There is another interesting chemistry class in the new semester, because of those interesting chemistry experiments and even more because of the humorous teacher Guo.
Compared with other teachers, Mr. Guo's appearance is not young, but he does not have a "steady" demeanor consistent with his age. His words and deeds give people a childish feeling, lively and interesting.
I remember in a chemistry class, Teacher Guo talked about the valence of common elements. The first time I saw those lines of elemental valence, I thought, ah, what is this! I've seen it elsewhere, but it's all sentences with slight melody. Can you still tell the difference between flowers? Seeing that Mr. Guo was in no hurry, he gently pushed his black-rimmed glasses with his hand, and then began to tell a story: "The silver in the first sentence" monovalent ammonium, sodium, potassium and silver "means" human "in some local dialects, and" ammonium "means" an ",so this sentence is" I invite that silver "and I invite that family to dinner. The voice just fell and the classroom burst into laughter. Teacher Guo immediately said half jokingly, "Of course, if you don't want to invite others, you can also write' That bank invited me'." Laughter broke out again and flooded the whole class. It's really a wave of unrest, and it's happening again and again. Some students' smiles are confiscated, and they can't laugh any more. They laugh so hard that their foreheads sweat and cry for you. Teacher Guo paused and gave us a short breath. The story continued: "The second sentence is' bivalent calcium, barium, magnesium and zinc oxide'. If you eat a sheep and it doesn't have a vest, it is' the sheep doesn't have a vest'." "Ha ha ha ha ..." This is another hilarious shock. Some people were out of breath, but Mr. Guo kept a straight face: "Next sentence ..." Mr. Guo continued to use his cadence to magically adapt those boring sentences into a ups and downs story, starting with inviting people to dinner. The bizarre plot makes people laugh. In this story and laughter, we remembered the valence of these elements and deeply realized the essence of "entertaining through education".
Since then, when I use these valences in my chemistry homework, I always recall the somewhat confusing eating story. That wonderful chemistry class, the teacher's energetic little gestures, vivid tone and those valence are deeply left in my memory.
Just like "purple turns red" and "sparks fly" in chemical reactions, Mr. Guo's story is equally colorful.
My chemistry teacher
Zheng Zheng
He is of average height, well-proportioned, wears a pair of glasses that fit his face very well, and wears a suit and tie every day.
He walked into the classroom and shouted, "The fairy is back!" " The students immediately ran around in a hurry, and a dark-skinned classmate even came to an hurdle-across the table.
He stood on the platform and said with a serious expression, "A black lightning flashed in the storm." "Ha ha ha ....." The students understood that he was vividly depicting the fragments in Haiyan, and the face of the students who had just hurdled immediately turned black and red. Looking at the laughing students, he spoke again: "You really have the characters in Journey to the West to meet", paused and said "concentrate". After three seconds of silence, a burst of laughter broke out in the classroom.
He began to lecture, turned his back on us and suddenly shouted, "So-and-so, Mo Moumou, what are you talking about?" Immediately rushed to the last row with lightning speed, and two students went to the front of the classroom and one squatted at the back of the classroom. After that, I began to tour lectures and began to do circular movements in the classroom. Wherever he goes, his spit will splash on the table next to his classmates. Suddenly, he added, "So-and-so, why are you still talking?" It's really' You are at the head of the Yangtze River, I am at the tail of the Yangtze River, and I miss you day and night …' "Ha ha ha ……" The classroom smiled again. Before the students finished laughing, he suddenly knocked on the head of a classmate next to him at a very fast speed and said, "My mouth is watering now, and I will cry in a few months;" I have a dream now and I can have a dream in the future. " The classmate looked up absently and nodded sleepily. And once again, he went to the podium and started that long and boring chemistry topic.
He has a strong sense of time, so we also learn from him. Every time he sits on the podium with his legs crossed and starts reading his abstracts or the filial New Weekly of his classmates, we finish the chemistry test paper at a fantastic speed and give it to him for correction. As for him, it seems that he doesn't want to interrupt his point of view. You can see the score in 2 minutes and go back to his seat to continue purgatory in other fields. How is he?
His greatest hobby is driving a motorcycle, at least we think so. His home is at school, but he insists on riding a motorcycle to and from work every day, rain or shine, and exercises his "body" accurately. Sometimes you can see a little girl in the back seat.
