Police Detective

???? Today's course is a relatively basic course. At first, Bai Song was distracted. After the book was in his own hands, he lost his mind and listened more seriously.

　　???? In the entire classroom, only two people did not attend the class...

　　???? One is not listening at all, the other is not listening.

　　???? Bai Song knows the notes in the book. Although they are simple strokes for girls, he must analyze them carefully. It may take two days.

　　???? This is the gap between professional and amateur.

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

　　???? Compared to people who are not majors in chemistry, they know something. But any chemistry undergraduate who studies well can slap him casually.

　　???? Scientific development has been subdivided enough, 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.

　　???? Anyone present here who understands the principle of chemistry can dabble in high school chemistry, but no one shows the willingness to listen.

　　???? This theorem is very simple: in a reaction that has reached equilibrium, if one of the conditions that affect the balance is changed, the balance will move in the direction that can weaken the change.

　　???? Le Chatelier's principle, Newton's first law and Lenz's law are very similar, and they are all laws of inertia.

　　???? In other words, there is inertia in chemical reactions, classical mechanics, and electromagnetics. When accelerating, there is "resistance" (that is, inertia) to limit your acceleration, and when you want to decelerate, there will be inertia to limit your deceleration.

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

　　???? In the planning stage, there is inertial resistance to planning a huge case. The more you plan, the greater the effort you need to pay. 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 by trying to understand the case as early as possible while the case is still moving, while the objective conditions still exist and the speed has not yet returned to zero, and then take the person away.

　　???? "After explaining this basic chemical principle, I want to ask you first, how many people have a certain understanding of this principle before attending the class?" Professor Tang briefly chatted with everyone.

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

　　???? When Professor Tang saw this, he understood, and then...

Then he asked: "So, now that I have finished speaking, do you have any questions about this principle?"

　　???? There is no next question.

　　???? This is indeed a very basic chemical principle. It is normal for no one to ask questions, and everyone can master this scientific principle.

???? Professor Tang nodded, and then asked: "The classmates are here, some are PhD students in the Department of Chemistry, and some are non-chemistry majors. They are also very interested in chemistry when they come here. Then I have to talk to you After chatting, what is chemistry? Does anyone want to talk about it?"

The class was still very active. Several students got up to express their opinions. Some only expressed that chemistry is a science, and some mentioned that chemistry is a reaction process for creating new substances. , More people talk about the definition.

The atmosphere in the class is very good. Professor Tang was very happy. Seeing the classmates talked about it, he said, "Maybe many people have also heard about it. I left school for a while. Outside, I have a book. Tan has also seen a lot of things.

　　???? In the school, there are excellent college students like you, as well as some professors and teachers who have made great achievements in various fields, but after all, they are high in the temple.

　　???? Some time ago, a woman who was a little older than me came to me and bought a cookbook. I also chatted with her a few words. She mentioned an acid-base food theory and told me that vinegar is an alkaline food, and she vowed to share the theory with me.

　　???? This makes me feel very interesting, hasn't chemistry changed so much after I left school for more than half a year? "

　　???? Sparse laughter.

　　???? Professor Tang paused: "Many classmates didn't laugh. Are they also suspecting that what she said is reasonable?

　　???? The subject of chemistry is actually very interesting.

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

　　???? I have read a middle school chemistry book. There is a chemical substance like tetrahydronitrogen, which of course does not exist at present, but it still does not affect the middle school students to do the questions.

　　???? It’s just that we can’t laugh at the simple knowledge we’ve learned. As a science, even the first lesson in junior high school has its truth.

　　??? We know that all substances, even clean water, are chemical substances. We know that matter is composed of atoms, and we also know that matter does not arise out of thin air, let alone disappear out of thin air.

　　??......

?? These are all right, even in the field of mass-energy 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 metals can be catalyzed into gold;

　　???? Some people believe that water can be catalyzed to produce hydrogen and then enter 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 professional terms such as various health products and enzymes.

　　???? The most interesting thing is that many of our students ~www.wuxiaspot.com~ will believe in some scams that have turned a few turns. "

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

　　???? Chemistry is always a rigorous science. When you are studying it, you can always question it and try to discover new problems. However, you can't let what you learn doesn't belong to you.

　　???? Don’t think that this kind of thing will not happen to everyone, let me ask, are there any girls who are students? "

　　???? A dozen girls in the classroom raised their hands.

　　??? "Then, from a biological point of view, what is the use of a facial mask for the skin?"

　　???? More than a dozen girls didn't even talk...

　　???? From a scientific point of view, it is useless! However, these girls are using...

　　??? "Then I will ask everyone again. Many people think that eating pig skin or even fish gelatin can replenish collagen. Do you think this is correct?"

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

???? "Speak louder." Professor Tang recognized the answers of several people: "We all learn science, we must believe in science. The human body has never been able to directly absorb protein, no matter what protein it is, it reaches the stomach. They are all digested into polypeptide chains and then broken down into amino acids. Eating so-called "high collagen" foods is actually not as good as eating eggs."

　　???? In the university classroom, these words that were almost refuting the rumors made many people think deeply.

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

　　????