Wonderful experimental composition 1 In class, Mr. Wang introduced us to a fun and interesting scientific experiment. As soon as school was over, I couldn't wait to go home and invite my mother to do this experiment with me-the eggs floated.
At first, I found a glass bowl, edible salt, a pair of chopsticks and two eggs. I first poured half the water into the glass bowl, then gently picked up the eggs and put them into the water carefully. I saw the eggs in the clear water lying quietly at the bottom of the water like babies, sleeping soundly. I'm so excited now, I'm going to float!
First, I poured a lot of edible salt into a glass container filled with water and eggs, and found that all the salt sank to the bottom like sand. I wonder: why can't eggs surface after adding salt?
Secondly, I poured the salt in and stirred it until it was salty. When stirring, the two eggs spin gracefully with the water waves like ballerinas. After many times of stirring, with the melting of salt, the egg finally showed half its head on the water.
Finally, I continued to stir and added a lot of salt. At this time, the water has turned beige. Suddenly, I found that the egg had completely floated to the surface of the water, as if by magic. But I still want to know why the eggs float. I took this question to check the information, and then I knew that if salt was added to clean water, the density of water would gradually increase and the buoyancy would gradually increase. When the specific gravity of water exceeds that of eggs, eggs will not sink, which is the so-called "buoyancy principle".
I gained a lot through this experiment. Come and try it quickly!
Wonderful experimental composition 2 I remember one time, I saw something in a book that aroused my interest: a botanist picked two leaves, and he was particularly concerned about one leaf and often encouraged it not to wither; Turn a blind eye to another leaf. A few days later, the leaf that is often encouraged is still green, while the other leaf has lost its vitality ... Will plants understand what humans say? I became interested in this matter and decided to do an experiment.
On the same day, I found two mung bean seeds and planted them. A few days later, they germinated and looked alike. So, I decided to start trying that method!
I smiled at one of the mung bean sprouts and said, "You look really good! It looks much better than the mung bean sprouts next to it! " After that, I looked at the mung bean sprouts with appreciation. I have been doing this for the next few days. Unexpectedly, the longer the mung bean sprouts I admire every day, the better! Another mung bean sprout slowly withered. ...
Seeing this scene, I thought: plants can really understand human words, but why? I looked it up online with questions, but I didn't expect: the answers are strange, and some answers are not scientific at all! It seems that the question "why plants can understand human words" still depends on future generations to explore!
Wonderful experimental composition 3 We set the container, set the iPad and began to wait patiently. Two hours later, crystals the size of ice cream fragments appeared under the small bowl. By the eighth hour or so, a small piece of moss appeared on the wall of the small bowl, which may be very different from other places. It began to grow wildly until its long nutrition (solution) could not reach its end, and the end showed little white hair, and it stopped growing.
When the experiment went on for the thirtieth hour, a small branch of cauliflower at the other end of the small bowl was folded into the water because it was too heavy, so that its water absorption speed would be faster, and the cauliflower would bloom and grow wildly for two hours. Finally, all the nutrients in the bowl were sucked dry, and all the crystals stopped growing.
Because we didn't know what was in the crystal, we asked one of my father's chemistry classmates, the atom teacher. She said it might be copper carbonate according to the color. To verify, she asked us to burn nutritious water to see if the flame reaction was green. Try again whether the nutritious water and vinegar will bubble together. We did so, and the experimental results showed that the flame reaction was green, indicating that there was copper in the crystal composition, but the vinegar did not bubble when the nutrients were dissolved in water, indicating that there was no carbonate. We told the atomic teacher about the experimental phenomenon, and she said that she couldn't guess it, and there was no equipment for measuring crystal composition at home.
Collect cauliflower and dissolve it next time. Maybe it still works.
Careful observation shows that different positions of cauliflower have different colors and shapes. The orchid by the window is small, but it feels stronger. On the other hand, it grows very fast, and the crystal particles are very long, turquoise and fragile, and are often crushed by their own weight. In addition, it is found that the crystal will climb on the windowsill (artificial marble) and the surface of scraping paper, but not on the surface of small clocks (paint).