Another feature of him is that he is particularly famous. Search his name in Baidu "Huanggang Middle School Post Bar", and you will see 9 messages after entering, which is also the result of the students' efforts and has created a good public opinion for him.
At the sight of his name, many people, no, almost all of them think that he is a star, and he likes to tell stories about his childhood in class, so my junior high school classmates and I both think that we can write a book called Diary of Wang Xuebing's Growth, which will surely make a bestseller list in China, and the author will definitely make a lot of money and become a millionaire.
2. Urgent, please praise the chemistry teacher's article. Thank you for reading the chemical edition of blue and white porcelain. You worship the chemistry teacher too much.
White flocculent precipitate jumps at the bottom of the test tube, and copper ions will never separate when they meet hydroxyl radicals. When the solution is golden yellow, because potassium iodate is light green, pseudo-ferrous secretly swims to produce acetylene gas, which becomes acetylene flame after being ignited. Carbon dioxide limewater is dotted with white benzene, which is not easy to change color when it meets potassium permanganate. It is not easy to add X to toluene. Note that the iodine molecule of tnt in benzene is purple and beautiful, paving the way for extraction. The electrolyte in the electrolytic cell is charged and polarized. The valence is high and low electron transfer refined copper, iron, zinc, manganese, nickel, chromium, aluminum and tin, leaving anode mud to dilute concentrated sulfuric acid into water drops along the wall of the device, slowly stirring hands to prevent concentrated acid from contacting the skin, immediately washing with plenty of water and applying emergency glycerin of sodium bicarbonate to moisten the skin smooth and delicate, and adding hydrated lime to the soil. The pH value is appropriate. Look at how good the acid red and alkaline purple test paper looks. My eyes are smiling.
3. Urgent, please praise the chemistry teacher's article. Thank you for reading the chemical edition of blue and white porcelain. You worship the chemistry teacher too much.
White flocculent precipitate jumps to the bottom of the test tube.
Copper ions will never separate when they meet hydroxyl groups.
When the solution is golden yellow, because potassium iodate
Light green and fake ferrous iron are fascinating.
Calcium carbide sneaks around to produce acetylene gas.
After ignition, the acetylene flame becomes a high temperature of several thousand degrees.
Evaporating carbon dioxide
Lime water adorns the white sink.
Benzene is not easy to change color when it meets potassium permanganate.
Add x to toluene. Watch out for tnt.
How beautiful the purple color of iodine molecules in benzene is.
This laid the foundation for extraction.
The electrolyte of the electrolytic cell is electrified through the anode and the cathode.
The price is transferred from high and low electrons.
Refining copper, iron, zinc, manganese, nickel, chromium, aluminum and tin.
Leave anode mud
Dilute concentrated sulfuric acid into water droplets
Slowly pour the stirring hand along the wall.
Immediately wash the skin with plenty of water and concentrated acid.
Use sodium bicarbonate for emergency treatment.
Glycerol moisturizes the skin smooth and delicate.
Slaked lime has a proper pH value when it enters the soil.
Look how beautiful the test paper is.
There's a smile in your eyes
4. Write a composition about the chemistry teacher in senior high school at the beginning and end of a good composition. What is a good beginning and end?
Or use poems, such as what: silkworms will weave until they die in spring, and candles will drain the wick every night. Something like this
The ending is about to sublimate.
Write something praising the teacher.
This way, please
I like you.
I believe you can write a satisfactory composition. . = =
This teacher is so troublesome.
It is not good to write about his greatness. . = =
Then use this.
Spring silkworms died, but they left behind luxurious silk; The butterfly died, but left beautiful clothes; Thrushcross flew away, but left a wonderful song; Flowers withered, but left a wisp of fragrance; The candle burned out, but it left a bright light; The thunderstorm passed, but colorful neon lights were left behind.
I wrote this at the beginning, and then wrote at the back: the teacher _ _ _ _ died, but left _ _ _ _.
Then I started writing about teachers.
What's it like?
The impression he gave you.
How interesting is he?
This way, please
5. Just learning chemistry, the teacher asked to write a 600-word composition on chemistry, and the style is not limited. Please remember a vivid junior high school composition in chemistry class. This is our first chemistry class.
