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Great silence, everyone stunned to see Li Zhen, looking at the red thick neck Qideng Ming.
This ...... This is amazing.
This phenomenon is already hot ice very magical. Li Chen did not expect to actually be able to hit the nail, he does not know what is?
Li Chen continued: "The phenomenon of so-called hot ice, the ice is in fact not too saturated sodium acetate solution, after being subjected to certain stimuli, too much solute will be down from the top to form diamond crystals looks like ice, but in fact. experience crystal emits heat, so called hot ice.
The supersaturated solution of sodium acetate, looks like water, is not water. Its interior is in a metastable state. If the contaminated solution in the sodium acetate trihydrate crystals will break the balance, so that rapid crystallization of solute excited. Invested in the supersaturated solution of sodium acetate crystals, which crystals will become a 'seed' thus becoming the media, through the guide to break the equilibrium saturation, the reduction process to the whole crystallization. You water becomes ice is not a test, but a supersaturated solution of sodium acetate, sodium acetate reduced to test crystallization. "
Qideng Ming this time has been stunned, unable to speak, pestle extremely embarrassed there.
But this time, there is a chemistry teacher asked the question: "Li Zhen, I do not agree with your statement that extensive use of sodium acetate, sodium acetate, so we experiment a lot of you say that this is sodium acetate solution, however. we will also have before crystallization of sodium acetate and water mixed together, then why did not crystallize it? "
Li Chen smiled and said: "Teacher, if sodium acetate and water are mixed together is a supersaturated solution, that this is too simple."
The teacher asked: "What do you say why we have not now why it can crystallize it??"
Li Chen: "Because you want to make a crystalline sodium acetate, wherein the first step is the step some water ratio of sodium acetate 1.3; state 1, then these water soluble sodium acetate solution was heated to boiling. state, about 8o-95 degrees. stirring was continued during the heating, until complete crystallization of fused sodium acetate in water. the solution was heated until the surface of sodium acetate, followed by forming a thin film, and then allowed to cool, this can called supersaturated solution of sodium acetate. "
Everyone turned to look at Qideng Ming, asked:
"What is this?"
"Really heating ah?"
"Heating also stir?"
"......"
Qideng Ming smile a cry, for Baoquan Li Chen bowed: "Li Shih!"
'Wow -'
The crowd rose up, really.
After "Yes, I did the experiment, when a sudden whim, if the sodium acetate solution boil what would be the phenomenon was heated and then I will, I cook boil boiling solution containing cooling: This Qideng Ming said. want to move somewhere else. but a little tremor, which was accidentally spilled on the sodium acetate crystal on the table, that the water was spilled out, oh no, a supersaturated solution. icy spot on the table the ...... is a chance, I would now such a phenomenon.
I would have wanted to challenge the Li knowledge with this phenomenon, by the way also wanted to get attention,The announcement went out this phenomenon. But I did not think ...... the Li know everything, I stumbled upon the phenomenon now, I do not understand is why the phenomenon, he was able to hit the nail. admire. "
Then, Qideng Ming Li Chen bowed again.
People can not help goose bumps are out, very frustrating.
Science, what is science?
Not that in a time of trial and error, the occasional result of it?
Qideng Ming is a representative, sudden whim, accidental current.
Occasional trembling of the hands, the solution spilled out, accidentally spilled on the table of sticky crystals, incidental achievements of the hot ice phenomenon.
Science is accidental in constant trial and error, constantly arise.
Li Chen also facing Qideng Ming bowed: "Let's seniors can now this phenomenon is God's blessing, we should respect each harbor a man of science and I admire the spirit of bold hypothesis together seniors, as well as the spirit of trial and error.."
Qideng Ming smile soon, very frustrating, for a time did not know what to say.
Among the scene silence, Xu Shen school suddenly opening:. "Li Zhen you just said, there are other ways to make water freeze or real ice??"
His remark, the scene even more silence. Everyone turned to look to the Li Zhen, eyes looking forward.
Li Chen nodded: "There are many ways to be able to let the water freeze.."
Xu Shen school came over excitedly: "You talk about fast ah."