When my mother and I have a cold and cough, we often use cupping therapy. I watched it several times when my mother held it. The therapist first put a pile of transparent glass jars, large and small, on the bed where mother was lying, then held a cotton ball with tweezers, soaked it in alcohol, and then lit the wet cotton ball with a lighter. Finally, she stirred the cotton balls in the glass jar several times and quickly put the jar mask on the corresponding acupoints. At this time, the glass jar is still warm to the touch, and sometimes there will be doubts in my heart: how can the glass jar not fall off just like sticking to the skin? Why does the skin on the mouth of a glass jar bulge like a balloon?
This week, the teacher arranged for the students to go back to do experiments. I did several experiments. Among them, my father chose a simple experiment "hanging a bottle by hand" from the book "Science Games Fascinating Children" to do together. We found an empty bottle full of jam. I pour hot water into the bottle first, and then shake the bottle to pour it out. Then I quickly put my palm on the bottle mouth and held the bottom of the bottle with my other hand. Dad turned on the cold water and washed the bottle. Finally, when the bottle cooled down, I let go of the hand holding the bottom of the bottle. The palm of your hand covering the bottle mouth actually firmly absorbed the bottle, and the bottle hung under the palm of your hand. "Why is the bottle hanging under your palm?" My heart is full of questions.
Dad explained to me that the principle of the above experiment is the same as cupping. Then, my parents told me about the composition of air, heat expansion and cold contraction, atmospheric pressure and other knowledge. It turned out that the glass bottle was pressed on the palm and skin by atmospheric pressure, and the bulging skin in the bottle was sucked up by the negative atmospheric pressure in the bottle.
By doing small scientific experiments, observing and reviewing interesting phenomena in life and looking for answers with questions, I learned a lot of scientific knowledge.
Wonderful experimental composition 5 Saturday morning, the sun is shining and the spring breeze is warm. I went to the kitchen to do the experiment as soon as I got up.
I prepared two oval eggs, two transparent glasses, a long wooden chopsticks, some salt and a spoon.
The preparatory work is completed and the experiment begins. I took half a glass of water with a glass first. I put four tablespoons of salt in one of the cups and gently stirred it with chopsticks. The salt became less and less and finally disappeared without a trace. I was puzzled and asked my father curiously, "What is this?" My father told me, "Salt is soluble in water." I suddenly realized.
I put a raw egg in a glass without salt. The egg kept sinking and refused to get up again, like a sleepy child. I put another egg in a glass with salt. I saw the eggs in the glass sink slowly first. Suddenly, it floated again. I can't believe my eyes. I gently pressed the egg with my hand and it floated again. Wow! It's incredible. Is it because the eggs are light that they float? I put a big egg in the water, but it still floats. I asked my father in surprise. Dad said, "It's all because of salt. The density of salty water is high, and the buoyancy of water increases, so the eggs float and will not sink. " I jumped three feet. Oh, I see.
In this experiment, I got happiness and learned knowledge, killing two birds with one stone.
Wonderful experimental composition 6 "Let's go this way ……", robot teacher Xiao Q led us to the 3D virtual reality laboratory of the school. I saw that it aimed at the QR code on the door with a code scanner, and the door of the laboratory opened with a bang.
The students stood on the "suspended independent car" and entered the laboratory one after another. "ah!" Everyone was amazed at what they saw. This is the "pressure buoyancy cabin", which will change the pressure and buoyancy from time to time, and there will be many animals beside it. Because the pressure and buoyancy are constantly changing, several students are pulled into a circle, just like on a trampoline, which is really interesting.
Before I had enough experience, I heard Miss Q say in a rhythmic voice, "Let's go to the lab next door!" After that, the students took the "suspended independent car" to the second laboratory-the pirate ship laboratory.
The "Pirate Ship Laboratory" allows students to experience real life at sea. After the students stood on the boat, the boat began to shake. The glistening ground turned into a blue "sea", and several students gradually got seasick. Miss Q came to the bow and said, "This cannon was built by Napoleon in 1793. It weighs 50 kilograms and is 2 meters long. 5 meters, half a meter high, was the most powerful weapon at that time. " The students came to miss q in surprise. In a blink of an eye, we entered the era of Napoleon's naval battle. ...
Teacher Xiao Q said, "Because time is limited, I can only study in these two laboratories today, and I will go to other laboratories in the future." It was noon in a blink of an eye. We had lunch on the 3D boat, and then school was over.
Learning in the 3D lab is very happy, with vivid pictures and experiences, and all-round robots to help us. How wonderful the future study is!
