Today's classes were some relatively basic lessons. Bai Song was distracted at the beginning, but after the book came into his hands, he no longer had any other thoughts and listened more seriously.
In the whole classroom, there were only two people who didn't listen to the class...
One is that you don’t need to listen at all, and the other is that you can’t listen.
Bai Song knew that these things marked in the book were just a few simple strokes for a girl, but he would definitely have to analyze them carefully, and it would probably take him two days to read them.
This is the difference between professional and amateur.
What is Bai Song's level of chemistry that he has studied these days?
Compared to people who are not majoring in chemistry, he still knows something, but any good chemistry undergraduate can easily beat him.
Scientific development has become sufficiently segmented that it has long been impossible for anyone to master the knowledge of all industries.
At this moment, Professor Tang talked about Le Chatelier's principle.
Everyone here who studies chemistry understands this principle; it is covered in high school chemistry, but no one has expressed an unwillingness to listen.
The theorem is simple: in a reaction that has reached equilibrium, if one of the conditions that affect the equilibrium is changed, the equilibrium will shift in a direction that will weaken the change.
Le Chatelier's principle, Newton's first law, and Lenz's law are very similar, and are all laws of inertia.
That is to say, inertia exists in chemical reactions, classical mechanics, and electromagnetism. When you accelerate, there is "resistance" (that is, inertia) to limit your acceleration, and when you slow down, there is also inertia to limit your deceleration.
Bai Song also has his own explanation for this principle.
A large-scale case has inertial resistance during the planning stage. The more you plan, the more effort you need to put in. And after the case is over, if you want to stop the case, inertia will still limit the termination of the case.
When the police solve a case, they have to understand the case as much as possible in advance while the case is still moving, while the constraints of objective conditions still exist and while the speed has not yet returned to zero, and then arrest the person.
"After explaining this basic chemical principle, I would like to ask everyone, how many people have a certain understanding of this principle before listening to the class?" Professor Tang chatted briefly with everyone.
After Professor Tang finished speaking, almost half of the students raised their hands.
Professor Tang understood the general idea after reading this, and then asked: "Well, now that I have finished my explanation, do you have any questions about this principle?"
There is no next question either.
This is indeed a very basic chemical principle. It is normal that no one asked questions. Everyone can master this scientific principle.
Professor Tang nodded and asked, "Some of the students here are doctoral students in the Department of Chemistry, and some are students from non-chemistry majors. They are also very interested in chemistry. So I want to talk to you first. What is chemistry? Is there anyone willing to talk about it?"
The class was still very active. Several students stood up to express their opinions. Some simply said that chemistry is a science, some mentioned that chemistry is a reaction process for creating new substances, and more people gave a definition.
The classroom atmosphere was very good. Professor Tang was very happy. Seeing that the students had almost finished chatting, he said, "Maybe many people have heard that I left school for a while some time ago. I had a bookstall outside and saw a lot of things.
In 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 they are ultimately in high positions.
Some time ago, a woman who was a little older than me came to me and bought a cookbook. I chatted with her for a while. She mentioned a theory of acid-base food and told me that vinegar is an alkaline food. She also shared the theory with me with great confidence.
This makes me feel very interesting. Has chemistry changed so much in the more than half a year since I left school? "
Sparse laughter.
Professor Tang paused and said, "Many students did not laugh. Are they also doubting whether what she said makes sense?
The subject of chemistry is actually very interesting.
When you go to high school, you will find that many things you learned in junior high school are wrong, and when you go to college, many high school knowledge points are wrong.
I once read a high school chemistry textbook, which mentioned a chemical substance called tetrahydronitrogen. Of course, it does not exist at present, but it still does not affect the problem solving of high school students.
However, we cannot laugh at the simple knowledge we have learned. As a science, even the first lesson in junior high school has its reasons.
We know that all matter, even pure water, is chemical. We know that matter is made up of atoms, and we also know that matter cannot be created out of nothing, let alone disappear.
These are all correct. Even when it comes to the field of mass-energy conversion, you cannot say that this is wrong.
However, during this period of time, I discovered a lot of interesting things.
Some people believe that some other metals can be catalyzed into gold;
Some people believe that water can be catalyzed to generate hydrogen and then enter the hydrogen fuel cell to drive the car forward;
Some people believe that eating a little grilled meat can cause cancer;
Some people are superstitious about various health products, enzymes and other professional terms.
The most interesting thing is that many of our students will believe some of the scams that have been twisted a few times."
Professor Tang said a lot, then changed the subject: "So, what is chemistry?
Chemistry is always a rigorous science. When you study it, you can always question it and try to find new problems. However, you cannot let what you learn not belong to you.
Don't think that this kind of thing won't happen to you. Let me ask, are there any female biology students here?"
More than a dozen girls in the classroom raised their hands.
"So, from a biological point of view, what exactly do facial masks do for the skin?"
There were more than a dozen girls and not a single one of them spoke...
From a scientific point of view, it is of no use at all! However, these girls are using it...
"Then let me ask you again, many people think that eating pig skin or even fish glue can supplement collagen. Do you think this is correct?"
"Not correct." Finally, a few people mustered up the courage to answer.
"Speak louder." Professor Tang approved of several people's answers: "We are all studying science, so we must believe in science. The human body can never absorb protein directly. No matter what kind of protein it is, it will be digested into polypeptide chains in the stomach and then broken down into amino acids. Eating those so-called 'high-collagen' foods is actually not as good as eating eggs."
In the university classroom, these words, which were almost meant to dispel rumors, made many people think deeply.
How come you have become stupid after studying for so many years?
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