A male teacher came in along the road, wearing a suit and tie, and left beautifully. He first looked around the door for a week, and then stood straight in the middle of the meeting, like a model, with his back straight.
The description of appearance highlights the characteristics of the characters. Looking at him as the president of this company, we can't help but blurt out: "Wow!" 323131335323631343130323136353333e58685aeb9313337665438 is very loud.
"class!" The sound was even louder, and our "wow" was shocked back. I stood up slowly one by one, but the teacher kept staring at us without saying a word. Several clever students immediately came to "stand at attention" and followed the whole class.
"Hello, classmate!" We dare not neglect the teacher's 90-degree standard ceremony. We also sent a "gift of touching the table". "This class, let's have a magic lesson.
Hey, don't turn the pages. Don't use books this time, just watch the' performance'. "
After that, he turned to the outside of the classroom and brought in a box full of bottles and colorful medicines. "Look at this."
He took out two empty bottles and shook them. "There is nothing in it." . Then he knocked two bottles together, pulled open the glass between them and heard a bang. The smoke in the bottle rolled up and down like a little dragon making waves inside.
(the metaphor is vivid. After the calm, the bottle was filled with white smoke.
"It's called' making cigarettes with empty bottles'." He said proudly.
"The next program is called" Color-changing Bottle "."He held a glass rod in one hand and a flask containing various reagents in the other, and then held it up for us to see.
"Now it is colorless and transparent. You see, I want to turn it into bright red. " As he spoke, he turned his wrist and the liquid in the bottle turned red.
"It's gold, purple and blue." As he turned again and again, the liquid in the bottle became colorless and transparent.
"Have fun, and you will know the mystery later." Under our gaze, he completed several more "magic tricks".
(Narrative, detailed and vivid description. The bell rang, and in our endless admiration, he walked out of the classroom and suddenly turned back: "My name is X, my name is xx, I remember."
A burst of happy laughter broke out in the classroom Teacher, I can't forget the vivid lesson you gave us.
You have deeply attracted your students with this subject. Now that I graduated from junior high school, I really hope to see your magic again.
(lyrical, showing attachment to the teacher. )。
Speaking of the chemistry teacher's composition, I have to admit that she seems to be like my Korean teacher, with a good temper and personality, and seems to punish people.
I closed my eyes these days and saw it at noon on Thursday. She pointed at me with a pile of paper and shouted at me, "What do you want to draw? Is atomic energy the same as ions? " I didn't know how to do it for the first time, and she also said that the first time I drew the wrong ion was the first time I finished it. She walked away from me and gave it to her. After a while, she came. Then I said that his class meant "you can't hand it in last, just copy it again" and then I was approved, as above.
I'm so wronged, tears are pouring down my face. Why are you pointing at me so strangely? I am ashamed and wronged. I didn't have a rest at noon, and I kept seeing pictures of her scolding me in my mind. Alas, she scolded you at the front table only because she valued you, otherwise she wouldn't care about you. It seems to be right, too She once told me that I did well in class and asked me to predict the accuracy of the problem.
I tell you again, every Friday night when she is studying chemistry, she will ask questions and ask her all the contents of the week. Last time Fangfang made a mistake, the chemistry teacher asked her to copy everything she had learned 10 times. Then, I went to write chemistry all day. This time, the chemistry teacher said that this time I would ask all the contents of Unit 2 and draw the symbols of ions and atoms, plus 20 atoms.
At the beginning of her question, whoever dares to open the book will hit the gun! 20 atoms must be recited twice in one breath. After a pause, it is regarded as not recited. Alas, our class all passed the exam, and then I asked about the content of Unit 2. I'm a little worried. I have studied for a long time and haven't reviewed for a long time. I'm a little scared. When he asked me the previous one, the question was simple, and I almost knew what to ask me next. However, the chemistry teacher stopped asking me that one and turned around. But I just can't remember. When the teacher asked the next one, I remembered it, but my deskmate forgot it. At that time, the chemistry teacher was standing next to me. I shouted, "Teacher, I remember, I remember, I will recite it again." The chemistry teacher said, "You give it to me, take the regret medicine, and I'll let you recite it again." The teacher went on to talk about the next one, the next one. Later, she continued to ask questions. One person in our class didn't speak completely. A boy in front reminded her. As a result, the boy recited all the things in Unit 2 without asking questions. He recited it himself. If there is a mistake, copy it! As a result, the teacher found fault in the egg and the boys copied it wrong. However, those who perform well can earn opportunities, or the arranged things are fine, or they can.