Wonderful experimental composition 7 In class today, Mr. Chen came into the classroom with a big smile on his face, holding a bowl in his left hand and a candle and lighter in his right hand. Students are like monks in Zhang Er-scratching their heads and discussing what teachers do with these things.
Teacher Chen looked at our puzzled eyes and said, "Students, let's do an experiment today." As soon as the words were finished, the students began to make noise. What is the teacher going to do?
At the beginning of the experiment, some students stood on chairs, some knelt on the table, and some squatted down to observe carefully. I saw that the teacher first lit the oil at the bottom of the candle with a lighter, connected the bowl with the bottom of the candle, then poured water into it and finally lit the candle. One by one, the students opened their eyes, held their breath, craned their necks and seriously enjoyed the dancing flames. The teacher was so quiet that he could hear a pin drop, for fear of making a noise to scare the fire away.
After a while, the candle burned as high as water, and the flame was still jumping happily. After another five minutes, the candle in the fire bar was hollowed out, but the fire still didn't go out. Why? I carefully observed that the flame burned in the water, but there was a protective film around the flame. I have a few questions: How did the protective film of the candle form when it caught fire in the middle? How can water not burn? With questions, I had a heated discussion with my classmates. Finally, Teacher Chen solved the mystery for us.
After finishing this experiment, I benefited a lot, not only knowing this truth, but also understanding that as long as I do more work and think more, I will make many new discoveries.
Water is the source of life, and at the same time, it is also the king of diet!
In the composition class, the teacher did an experiment about water. In front of the teacher, there is a kettle and a water cup. The teacher filled the glass with water and dropped a paper clip. The paper clip shook his body gently, breaking the peace of the water. Immediately, the paper clip fell into the bottom of the cup playfully. The teacher put some paper clips, one, two, three ... The cup was filled with 50 paper clips at once, but the water level only rose a little. I think: there should be 100 paper clips! The classmate next to him shouted excitedly, "Go on, go on!" "
Then, the teacher began to put paper clips. As the number of paper clips in the cup increased, everyone held their breath. Only the sound of the teacher counting echoed in the classroom, and the water level soon rose by another millimeter. The teacher didn't stop putting paper clips, and the paper clips swam around in the water one by one with the count. My heart hangs in my throat. "150!" After 150, the water didn't overflow, like a big stomach king, and the appetite was getting bigger and bigger.
With the passage of time, the number of paper clips in the water quickly reached 198, and the 200th paper clip in the teacher's hand fell into the water. Miraculously, the water still didn't overflow! It turns out that in water, there are gaps between water molecules, and the paper clip occupies the position of the gap, so the water will not overflow.
Looking at this glass of water in front of me, I can't help but sigh: water is the king of big stomachs!
Wonderful experimental composition 9 students sometimes sit up, sometimes stare big eyes, and sometimes around the table. Hey, what are they doing? It turns out that they are doing experiments!
The experimental talent show competition has finally started! Laozi and Zhuangzi took the lead. I saw her take out the paint box, cut the milk, pour it on the plate, grind the paint into water and drop a few drops on the milk. She took out a cotton swab, opened a small box next to it and sucked a few drops of detergent into it. Finally, like a dragonfly, a little bit on the paint. In the blink of an eye, the pigment generalized into a circle and quickly spread around the plate. This stunt function is amazing! Lao Tzu and Zhuangzi are so talented!
Number two "Tao Qi Bao" is on the stage. I saw him take out a bottle and put a balloon at the mouth of the bottle. As soon as he blows, the balloon won't blow up. However, he picked up the scissors and cut a small hole in the middle and lower part of the bottle mouth. He blew on the balloon again and it exploded. I think: it's probably the air. He blew it up again, but he stuck it with plastic glue and the balloon stopped blowing at once. Once loose, it blew again. Everything is under his control!
There are old Huang's books that have gone and never returned, Xiao Wan's books that have been pulled out, and Timmy of Afeng. ...
Finally, it was my turn. I first tore a piece of paper, put it on the cup, put the blackboard eraser on it, and when it fell, I folded the paper n times, put it on the quilt and put the blackboard on it. Hey, why did it collapse again? I folded the paper in half several times, one frame and one release, yes, it worked. Everyone must be thinking: how is it possible? You can't do it flat, but you can do it curved. If I do this, they can borrow from each other, that's all.
