psychochemist

Chapter 43 Brown Bread

Dean Wu carefully cleaned up the table for the last experiment, and said to the students: "I came to class today, and saw several students enter the classroom by stepping on the bell. It seems that they went to eat chicken last night, right?"

After that, the students in the audience burst out laughing.

Dean Wu went on to say: "Although eating chicken is good, it's not enough to fill you up. Hey? Why does this rhyme with me, a double rhyme."

The students in the audience laughed even louder.Although this Dean Wu is old, he is not outdated at all, and he is also very humorous. It seems that there is a reason why students like to take his class.

Dean Wu said again: "I just want to ask, you are so tight on time, do you have time to have breakfast? Come, let me take a look, raise your hand if you haven't had breakfast."

The students in the audience raised their hands one after another, many of them.Dean Wu: "Raise it higher, are you so hungry that you don't even have the energy to raise your hand?"

The hands of the students were raised higher, even one-third of them!

Dean Wu shook his head helplessly: "Okay, put it down, it seems that you don't understand the importance of breakfast at all. Let me tell you a story about my childhood."

When the students heard that Dean Wu was going to tell a story, they changed their sitting positions and became more curious and serious.

Dean Wu raised his head and began to recall, "When we were young, our family was in the village. Although our family was not rich, eating was never a problem. For a while, I had a problem, that is, I didn't like breakfast. I didn't want to eat anything, I just wanted to play. No one could control me until one day my grandma told me something."

The eyes of the students widened even more, and Dean Wu began to imitate the voice of the old grandma: "Grandson, grandma will tell you a story. It is in the east of our village. There is a little ghost who is about your age in Old Wang's house, and he is also like you. Same, doesn’t like breakfast, guess what happened to him in the end?”

Dean Wu recovered his voice: "Huh? What's wrong?"

Dean Wu imitated his grandmother again: "The child died after a while!"

Speaking of this, Dean Wu paused for a moment, and the students were also shocked. There was no sound of opium under the podium, and everyone felt suddenly saddened by this tragic story.

Dean Wu said very seriously and sadly: "I was terrified and shocked at the time. Judging from grandma's serious expression, she didn't lie to me, and I never skipped breakfast again. This matter is my responsibility." The shadow of childhood that cannot be erased."

The audience was still quiet, and the atmosphere reached freezing point.

Dean Wu sighed sadly, but continued with a ghostly smile on his face: "But who would have thought that this was just the beginning of my childhood tragedy, and later my grandma would tell me stories whenever I was mischievous." When I was naughty and threw things on the ground, my grandma would tell me that there was a kid about my age in the west of the village who also threw things around every day, and then died after a short time. Later, I lied once, and my grandma told me In the east of the village, there was a child about my age who lied every day and died not long after. There was another child who died not long after eating snacks every day..." It seems that Grandma Wu's "death The story of "children" is intentionally made up to be scary, haha.

Before Dean Wu finished speaking, his cold humor caused the students in the audience to burst into laughter.Even Chen Jianyang outside laughed: "This old naughty boy is so cute. At the beginning, I f*ck thought the story was true."

Dean Wu paused, and said with a puzzled expression: "Later, when I was a little older, I asked grandma, grandma, the fellow children in our village are so miserable, they died when nothing happened, and dozens of children have died over the years. gone."

The students laughed even harder.Dean Wu imitated his grandmother again: "Grandson, don't care about these details. So you have to study hard and be obedient. Live hard and become a pillar of our village in the future."

Dean Wu told jokes in a serious manner, which made everyone laugh.

Dean Wu made another gesture to make everyone quiet, and said solemnly: "Okay, what I mean by saying so much is actually to express how important it is to have breakfast."

Dean Wu continued with a smile on his face: "The day's plan is in the morning. Skipping breakfast will not only make you uncomfortable. A new German study found that breakfast not only affects people's physiological conditions for the day, but also affects People's emotions. Breakfast can provide the brain with the energy and nutrients needed to synthesize neurotransmitters. Proteins, carbohydrates and fats from breakfast meat can also affect mood. That is, if you skip breakfast, your mood is likely to Explosions will transmit negative emotions to more people. So for yourself and for the friends around you, please get up 10 minutes early every day and have breakfast. And for those children who are about the same age as you, let them stop for no reason 'Dead'."

There was laughter again from the audience, and every word of Dean Wu seemed to be telling a joke.

Dean Wu went on to say: "But since you haven't eaten breakfast today, I'll change some black bread for you to satisfy your hunger."

When the students heard that Dean Wu was playing tricks again, they concentrated their attention even more.

Dean Wu took an empty beaker, poured half a cup of white solid into the empty beaker, then took another reagent, opened the lid, and slowly poured liquid into the beaker, stirring while pouring.

Something miraculous happened, the white solid inside gradually turned black and began to swell.The students in the audience discussed in surprise.The swelling gradually surpassed the beaker, and accompanied by the faint white smoke, the black swelling continued to "grow", just like a black bread that was getting longer. Gradually, the black bread had exceeded the capacity of three beakers. In height, it has grown more than ten times from a small white solid.

Chen Xingyang watched with relish, and Yu Fan smiled: "It really is a black bread experiment."

Chen Xiangyang joked: "Old Yu, why do you know everything?"

Yu Fan: "I just know."

The growth of the bread gradually stopped, and Dean Wu began to speak again: "Which classmate dares to come up and eat this bread?"

The students shook their heads one after another.

Dean Wu: "That's right, this bread can't be eaten. The white granular solid I poured is white sugar, and the liquid I poured next is concentrated sulfuric acid. Concentrated sulfuric acid, as everyone knows, is not only acidic and corrosive. Another important property is dehydration, which is the property that the hydrogen and oxygen in the substance can be forcibly removed according to the atomic number ratio of 2:1. One mole of white sugar (sucrose) is dehydrated to generate twelve moles of carbon and Eleven moles of water, followed by one mole of carbon and two moles of concentrated sulfuric acid produce one mole of carbon dioxide, two moles of sulfur dioxide, and two moles of water. A black rod-like substance 'grows' out of the beaker, which is black carbon .”

The students took notes carefully.

Professor Wu continued: "Today we will discuss the application of industrial dehydration performance."

After the wonderful opening remarks, Professor Wu began to enter the topic of the lecture.

Yu Fan admires Professor Wu very much. One is his rigorous professional attitude, the other is his humorous style, and the third is that Dean Wu has been sticking to what many university professors are losing—the original heart.

　The bitterness and sweetness of coffee do not lie in how to stir it, but in whether to add sugar—concentrated sulfuric acid
　　
　
(End of this chapter)