had a brief chat with everyone.

After Professor Tang finished speaking, almost half of the students raised their hands.

When Professor Tang saw this, he generally understood, and then asked, "So, now that I'm done talking, do you have any questions about this principle?"

None of the next questions were asked.

This is indeed a very basic principle of chemistry, and it is normal for no one to ask questions, and everyone can grasp this scientific principle.

Professor Tang nodded, and then asked, "Some of the students are doctoral students in the Department of Chemistry, and some are non-chemistry students, and they are also very interested in chemistry when they come here, so I want to talk to you first, what is chemistry?

The class was still very active, and several students got up to express their opinions, some just expressed that chemistry is a science, some mentioned chemistry as a reaction process to create new substances, and more people said the definition.

The atmosphere in the class was very good, Professor Tang was very happy, and when he saw that the students were chatting about it, he said: "Many people may have heard of it, I left the school for a while a while ago, and outside, I have a bookstall and have seen a lot of things.

In the school, there are excellent college students like you, and there are also some professors and teachers who have made great achievements in various fields, but after all, they are at the top of the temple.

Some time ago, a woman who was a little older than me came to me and bought a cookbook, and I talked to her for a few words. She mentioned a theory of acid-base food, told me that vinegar is an alkaline food, and swore to share it with me.

It makes me wonder, is chemistry so much better than half a year after I left school?"

Sparse laughter.

Professor Tang paused: "Many students didn't laugh, are they also doubting that what she said is reasonable?"

Chemistry is actually a very interesting subject.

When you go to high school, you will find that many things in junior high school are wrong, and when you go to college, many high school knowledge points are wrong.

I once read a chemistry book in middle school, which has the chemical substance tetrahydride and nitrogen, which of course does not exist at the moment, but it still does not affect middle school students.

It's just that we can't laugh at the simple knowledge we have learned, as a science, even the first lesson from junior high school, it has its truth.

We know that all substances, even clean water, are chemicals. We know that matter is made up of atoms, and we also know that matter does not come into being out of thin air, let alone disappear out of thin air.

These are all true, even in the field of mass transformation, you can't say that this is wrong.

However, during this time, I found a lot of interesting words.

Some people believe that some other metal can be catalyzed into gold;

Some people believe that water can be catalyzed to produce hydrogen, which then enters the hydrogen fuel cell to drive the car forward;

Some people believe that eating a little barbecue can cause cancer;

There are also people who are superstitious about various health products, enzymes and other professional terms.

The most interesting thing is that many of our students, faced with some scams that have turned a few corners, will believe it. ”

Professor Tang said a lot, and the conversation changed: "So, what is chemistry?"

Chemistry is always a rigorous science, and when you study it, you can always question it and try to discover new problems. However, you can't let what you've learned don't belong to you.

Don't think that this kind of thing won't happen around you, let me ask, are there any girls here who are students?"

More than a dozen girls in the classroom raised their hands.

"So, biologically speaking, what exactly is the use of a mask for the skin?"

None of the dozen or so girls spoke...

From a scientific point of view, it's not a little bit useful! But these girls are using...

"Then let me ask you again, many people think that eating pig skin or even fish gelatin can supplement collagen, do you think this is correct?"

"Incorrect. Finally, a few people mustered up the courage to answer.

"Be louder. Professor Tang agreed with the answers of several people: "If we all study science, we must believe in science." It is never possible for the human body to directly absorb protein, no matter what kind of protein it is, it is digested into polypeptide chains and then broken down into amino acids in the stomach. Eating those so-called 'high collagen' foods is, in fact, not as good as eating eggs. ”

In the university classroom, these words that almost refute rumors have made many people think deeply.

After studying for so many years, how can you be stupid?