Datang: I was exposed by Princess Changle

OK!

This red brick is good!

……

Emperor Tang University.

On the blackboard, various equations are written.

Lin Xuan was speaking slowly.

Lin Xuan happened to be at school today, so the dean came to invite Lin Xuan to teach the students a lesson.

Lin Xuan was also a little interested when he was free, so he agreed.

Although there is no physical education class, no one has any complaints.

Being able to come to Lin Xuan's chemistry class proved their ability.

One in a thousand is not an exaggeration.

No one else can come if they want to.

Walking in the campus, they all held their heads high.

The nostrils are raised higher than the other.

Without him, they are the rocket class of Emperor Tang University!

The elite of the elite!

Although they didn't know what a rocket was, what Lin Xuan said was that it was very powerful.

The rocket class sounds really awesome!

So far, there are only about 40 formal students in the chemistry class.

Selected from more than [-] students.

And these more than 3000 students were selected from more than 10 people.

Therefore, Lin Xuan also placed high hopes on them.

They are also well paid.

Become his student and get two hundred dollars every month.

Twice that of other students.

The rest of the treatment is also very high, for example, you can enter the laboratory.

The laboratory was built by Lin Xuan to the best of his ability.

There are also various jars and beakers.

If they wanted to go in, they had to get Lin Xuan's consent.

Like others, they are not qualified to enter at all.

After entering, they must strictly follow the rules of the laboratory.

For the first time, plagiarize the laboratory rules.

Those who commit the crime a second time will no longer be allowed to enter the laboratory.

Lin Xuan has high demands on them to let them know the dangers of chemical experiments.

Don't be joking.

Fortunately, the effect is still good.

Only Cui Hao, a fool, made a mistake once, and no one else did.

"Oxidation reaction, this is a very common phenomenon."

"To put it simply, iron will rust, which is an oxidation reaction."

"Copper is oxidized to black copper oxide in humid air, and then the copper oxide continues to react with carbon dioxide in the air to become green basic copper carbonate."

"The principle of silverware is similar."

Cui Hao couldn't help raising his hand and asked, "Professor Lin, what should we do when the copper rusts?"

Lin Xuan replied calmly after hearing the words: "You should remember that I said acid-base neutralization reaction."

"The surface of copper is basic copper carbonate, so in addition to polishing, it can also be solved by chemical equations."

"For example, you can use a cloth soaked in vinegar, and then add an appropriate amount of salt to remove it."

"The equation is as follows."

Lin Xuan wrote it in a swish.

"But remember, you can't soak it for a long time, otherwise it will damage the copper itself."

"If you are interested, you can go back and try it yourself."

Lin Xuan smiled.

The students below all suddenly realized, and nodded and recorded it.

It is a common phenomenon in life itself, and it can make them more interested.

Then Lin Xuan carefully took out a jar.

"This thing is called concentrated sulfuric acid."

"It's a purified substance. You must remember that when using it for experiments, don't touch it."

"Let me show you what kind of chemical reaction will happen if people touch it."

As one of the three acids and two bases, sulfuric acid has a great effect.

Sooner or later they will come into contact.

Therefore, Lin Xuan also took it out in advance.

He didn't talk about the specific principle, but first demonstrated its danger.