Through the small seed class tonight, I understand: science is beautiful!
Wonderful experimental composition 10 It is reported that a wonderful laboratory has appeared in China. The local people say that this laboratory can simulate the environment during the dinosaur period, simulate the moment when butterflies fly to your eyes, and explore the internal structure of atoms. This report immediately activated the curious cells in my body. Under the guidance of curiosity, I decided to go to this laboratory to find out.
I used my spare time to buy a plane ticket to a place with that laboratory. After a long flight in the sky, I finally reached my destination. As soon as I got off the plane and the airport, I couldn't wait to run to the lab.
When I walked into the lab outside, I couldn't help but stare big eyes. Oh, my God! Is this a laboratory? Not at all! This magnificent appearance, that noble red column, plus this, is clearly a court!
I opened the door with a grain of salt and felt my five views do it one brace up! All kinds of machines and manuals, some of which are thicker than dictionaries. Fortunately, there are names and uses around them, so I don't need to look at them again and I don't know their uses. Now I'm just looking for the machine in that report.
Many things have happened, and I finally found it. I operate the machine according to the manual. Finally, I saw the vast grassland covered by the roar of dinosaurs: I seemed to become a quantum, entered the atom and saw the wonderful distribution inside the atom.
This harvest was very rich, which made me realize the living environment and habits of dinosaurs and the internal structure of atoms.
Wonderful experimental composition 1 1 When I came to the classroom, I found that my classmates had been sitting straight and staring at the teacher. Teacher Ye is holding a blank sheet of paper, tearing it to pieces and hissing like a snake.
What is the teacher going to do? Why did you tear the paper to pieces? Just as I was wondering, the teacher took out scissors and cut the paper smaller. Then the teacher gave us a plastic pen to wipe on our heads, saying that we could suck these little pieces of paper in the future. Although I didn't believe it, I saw my classmates rubbing hard, and I also picked up a pen and began to wipe.
The students rushed to the table in front of the podium and began to suck scraps of paper. Some students put the pen at the end of the paper, and the little piece of paper was indifferent, so they lay motionless on the table casually, as if proudly saying, "What do you do with me?" ; Some students didn't touch the scraps of paper, but the scraps of paper actually flew to the end of the pen by themselves, as if attracted by a magnet, and could not fall down at all; Some students just put a piece of paper at the end of the pen and dropped it at once, showing his dejected appearance.
I felt that my pen was getting hotter and hotter, so I quickly ran to the small table and put the nib I had just wiped on the paper. The paper was dancing and spinning on my pen like an elf, but before a second, it fell down again. I'm a little disappointed!
Why can a wiped plastic pen absorb small pieces of paper? The teacher told us: "It's static electricity. For example, sometimes when two people are holding hands, they will get an electric shock, and sometimes when they take off their clothes in winter, they will emit lightning ... "
In this class, although I didn't suck a piece of paper, I was still very happy because I witnessed the success of others' experiments.
Wonderful experimental composition 12 students, what do you think of a wonderful laboratory? Is it wonderful? Where is this wonderful laboratory? Next, let me tell you! Don't be intimidated when you listen!
This wonderful laboratory is like a computer. It also has the magical function of computer. This is a great laboratory. People put it in a mysterious basement. When they walked in, they saw a laboratory. When they walked in, they walked into the palace. It is resplendent and magnificent. It can also shuttle to other places and go wherever it wants. There is no need to fly or train at all. For example, in the dinosaur era, we saw the fierce Tyrannosaurus Rex. There are many kinds of Tyrannosaurus Rex, such as Feather King, Tyrannosaurus Rex, and many flying animals. They spread their wings and galloped, often hunting every morning, and triceratops. It worked hard and fought to the death with Tyrannosaurus Rex. Among dinosaurs, rhinoceros dinosaurs run fastest. They often hold dinosaur races. Look at the horns on its head and the scales on its body. Soon. If it is hungry, it often eats fish smaller than itself. Its teeth are so sharp that it can eat tens of thousands of fish in one bite. In the ocean, the whole ocean is ruled by it alone. Among them, some dinosaurs living on land are not its opponents alone, even the most powerful Tyrannosaurus Rex can't beat it, because its sharp teeth are poisonous, and once bitten, it will fall to the ground immediately.
