After all, in the first experiment, Mr. Jiang didn't seem to be so refined for these scales.

Whatever it was, it seemed to be poured into the Erlenmeyer flask, which served as a reactor.

Then, after a period of adjustment, Mr. Jiang's face gradually calmed down, and it seemed that the level of the purple-black liquid in the pipette had reached the ideal height.

After Mr. Jiang completed this operation, he put his thumb against the smallest Erlenmeyer flask and said, "Okay, now everyone is ready to see the test phenomenon of this No. 2 Erlenmeyer flask, wait a minute, please tell the difference from the previous No. 1 Erlenmeyer flask." ”

After everyone agreed, Mr. Jiang put the pipette on the Erlenmeyer flask, and then released the thumb on it.

After all the liquid flowed into the Erlenmeyer flask, a trace of arc appeared at the corner of Mr. Jiang's mouth.

However, the children's attention was not on Teacher Jiang's expression.

Because, the variation in the Erlenmeyer flask is very attractive.

After the purple-black solution fell into the otherwise transparent solution, white foam suddenly began to rise in the entire Erlenmeyer flask.

The foam accumulates many times faster than the first time, and in a short time it bursts out of the mouth of the Erlenmeyer flask and piles up like toothpaste, while the purple-black color gradually disappears in these toothpaste-like foam accumulations, leaving only some yellowish traces.

However, the reaction continued, and the toothpaste-like thing continued to rush out of the Erlenmeyer flask, and soon, the columnar foam standing upright on the mouth of the Erlenmeyer flask collapsed, but the foam in the bottle was still pouring out.

It seemed like a very violent chemical reaction, and the toothpaste-like foam seemed to be the product of that reaction.

Just when everyone thought there was more foam to be produced, the whole experiment gradually came to an end, and the foam came out of the bottle more and more slowly, slower and slower.

After the reaction became weaker and weaker, Mr. Jiang looked around and found that everyone's mouths had become O-shaped.

Teacher Jiang smiled and said, "How is it, what is the difference between this experiment and the first experiment." ”

"The bubble is much bigger. Chen Quan immediately stood up and said.

Teacher Jiang smiled and said, "Well, that's right, it's indeed much bigger than the first one." But what's the reason for that?"

Zhou Wen thought for a while and said, "The second time you tried the teacher, you weighed these raw materials well, but the first time you didn't." ”

Teacher Jiang applauded and said, "This classmate is really good, I'll get to know you." ”

Then, Mr. Jiang walked up to Zhou Wen and opened the chemistry book that Zhou Wen borrowed.

"Zhou Yu said very well, everyone should take Zhou Yu as an example. Teacher Jiang said after reading the book.

"Zhou Yu is my brother, and I am Zhou Wen. Zhou Wen said with a smile.

"Then why is your brother's name in your book?" asked Mr. Jiang?

"Because, this is a borrowed book. Zhou Wen said with a smile.

"Uh, okay. I'm too anxious, in short, you answered very well, classmate Zhou Wen. Teacher Jiang said with a smile.

"By the way, I hope other students can be like Zhou Wen. Teacher Jiang continued.

Then, we started talking about the experiment.

It turns out that this is the most ornamental hydrogen peroxide catalytic test in the legend.

The resulting toothpaste-like foam is called "elephant toothpaste" by "chemistry enthusiasts".

However, it seems that after moving on to real knowledge, this content is always boring.

Then, he began to hold all kinds of bottles and cans and say the name.

In this way, Wu Zhenzhen can also understand why he had less contact with the laboratory before.

It turns out that most of the labware is only really fully exposed in chemistry class.

If you don't explain the role of various glassware in detail, you will only use all kinds of utensils when you walk into the laboratory.

And in this way, there may be a lot of undesirable consequences.

For example, if a pipette is used in different liquids without being cleaned, the liquids may react in the pipette, and the amount of liquid that is removed will not be as accurate. In addition, more often than not, the situation is actually more serious, as most reactions are exothermic and there is little space in the pipette, so it is easy to break the pipette.

For example, which utensils can and can't be heated also need to be clearly defined at the outset.

Otherwise, in the experimental class, the teacher will have a sense of helplessness when he watches the children holding various glassware and baking them on the alcohol lamp.

Therefore, in order to avoid this situation, in the class, Mr. Jiang especially emphasized: "Beakers cannot be heated directly, test tubes can be heated directly, and measuring cylinders, pipettes, jars and other utensils that transfer and store liquids cannot be heated." ”

Then, in Mr. Jiang's detailed explanation, everyone understood that the operation requirements of these laboratories are very important, and only by being familiar with these rules can we not make mistakes in the experiment.

However, the time seemed to be too short, and as soon as I had talked so much, the bell rang at the end of class.

Naturally, Mr. Jiang signaled to drag the class.

However, there didn't seem to be any unpleasant looks.

After all, the elephant toothpaste trial is indeed fascinating.

Then, Mr. Jiang smiled and said, "There are two things you have to do when you go home, the first is to go through the glassware I just talked about, and the other is to open the periodic table. ”

So, everyone turned to the color printing page of the periodic table at the front of the textbook.

Teacher Jiang pointed to the front element 20 and said: "The letters and Chinese of the front element 20 must be memorized, and I will specially ask you to write silently in the third class." ”

Yuan Li asked, "Mr. Jiang, what about the elephant toothpaste test?"

Teacher Jiang smiled and said, "Haha, there are a lot of things involved in the elephant toothpaste test, and if you want to fully understand it, you need high school." For now, I'm just using it as a window. And now the purpose has been achieved, so let's take a good look at the periodic table. ”

So, after Mr. Jiang left, everyone looked at the periodic table.

Naturally, the front 20 element "hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxyfluorine, neon. Sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon, potassium, calcium. It seems to read with a hint of rhyme, so after spending a few classes and finishing class, I barely memorized the five-character quatrain.

However, the corresponding English symbols are more troublesome.

After all, the current Wu Zhen seems to be more difficult in several other subjects.

Although there have been some breakthroughs in English, the situation is still that I can't memorize English words, so it is indeed difficult to understand these abstract symbols.

However, Wu Zhen understands that if this is not done well, then he will not be able to learn this chemistry that seems to be more interesting. After all, such content is certainly the most basic.

Walking on the way home at noon and Li Zengfan pumping the Chinese character names of the elements to each other, Wu Zhenzhen had no problem.

However, there still seems to be little that can be done about symbols.

After all, the chemical symbol comes from the Latin initials.

So, after the two were busy for a while, Wu Zhenzhen said helplessly: "This Chinese character is still barely memorized, but this English alphabet is really troublesome." Some are one letter, some are two, and I really can't stand it. ”。

Li Zengfan smiled and said, "Hey, this is indeed a problem, but it's only been half a day, isn't it the third chemistry class that was written silently?"

Wu Zhenzhen said: "Well, I hope." ”