I did it once, so I chose not to copy all the contents of Unit 2. Too much! I can't tell you how much I like her, but I like her smug smile when she catches people. It's so cute, and she would rather let us scold her now than hate her later! What an upright teacher. Generally speaking, is she good for us or supports her?
7. How to write a composition? The chemistry teacher suddenly asked us to write this composition: 1. What is chemistry in my mind? Perhaps in some people's minds, chemistry is a symbol of evil. Perhaps in the eyes of others, chemistry is just a meaningless subject. Of course, in some people's minds, chemistry is a subject that can turn decay into magic. It can turn rubbish into treasure and ugliness into beauty. She is omnipotent, omnipresent and an angel. As for why they have such an idea, I understand it this way. Probably because of the dark side of chemistry I saw when I was a child. At this time, unconsciously, I had a fear of chemistry, a normal scientific subject. I often hook up with an evil wizard for her, thinking that chemistry is a shady conspiracy, but it can't be explained reasonably, and the feeling of fear arises spontaneously. Admittedly, chemistry has its shortcomings, which I don't deny. For example, we use sulfur-containing coal as fuel. It will produce acid fog, corrode the earth and threaten the life and health of living things. For example, some household detergents as suicide tools will lose their original beautiful aura. It is not what we want to see, but also understandable how strange and ugly the original kind and lovely appearance has become in an instant. Is chemistry so useless? I don't think so. Let's look at it from another angle. (The problem is often like this: "The good peaks change everywhere, and the secluded paths are lonely." In another mood, hell is heaven. Because in the process of developing chemistry, human society blindly pursues economic benefits in a special historical period, although it is the harm brought by chemistry, in order to solve this pollution, only by mastering chemical knowledge can chemistry be used to solve this problem. Therefore, we should not look at chemistry too one-sidedly. We might as well look further. The country needs chemistry to develop national defense and ensure our safety. It takes chemistry to make steamed bread and things like that. I don't think we can clean all kinds of things without these detergents now, can we? What would our life be like without chemistry? I can't imagine how primitive it will be. Our chemical level in China has been far ahead since the Warring States Period. If we want to say that we are descendants of the Chinese people, please think about the rich chemical heritage left by our ancestors. Did we inherit it? Don't forget, we haven't won the Nobel Prize yet! This is the mission entrusted to us by history. This is my understanding of chemistry.
8. Asking for a composition "Chemistry I Know" The first chemistry class I know-the first time I took a strange chemistry class, our whole class had to study with many college teachers, and the teacher in class was a strange foreign school teacher. That strange teacher gave us a strange lesson, and I don't know why. It's a little complicated and nervous. A teacher finally finished the introductory class. Then another expert gave us a demonstration experiment class. With laughter, my mood gradually calmed down, and my perceptual knowledge of chemistry made me unconsciously look forward to the next formal chemistry class. My first chemistry class after I entered the chemistry world happily for the first time was given by our chemistry teacher. I find it fresh and interesting. In just 45 minutes, Mr. Liu took us into a wonderful chemical world. Chemistry has brought great development to mankind, which makes me want to learn chemistry well. Chemistry makes the world colorful, and the world of chemistry is really wonderful. I reached an agreement with my classmates that we should study chemistry hard. Our ancestors discovered oil more than 3000 years ago. Shen Kuo's Talk about Meng Xi in Song Dynasty recorded the use of oil for the first time. And predicted: "this thing will be popular all over the world." 1965, China took the lead in synthesizing the active protein-crystalline bovine insulin by artificial method in the world. The Nobel Prize in Chemistry passed by because of its signature. ) In 1970s, China's original cyanide-free electroplating process replaced the toxic cyanide-free electroplating, which was a pioneering work in the world electroplating history. The world sea salt production is 50 million tons. Among them, the output of China is more than10.3 million tons, ranking first in the world. China plays an important role in the history of world chemistry. In a word, we take the most curious and serious attitude towards the first contact object.