Li Zhen questions for others, never to hide anything, spoke bluntly in power: "There are ice ammonium nitrate, calcium nitrate, ammonium chloride icing way."
"There are actually so many icy way?"
"Is this true?"
"Ammonium nitrate is what ah?"
"The original water without waiting for winter ice ah, the original artificial ice can be?"
"The man is too Guards, and this is the Guards move ah."
"......"
Li Zhen lightly said: "I wanted to let the water freeze, then you need to know the characteristics of the water in the water under 1 atm, of less than o, will reach the freezing point of water at freezing point, there is a. settled crystal molecules, which can call the 'seed' then becomes a medium fast infect other water molecules at the same temperature. freezes to form a large area, which is water, one of the three forms of water vapor ice ice characteristics. "
A chemistry teacher stood up, excited to tremble: "And then freezes then how??"
"In an example ammonium nitrate having a property: water absorption, caking, endothermic characteristic point of water ice, we can take the properties of ammonium nitrate is endothermic with such a large pan ...... laboratory. there are no ammonium nitrate? I field test. "
"What Ammonium nitrate is?"
Chemistry teacher asked a weak weak.
Li Zhen, a film forehead, fills forgotten. University of revival does not yet have the ability to prepare ammonium nitrate. Without him, the main structure of ammonium nitrate, there are ammonia, and ammonia need to be prepared at state high pressure, high fever, universities revival Buyer No device can achieve high pressure. After then, there is no technology to extract ammonia, because ammonia is highly toxic and difficult to extract.
"That way, we can replace the use of ammonium nitrate saltpeter. At a certain temperature, saltpeter can also have a chance to let the water freeze."
After listening to Li Chen said Xu Shen learn quickly hopping: "Quick, find saltpeter!"
"Saltpeter."
"Come on, go and take saltpeter."
"......"
A pass one stood behind to watch the students go out into the Batui go for a run, go saltpeter everywhere. We enthusiasm for science is extremely high.
Not ten minutes, someone came to take what Li Chen want to use.
A large pan, bag of saltpeter, a beaker.
Li Chen, first in large bowl filled with water, and then poured into the pot all saltpeter, will stick to a Qideng Ming:. "Mix water and saltpeter, will fully absorb the heat of the water."
Qideng Ming shocked and said: "? Is it ...... so stir this pot will freeze."
Li Zhen smile loudly: "Nature does not."
Turned around to see the students: "I need a glass of water into the deep water now outdoor room temperature, all with a high temperature weather reasons, need a long time to achieve and in the deep water, heat loss. larger, lower temperature, more suitable for the fast completion of this trial. "
"Go, get well water!"
"To most of the ice well water!"
"......"
There are small groups of students went to the spot on the well.
"To most of the ice well water?"
"In fact, the closer to the bottom of the well water is more ice. This is the well water surface, affected by the weather, it is still relatively high."
"So, you hang me down, I drill into the bottom of the well to fetch water from deep wells."
"be careful,"
A student on the spot off his shirtless, tied a rope around his waist, holding a bottle with a cap slowly climbed down.
'Plop' jumped into the small wells, hidden inside. To the deepest bottom away.
He was surrounded with students buzzing about the Li Chen.
Wait approximately two minutes, the well not the slightest movement, according to some students down with a flashlight, but quiet.
"Students!"
"Quick, pull out!"
"Get him out."
"It was quite deep, he had not drowned out extraordinary accident:.."
"Oh, the rope broke!"
"Ah! Quick shout rescue."
"How to do, how to do this?"
"......"
While everybody was scared Wow, the 'pop' is heard, the well had happened.
Everyone quickly lie in the past and looked inside, surprised to find that students face Guangzhebangzi drops of water, keep the big mouth and breathing heavily. See concern wellhead people look to themselves, hey giggle loudly, proud raised his hands to tighten the bottle cap:
"I get to the very ice!"
"I quickly pulled up, quickly put cold water sent in the past, or will be destroyed ice water at room temperature. I want to see the experiment."
"......"
Everyone looked at the bottom of the well to climb up that smirk students, silence.
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