Students, do you know why I have so much knowledge? That's because it's all from that magical laboratory, and its function is really great!
Wonderful experimental composition 13 "Ding" The bell of our favorite science class rang and the teacher gave us a wonderful experiment. The name of this experiment is "Rainbow Appears". I think: rainbows only appear after rain, and there is no rain now. How did the rainbow appear?
The science teacher brought the equipment needed for the experiment: a prism and a sprayer.
At the beginning of the class, the teacher first asked, "What are the seven colors of the rainbow?" Xiao Liu said, "It's red, orange, yellow, green, cyan, blue and purple." The teacher shook and invited Zhu Xiao. Zhu Xiao said, "It's red, orange, yellow, green, cyan, blue and purple." The teacher said, "No, it should be' red, orange, yellow, green, blue, indigo and purple'." Then the teacher smiled and said, "Students, is there any color you don't understand?" I raised my hand and said, "Teacher, what color is indigo?" I think I spoke the thoughts of the whole class. Before I thought it over, the teacher said, "It must be a combination of blue and purple." I see, the whole class understands. The teacher began to do the experiment. She took the prism to the sunny window and put it in a sunny place, then let us look at the wall. When we saw it, we shouted in unison: "Wow!" A rainbow appeared on the wall. The teacher said, "This is the principle of' light refraction' that we learned last class." The teacher picked up the sprayer again, turned his back on the sun and sprayed it obliquely. We saw a rainbow in the hazy drizzle. It's amazing. The teacher said, "rainbows are formed because water droplets scatter sunlight." Do you understand? " "I see!" We have finished this course. The bell rang.
What a wonderful experiment this is!
Although this class is over, all the students feel very fresh.
Wonderful experimental composition 14 one night, I lay in bed and thought, "if only our school could have a laboratory, there should be a lot of scientific knowledge or mysteries waiting for us to explore!" " Thinking about it, I didn't have much time, so I fell asleep and slept beautifully. I dreamed that:
A fresh morning came, "Ding Rinrin Ding Rinrin ~ Ding Rinrin Ding Rinrin ~" This is the sound of an alarm clock, which is in the shape of a small snail. It woke us up. I lay in the dormitory of the school and opened my blurred eyes. My roommate greeted me, and a new day began!
This is my first day in experimental primary school. I walked into the experimental class with my schoolbag on my back. This is our first class on the first day. It is led by our head teacher, Miss Liu. The teacher introduced the instruments on the desk. This is a stargazing mirror, which shows us how to look at the stars with a stargazing mirror at night. You also taught us how to distinguish planes from stars. Don't think that stars and planes are easy to recognize. It seems that everything you learn will suffer! The bell rang and we were dismissed.
After class, we visited the art gallery, museum, library and viewing building ... The class was about to begin, so we rushed into the classroom.
"Get up! Get up! Late for school! " As soon as I opened my eyes, I shouted, "Where is the laboratory?" I knew it was a dream!
Wonderful experimental composition 15 Our school has a wonderful laboratory where we can study, relax and have fun. There are no teachers, only two machines. The first machine is a learning machine, and the second machine is a time machine, which can let us go back to the past and cross into ancient times or wartime. Let's reflect on the interest of life.
I'm standing in front of the time machine, and we can choose a time to travel. I chose j ancient times. With a harsh voice, I traveled to ancient times, wearing red Hanfu and ancient heavy makeup. I am in a palace with a little girl waiting for me. The little girl has big eyes, rosy lips, long hair and purple Hanfu. There are four rooms in the palace. Facing north is my room, facing south is the kitchen, and facing east is where I put many Chinese clothes, shoes and hair accessories. Facing west is the gate, and there is a small flower pond in the middle, where lotus flowers and Zi Xuan flowers are planted. You can smell the delicious fragrance when you go out. There is an invisible door in my closet, which is my secret base. All my possessions and jewels are here. Through this invisible door, there is an iron gate. Through this door, it is the last door. This door is so strange that only I can open it. If it weren't for me, others would be electrocuted, because then my things wouldn't be stolen. In this way, I spent an ancient day and returned to modern times.
I choose to cross the war again. Boom-boom cannons came one after another. I'm holding a gun at this time, and we're fighting the Japanese. The scene was terrible, so I quickly crossed into modern times.
I hope our school can have such a great laboratory!