Xiao Fei was mysteriously busy during this time, writing and drawing, I didn't know what I was busy with, and I didn't pay attention to it, until one day, I heard the friends in the gang talk one after another: "Xiao Fei, this guy, is quite powerful." Pen, fun, pavilion www. biquge。 info is really self-taught, and he went to a private school to become a gentleman?"

I hurriedly asked for the specific address, hurried over, and couldn't wait to look out the wooden lattice window, and it was really so. Xiao Fei was talking about something on it, and there was a group of Song children wearing large-framed protective glasses and wearing small robes of various colors around below, who were looking like each other, meticulously doing something there, and couldn't see it really, only to see a burst of clouds steaming in the air, fogging, sometimes overflowing with fire, sparks splashing. A closer look reveals that this is not a witchcraft show, but a real chemical experiment, with the constant gushing of gas from the flask and the brilliant flames of the flames. If you don't take a closer look at the shapes of the old doors and chairs, you really think that you are back in the physics classroom of modern society.

It seems that this Xiaofei has finally been reborn under my long-term exposure and education, and has successfully changed from a thief who makes people gnash his teeth to a very young and glorious teacher of the Great Song Dynasty. However, there is no such title here, just Mr. Private School, but he is too young, and these children call him Brother Xiaofei.

I saw Xiao Fei's eyebrows dancing and talking, these ancient students were very interested and tirelessly studied these chemical knowledge from modern society. Not only was it crowded with many children, but even many older children joined in, and they were also eye-opening, and they had never taken such a novel course.

He began to say in a vivid voice: "Dear students, through the above study, you must like chemistry very much, then let's do an interesting experiment by ourselves, the title of this experiment is called Little Charcoal Dancing, I will do it first, and then you will follow along, how about it?" "Okay, Brother Xiaofei, you can do the experiment quickly, we are all impatient." Here's what happened. He methodically took out the iron frame, the alcohol lamp, and the test tube, and then began to do the experiments in a hurry. Xiaofei took out a test tube, and then carefully put a small amount of solid potassium sulfate, heated the test tube with an alcohol lamp, and after the solid ** gradually melted, he took a piece of charcoal the size of a small bean grain, put it into the test tube, and continued to heat. After a while, you will see the small charcoal cube suddenly jump up and down on the liquid surface of the test tube, sometimes up and down, and sometimes flip itself, like a beautiful dance, and the test tube glows with a burning red light, which is really interesting. This highly ornamentable experiment made all the Da Song children below cheer, they had never seen such a magical experiment. The children also finished the experiment by drawing a scoop with a gourd.

Xiao Fei asked at the right time: "May I ask the children, can you answer why Xiao Charcoal can dance?"

Those big Song children were all dumbfounded, where did this come from, they couldn't say why, this was not unexpected by me and Xiaofei, if they hadn't studied chemistry, even the children of modern society couldn't answer, let alone in this big Song society that only opened one course, that is, Chinese class? It is reasonable that they can't answer.

Xiao Fei smiled indifferently and said unhurriedly: "In fact, when the little charcoal was first put into the test tube, the temperature of the ** in the test tube was low, and it failed to make the charcoal burn, so the little charcoal was still lying there quietly." After the test tube is heated, the temperature rises, so that the small charcoal reaches the ignition point, and a fierce chemical reaction occurs with **, and a large amount of heat is released, so that the small charcoal immediately burns and glows. **After decomposition at high temperature, oxygen is released, and the oxygen immediately reacts with the small charcoal to form carbon dioxide gas, which immediately lifts the small charcoal. After the charcoal jumps, it is out of contact with the **liquid below, and the reaction is interrupted, so the carbon dioxide gas no longer occurs, and when the small charcoal falls back to the ** due to the action of gravity, the reaction occurs again, and the small charcoal jumps up for the second time. This cycle repeated, and the little charcoal kept jumping up and down. ”

These little guys of Da Song nodded as if they didn't understand, and their dark eyes flashed with infinite curiosity.

Xiao Fei nodded with satisfaction, and then said, "Ladies and gentlemen, let's do another interesting experiment." Did you see, what's in my hand?" The little ones said it without thinking.

"Yes, sugar is a substance that everyone often eats, it is a small white particle, like snow in winter. However, I was able to turn the commonplace into a black pile of snow in no time. ”

The children said in unison, "Brother Xiaofei, how is this possible? ”

Xiao Fei said confidently: "Then let's wait and see." Xiao Fei's skillful techniques are all due to his agile movements when he was a thief, just like a magical magician, he gently put a small amount of white sugar into the beaker, and then drop a few drops of heated concentrated sulfuric acid, the white sugar as white as snow turned into a pile of fluffy black snow, in the sneering sound of heat and bubbling, the volume of black snow gradually increased, and even filled the beaker. Everyone was jaw-dropping and amazed, followed by prolonged applause.

Xiao Fei still asked, "Who knows where the mystery of this place is?" Everyone was talking a lot, and they didn't know what was going on.

I hurriedly said outside the window, "I know. Xiao Fei was surprised and said, "You're here too?" I deliberately pouted and said, "Such a good thing, don't call me, do you want to be a person with peach and plum all over the world?" Let's get down to business, this is due to the dehydration chemical reaction between white sugar and concentrated sulfuric acid. Concentrated sulfuric acid has a particularly quirky hobby, that is, it especially likes water. Not only does it make full use of the moisture in the air, but it also does not let go of the moisture in other substances, and as long as it meets, it will not achieve its goal. White sugar is a kind of carbohydrate, and when it encounters concentrated sulfuric acid, the water in the white sugar molecules is immediately taken away by it, and the poor white sugar is left with charcoal and turns black. After the concentrated sulfuric acid took the water for itself, it was not satisfied, and it oxidized a part of the remaining charcoal in the sugar, and carbon dioxide was generated. c+2h2so4=2h2o+2so2+co2。 As the carbon dioxide and sulfur dioxide gas produced by the reaction escape, the volume grows larger and larger, and finally it becomes fluffy black snow. ”

After I finished chattering, the children below nodded in agreement as if they didn't understand.

I also assisted Fei in the fountain experiment of ammonia dissolving in water. Collect the ammonia, cover it with a single-hole rubber stopper inserted into the glass tube, then turn the flask upside down, insert the glass tube into the water with phenolphthalein, cover the flask with your hand, and you can see the beautiful red fountain gushing out.

They also performed the handkerchief experiment that could not be burned, because the alcohol burned when it was on fire, releasing heat, causing a large amount of alcohol and water to volatilize, taking away part of the heat. Heat dissipation when the handkerchief is shaken from side to side. In this way, the temperature of the flame is lowered and the ignition point of the handkerchief cannot be reached. So we worked hard to burn the fire for a long time, the handkerchief was still intact, and the children began to burn their robes according to the map.

Then we ended this interesting chemistry class in ancient times with a performance of spitting fire like Peking Opera. A layer of colored plastic tube is placed over a long-pointed glass tube, and a cotton ball full of gasoline is placed in the tube. Hold the needle-nosed tube against the alcohol lamp flame and blow into the other end of the tubing. When the gas comes out of the nozzle tube, it burns when it encounters fire. Leave the flame and continue burning. If the blowing force is slightly higher to the glass tube, the flame can move 5 cm away from the tip and appear as a bright blue flame. The beautiful blue flame reflects the vigorous smiling faces of the children of the Great Song Dynasty, allowing us to see infinite hope, our existence is valuable, which can make the ancient Great Song people burn their interest in science from an early age, so as to be more passionate, creative, change themselves, change the Great Song Dynasty, and change the whole world.

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